26-30 October 2015
Asia/Tokyo timezone
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Gamma-Ray Astrophysics

Date: from 26 Oct 14:00 to 29 Oct 19:00

Conveners

  • 26 Oct 14:00 - 16:00 Extragalactic
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Prof. Funk, Stefan (Universität Erlangen)
    • Dr. Mazin, Daniel (ICRR)
  • 26 Oct 16:30 - 19:00 Extragalactic
    • Gabici, Stefano (APC)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)
  • 27 Oct 14:00 - 16:00 GRBs and experiments
    • Prof. Funk, Stefan (Universität Erlangen)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)
  • 27 Oct 16:30 - 18:45 Diffuse emission, Galactic Center and CR propagation
    • Gabici, Stefano (APC)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)
  • 29 Oct 14:00 - 16:05 Galactic
    • Prof. Funk, Stefan (Universität Erlangen)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)
    • Prof. Funk, Stefan (Universität Erlangen)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)
  • 29 Oct 16:30 - 19:00 Galactic Sources and Future missions
    • Prof. Funk, Stefan (Universität Erlangen)
    • Gabici, Stefano (APC)
    • Dr. mahaya
    • Dr. Mazin, Daniel (ICRR)

Timetable | Contribution List

Displaying 47 contributions out of 47
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi Large Area Telescope (LAT) has been routinely gathering science data since August 2008, surveying the full sky every three hours. The first Fermi-LAT catalog of sources detected above 10 GeV (1FHL) relied on three years of data to characterize the >10 GeV sky. The improved acceptance and point-spread function of the new Pass 8 event reconstruction and classification together with six yea ... More
Presented by Dr. Alberto DOMINGUEZ on 26/10/2015 at 7:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
In the framework of the international Cherenkov Telescope Array (CTA) observatory, the Italian National Institute for Astrophysics (INAF) is developing the ASTRI SST-2M end-to-end prototype, installed at Mt. Etna (Italy) on September 2014, and the ASTRI mini-array, composed by nine ASTRI SST-2M telescopes proposed to be installed at the southern CTA site. The project is also including the full dat ... More
Presented by Dr. Saverio LOMBARDI
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Active galactic nuclei, including blazars, have been considered as cosmic-ray source candidates, and GeV-TeV gamma rays can be used as a powerful probe. I will discuss signatures of secondary gamma rays and their multi-messenger connection.
Presented by Prof. Kohta MURASE on 26/10/2015 at 5:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Rotation-powered pulsars release their rotational energy as relativistic magnetized plasma and create pulsar wind nebulae (PWNe) around them. Although magnetars are considered as magnetically powered pulsar, they also release their rotational energy by the wind. This is obvious from the fact that they are spinning down. We have been detected PWNe around energetic pulsars which have spin-down po ... More
Presented by Dr. Shuta TANAKA on 29/10/2015 at 6:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
When very high-energy photons (VHE, E>100 GeV) propagate over cosmological distances, they interact with background light by pair production. Observations of spectral features in the VHE band of extragalactic sources related to this energy-dependent absorption process with the H.E.S.S. array of Cherenkov telescopes allow measuring the spectral energy distribution (SED) of the extragalactic backgro ... More
Presented by Dr. Fabian SCHÜSSLER on 26/10/2015 at 8:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The gamma-ray energy range from a few hundred keV to a few hundred MeV has remained largely unexplored, mainly due to the challenging nature of the measurements, since the pioneering but limited observations by COMPTEL on the Compton Gamma-Ray Observatory (1991-2000). This energy regime encompasses the transition between thermal and nonthermal processes, and accurate measurements are critical for ... More
Presented by Dr. Jeremy PERKINS on 29/10/2015 at 9:10
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
H.E.S.S. is a hybrid array of five imaging atmospheric Cherenkov telescopes operating in the very-high-energy (VHE) gamma-ray energy range ~20 GeV to 100 TeV. With its unprecedented sensitivity, broad energy range, fast slew time, and Southern-hemisphere location in Namibia, H.E.S.S. provides an unparalleled, high-quality view of the VHE Galaxy, in a multi-messenger approach that builds on agreeme ... More
Presented by Dr. Ryan CHAVES on 29/10/2015 at 5:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Radiatively inefficient accretion flows (RIAFs) in low-luminosity active galactic nuclei (LLAGNs) have been suggested as cosmic-ray and neutrino sources, which may largely contribute to the observed diffuse neutrino intensity. We show that this scenario naturally predicts hadronic multi-TeV gamma-ray excesses around galactic centers. The protons accelerated in the RIAF in Sagittarius A* (Sgr A*) ... More
Presented by Prof. Yutaka FUJITA on 29/10/2015 at 7:55
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We discuss scenarios which turn to production of gamma-ray emission within the redback type binary systems containing millisecond pulsar and a low mass stellar companion. The millisecond pulsar can eject relativistic leptons from the inner magnetosphere in the rotation powered stage. These leptons, or after additional re-acceleration, can interact with radiation of companion star. In the accre ... More
Presented by Prof. Wlodek BEDNAREK on 29/10/2015 at 8:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We present the results of molecular spectral line observations towards supernova remnants such as W28, RX J1713.7-3946, HESS J1731-347 and CTB 37A. These remnants exhibit TeV gamma-ray emission, beacons for the presence of enhanced populations of high energy particles. It follows that these objects may accelerate Galactic cosmic-ray protons via the diffusive shock mechanism, but knowledge of the e ... More
Presented by Dr. Nigel MAXTED
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
In this contribution the H.E.S.S. programs to follow up on multi-wavelength and multi-messenger observations and alerts will be presented. Ongoing activities searching for high-energy gamma-ray emission in coincidence with Gamma Ray Bursts, recent extensions to Fast Radio Bursts and (in the future) gravitational waves are going to be discussed. Furthermore the newly installed H.E.S.S. multi-messe ... More
Presented by Dr. Fabian SCHÜSSLER on 29/10/2015 at 6:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
gamma-ray astronomy suffers from the sensitivity gap between the energy ranges for which Compton telescopes and pair telescopes are efficient. This blank part of the SED of the cosmic sources that are active at high energy hinders the understanding of their nature. In particular the pi0 bump that is dreamt to be signing the hadronic interactions in the cosmic accelerators that produce the h ... More
Presented by Prof. Denis BERNARD on 29/10/2015 at 9:25
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Our understanding of high-energy emission from Gamma-Ray Bursts has greatly advanced with observations from the Fermi gamma-ray space telescope. I will review the Fermi observations, with particular emphasis on the surprising detection of both prompt and temporally extended emission at high energies. I will also discuss the prospects for detection of GRBs with the High Altitude Water Cherenkov ( ... More
Presented by Dr. Valerie CONNAUGHTON on 27/10/2015 at 5:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
VERITAS is an array of four imaging atmospheric Cherenkov telescopes designed to observe gamma-ray emission from astrophysical objects in the energy range from 85 GeV to > 30 TeV. Located at the Fred Lawrence Whipple Observatory in Arizona, VERITAS has operated successfully over seven years with two major upgrades that improved the performance of the array. The scientific goals of VERITAS include ... More
Presented by Nahee PARK on 27/10/2015 at 6:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
H.E.S.S. is an array of Imaging Atmospheric Cherenkov Telescopes observing the gamma-ray sky beyond ~20 GeV. In the course of the first 10 years of operation, this experiment significantly contributed to the field of ground-based gamma-ray astronomy. In 2012, a fifth telescope was added at the centre of the original array. This large telescope of 28 meters diameter improves the performance of the ... More
Presented by Dr. Aion VIANA on 27/10/2015 at 6:36
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
There are several types of Galactic sources that can potentially accelerate charged particles up to GeV and TeV energies. These accelerated particles can produce Very High Energy (VHE) gamma-ray emission through different processes, for example inverse Compton scattering of ambient photon fields by accelerated electrons. We study various transient and variable stellar objects in the VHE regime us ... More
Presented by Daniela HADASCH on 29/10/2015 at 5:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazar QSO B0218+357 is the most distant AGN (z=0.944) detected so far in the TeV range. It is gravitationally lensed by the galaxy B0218+357G (z=0.68). Very-high-energy (VHE) gamma-ray emission from QSO B0218+357 was detected in July 2014 with the MAGIC telescopes, by measuring the time-delayed image of the flare, detected earlier by FERMI in the GeV range. Its emission enables the study of t ... More
Presented by Prof. Dijana DOMINIS PRESTER on 26/10/2015 at 5:45
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Very-high-energy (VHE, E > 100 GeV) gamma-ray emission from the very distant flat spectrum radio quasar PKS 1441+25 (z = 0.940) was detected in April 2015 with the MAGIC telescopes. Aside from the gravitationally lensed VHE blazar QSO B0218+357 (z = 0.944), also detected by MAGIC, PKS 1441+25 is the most distant VHE blazar detected to date. The VHE detection occurred in April 2015 during enhanced ... More
Presented by Mr. Miguel NIEVAS-ROSILLO on 26/10/2015 at 6:15
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
1ES 1011+496 is a blazar located at a redshift z=0.212, revealed as a very-high-energy gamma-ray emitter by the MAGIC telescopes in 2007. In February 2014 the source underwent an unprecedented flaring episode, reaching a peak flux of almost 14 times the flux measured at the time of discovery, before returning to its low state. The MAGIC telescopes observed the source for a total of 17 nights betwe ... More
Presented by Dr. Abelardo MORALEJO OLAIZOLA on 26/10/2015 at 7:55
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazar Mrk 421 is one of the closest and brightest extragalactic very high energy (VHE, >100 GeV) gamma-ray emitters, and hence one of the VHE objects that we can study best. Since 2009, Mrk 421 is yearly observed during 6 months with more than 25 instruments in the framework of broadband multifrequency campaigns. During April 2013, Mrk421 underwent unprecedented flaring activity in many wav ... More
Presented by Mr. Francesco BORRACCI on 26/10/2015 at 8:43
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi bubbles at the Galactic center have been imaged in sub-TeV gamma rays by the Fermi-Large Area Telescope and might have been detected in 0.3-1 PeV neutrinos by the IceCube Neutrino Observatory. A hadronic model, involving cosmic-ray interactions in the bubble volumes, can account for both gamma-ray and neutrino observations but is far from being confirmed due to low neutrino statistics. W ... More
Presented by Prof. Soebur RAZZAQUE on 27/10/2015 at 8:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Several compact binary systems appeared to have spectral energy distributions that peak is gamma-ray energy band. Almost all these sources have been detected in the high energy and very high energy regimes with Fermi/LAT and ground based Cherenkov detectors, respectively. Detection of very high energy photons from these compact sources implies operation of a very efficient particle accelerato ... More
Presented by Mr. Dmitriy KHANGULYAN on 29/10/2015 at 6:10
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We show that the Fermi Bubbles and the Galactic haze are naturally interpreted as inverse-Compton and synchrotron emission from the same spectrum of cooling cosmic ray electrons. This avoids the ad-hoc spectral features and superfluous acceleration mechanisms typically assumed. The model implies that the bubbles originated 2-3 Myr ago, the mean magnetic field in the haze region is ~3\muG, and the ... More
Presented by Dr. Ilya GURWICH on 27/10/2015 at 9:05
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
X-ray observations of active galactic nuclei (AGN) are revealing the widespread existence of powerful, baryonic outflows reaching mildly relativistic velocities, seen as variable, blue-shifted absorption lines of ionized heavy elements, in both radio-quiet and radio-loud objects. Sometimes called ultra-fast outflows (UFOs), they are plausibly interpreted as winds driven by the accretion disk and m ... More
Presented by Dr. Susumu INOUE on 26/10/2015 at 6:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Gamma-rays give us a view on the acceleration some of the most energetic particles in the universe. These particles are usually thought to be accelerated in (relativistic) shocks. However, with the advances in Particle In Cell simulations over the past years it became clear that magnetic reconnection is also a compelling alternative. In this talk, I will discuss what gamma-ray observations can tel ... More
Presented by Dr. Rolf BUEHLER on 27/10/2015 at 7:30
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
DRAGON is a public software package developed to study CR propagation in the Galaxy. It includes diffusive/advective transport, as well as reacceleration and energy losses, for most of the nuclear and lepton species. Each species can originate from astrophysical sources (e.g., SNR, Pulsars) or from DM annihilations/decays in the halo, making the code very suitable both for studying Galactic high- ... More
Presented by Dr. Carmelo EVOLI on 27/10/2015 at 7:55
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Pulsars and their synchrotron nebulae have been extensively observed in the gamma-ray energy band only in the last 10 years. With the advent of the Fermi satellite the number of known gamma-ray emitting pulsars has increased by one order of magnitude, touching the 150 mark. On the other hand, the last generation of imaging Cherenkov telescopes proved that the pulsar wind nebulae are the most popul ... More
Presented by Dr. Roberta ZANIN on 27/10/2015 at 5:25
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Vela pulsar (PSR J0835 − 4510) is the brightest persistent source in the high-energy γ-ray sky. It is a relatively near, young and energetic rotation-powered pulsar. Vela was a key target for the High Energy Stereoscopic System phase II array (H.E.S.S. II). Observations were carried out following a hint of pulsed emission above 20GeV seen using Fermi-LAT data. In this talk we present detail ... More
Presented by Bronislaw RUDAK on 29/10/2015 at 5:20
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Fermi-LAT measurements of the diffuse Galactic gamma-ray emission reveal a hardening of the cosmic-ray (CR) spectrum with decreasing Galactocentric radius. This result can be the signature of different CR trasport properties in the inner Galaxy, and in particular a harder rigidity scaling of the diffusion coefficient. We model this effect with DRAGON and we provide a good description of both ... More
Presented by Dr. Daniele GAGGERO on 27/10/2015 at 8:20
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
MAGIC (Major Atmospheric Gamma Imaging Cherenkov) is a system of two imaging atmospheric Cherenkov telescopes located at the Canary island of La Palma. The telescopes are performing observations of gamma rays with energies between 50 GeV and tens of TeV. In 2014 MAGIC celebrated its 10th anniversary of scientific operations. In this talk I will present the recent highlights of the observation ... More
Presented by Julian SITAREK on 27/10/2015 at 5:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
By upgrading the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes with a fifth, 28-m diameter telescope, the sensitivity of H.E.S.S. towards low gamma-ray energies has been extended to energies below 100 GeV. This allows studies particularly of distant Active Galactic Nuclei (AGN) with soft gamma-ray spectra. Results of observations with the five-telescope array will be discussed, includ ... More
Presented by Dr. Robert WAGNER on 26/10/2015 at 5:25
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The blazars high-energy emission is believed to be produced in the jets, powered by their central supermassive black holes. At the same time the location of the emission region within the jet is presently uncertain - mainly due to its extremely small angular size, far beyond the capabilities of the existing gamma-ray instruments. However, in the rare case of the gravitationally lensed blazars, it ... More
Presented by Dr. Ievgen VOVK on 26/10/2015 at 6:00
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
PG 1553+113 is a blazar with an uncertain redshift detected at very high energies (VHE; E > 100 GeV) both during high and quiescent flux states. In late 2014, the Fermi/LAT collaboration reported the detection of a hint of a ~2-year periodicity in the integral flux emitted at optical and high-energy (HE) gamma rays. Interestingly, this periodicity might be interpreted as an evidence of the presen ... More
Presented by Dr. Elisa PRANDINI
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Ground-based gamma-ray astronomy is still tackling a major problem: background. Reconstruction techniques exist to distinguish most of the background of hadrons but an irreducible background of electrons and gamma-like protons still remain. I present here a new technique making use of direct Cherenkov light and air shower development that provides a way to efficiently distinguish between electrons ... More
Presented by Ms. Tanya EDWARDS on 26/10/2015 at 9:13
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We present recent results on the high-frequency-peaked BL Lac object Markarian 501 derived from extensive multi-wavelength campaigns in the years 2009, 2012 and 2013. The blazar is located in our extragalactic neighborhood (z=0.034), which reduces spectral uncertainties due to absorption effects of the Extragalactic Background Light and allows for significant detections on sub-hour timescales, thu ... More
Presented by Dr. Marlene DOERT on 26/10/2015 at 8:58
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We propose a model to explain the ultra-bright GeV gamma-ray flares observed from the blazar 3C454.3. The model is based on the concept of a relativistic jet interacting with compact gas condensations produced when a star (red giant) crosses the jet close to the central black hole. The study includes an analytical treatment of the evolution of the envelop lost by the star within the jet, and calcu ... More
Presented by Dr. Maxim BARKOV on 26/10/2015 at 8:28
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Multi-wavelength observations of blazars have revealed curved feature in photon spectrum. Moreover, in some cases, the required electron spectral index at injection becomes harder than 2. In order to reproduce such a curved electron spectrum, we discuss the second order Fermi acceleration by turbulence in the jet. Here, we focus on the time-dependent effects of the electron acceleration and inject ... More
Presented by Dr. Katsuaki ASANO on 26/10/2015 at 6:45
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Recent analyses of Fermi Large Area Telescope data show an extended GeV γ-ray excess on top of the expected diffuse background in the Galactic center region, which can be explained by annihilating dark matter (DM) or a population of millisecond pulsars (MSPs). We propose observations of very high energy (VHE) γ-rays to distinguish the MSP scenario from the DM scenario. GeV γ-ray MSPs should rel ... More
Presented by Dr. Kunihito IOKA on 29/10/2015 at 8:15
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
In the framework of the international Cherenkov Telescope Array (CTA) observatory, the Italian National Institute for Astrophysics (INAF) has developed a large field-of-view (9.6 degrees), dual-mirror, small-sized, end-to-end telescope (ASTRI SST-2M). This prototype has been installed at Mt. Etna (Italy) on September 2014, and it is currently undergoing engineering tests. Soon after the scientific ... More
Presented by Dr. Saverio LOMBARDI on 26/10/2015 at 9:28
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
A spatially extended excess of gamma rays collected by the Fermi-LAT from the inner region of the Milky Way has been discovered by different groups and with increasingly sophisticated techniques of data analysis. I will review the characterization of spectral and morphological properties of the excess when variations of the Galactic diffuse emission are properly taken into account. Recently, there ... More
Presented by Dr. Francesca CALORE on 27/10/2015 at 8:50
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
We present the results from the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope of the search for TeV variability in the very high energy (VHE) gamma ray regime performed in the years 2012-2015 during the pericenter passage of the G2 gas cloud. This gas cloud orbits the Galactic Center (GC) on a highly eccentric trajectory with a pericenter distance of only a few thousand Schwarzschild ... More
Presented by Dr. Christian FRUCK on 29/10/2015 at 5:35
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Mopra Southern Galactic Plane molecular gas survey is the next generation CO survey of the distribution and dynamics of the molecular gas along the southern galactic plane. Being conducted with 0.6 arcmin and 0.1 km/s resolution, it provides an order of magnitude improvement in both spatial and spectral resolution over the Dame et al 2001 survey, currently our standard source of reference on ... More
Presented by Prof. Michael BURTON on 29/10/2015 at 8:55
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Above tens of GeV, gamma-ray observations with the Fermi Large Area Telescope (LAT) are often dominated by statistical uncertainties due to the low source flux and the limited acceptance. The newly released Pass 8 analysis extended the acceptance of Fermi-LAT to ~ 2.5 m^2 sr over 100 GeV, and made effective an event class that can improve the acceptance at these very high gamma-ray energies: the ... More
Presented by Mr. Mitsunari TAKAHASHI on 29/10/2015 at 9:40
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The Very High Energy (VHE) emission from the Galactic Center Ridge was revealed by H.E.S.S. in 2006, after subtraction of the two bright point sources HESS J1745-290 possibly associated with Sgr A*, and HESS J1747-281 associated with the composite supernova remnant G0.9+0.1. The hard spectrum of the Ridge emission and its spatial correlation with the local gas density suggest that the emission is ... More
Presented by Dr. Anne LEMIÈRE on 27/10/2015 at 9:20
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
H.E.S.S. has measured large-scale diffuse emission that is on first sight not attributable to gamma-ray sources. The signal consists most likely of a combination of emission from pion decay of cosmic-ray interactions with Galactic gas, inverse Compton scattering of cosmic-ray electrons, and a contribution of unresolved gamma-ray sources, caused by the sensitivity limits that restrict the depth of ... More
Presented by Dr. Kathrin EGBERTS
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
The extremely energetic and variable population of gamma-ray blazars has been extensively scrutinised, for over a decade now, in multi wavelength observations, extending from radio to TeV energies, and spanning timescales that go from the short episodes of single flares, to campaigns that last over several years. All this immense observational effort is contributing to slowly build a more complete ... More
Presented by Dr. Ulisses BARRES DE ALMEIDA
Type: Oral presentation Session: Gamma-Ray Astrophysics
Track: Gamma-ray Astrophysics
Diffusive shock acceleration (DSA), a well-developed theory of the acceleration process at work in supernova remnants (SNRs), lays the foundation for the SNR paradigm of the CR origin, though key problems are yet to be solved. Determining the acceleration efficiency is one of the key issues, where the term “acceleration efficiency” carries two different meanings; one is related to the maximum ... More
Presented by Dr. Yasunobu UCHIYAMA on 29/10/2015 at 7:30
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