{"id":9504,"date":"2020-10-23T09:26:00","date_gmt":"2020-10-23T00:26:00","guid":{"rendered":"https:\/\/www.icrr.u-tokyo.ac.jp\/?post_type=event_researcher&#038;p=9504"},"modified":"2020-10-30T21:32:06","modified_gmt":"2020-10-30T12:32:06","slug":"new10%e6%9c%8823%e6%97%a5%e9%96%8b%e5%82%ac-the-mystery-of-the-mev-gamma-ray-emission-from-gamma-ray-binary-systems-%e7%b1%b3%e7%94%b0%e6%b5%a9%e5%9f%ba-%e7%90%86%e7%a0%94-2","status":"publish","type":"event_researcher","link":"https:\/\/www.icrr.u-tokyo.ac.jp\/en\/event_researcher\/9504\/","title":{"rendered":"The mystery of the MeV gamma-ray emission from gamma-ray binary systems: Dr. Hiroki Yoneda (RIKEN)"},"content":{"rendered":"\n<figure class=\"wp-block-table\"><div class=\"js-scrollable\"><table><tbody><tr><td>&nbsp;Number<\/td><td>R2-4<\/td><\/tr><tr><td>&nbsp;Date&amp;Time<\/td><td>&nbsp;October 23, 2020 15:30-17:00<\/td><\/tr><tr><td>&nbsp;Place<\/td><td>ZOOM<br><a href=\"https:\/\/zoom.us\/j\/98809950695?pwd=YUtQVzU2VjNpcWNsRCtyV25kOFpXQT099\">https:\/\/zoom.us\/j\/98809950695?pwd=YUtQVzU2VjNpcWNsRCtyV25kOFpXQT09<\/a><\/td><\/tr><tr><td>&nbsp;Speaker<\/td><td>&nbsp;Dr. Hiroki Yoneda (RIKEN)<\/td><\/tr><tr><td>&nbsp;Title<\/td><td>&#8220;The mystery of the MeV gamma-ray emission from gamma-ray binary systems&#8221;<\/td><\/tr><tr><td>&nbsp;Abstract<\/td><td>From the middle of the 2000s, a new class of compact binary systems is established, so-called gamma-ray binary systems. They show non-thermal emission peaking above 1 MeV in their SEDs, which is completely different from X-ray binaries. This feature indicates that particle acceleration takes place in these binaries, however, the physical mechanism of their activities is still unclear. In this talk, I will report our recent results of X-ray\/gamma-ray observations of the brightest gamma-ray binary system LS 5039: 1) LS 5039 has at least four spectral components from X-ray to TeV. The dominant MeV gamma-ray component indicates a more efficient acceleration than Fermi acceleration. 2) A sign of pulsation was found in the hard X-ray emission with\u00a0\u223c3\u03c3. If it is real, the period and its derivative suggest that the compact object is a magnetar. Based on these results, I also will explain a new acceleration scenario for this object: LS 5039 contains a magnetar, and particles are accelerated via magnetic reconnection close to the magnetar.<br>Presentation(<a href=\"https:\/\/www.icrr.u-tokyo.ac.jp\/icrr_seminar\/seminars20\/20201023_Yoneda.pdf\">PDF<\/a>)<\/td><\/tr><\/tbody><\/table><\/div><\/figure>\n","protected":false},"featured_media":0,"template":"","tag_year":[],"class_list":["post-9504","event_researcher","type-event_researcher","status-publish","hentry","en-US"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/event_researcher\/9504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/event_researcher"}],"about":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/types\/event_researcher"}],"wp:attachment":[{"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/media?parent=9504"}],"wp:term":[{"taxonomy":"tag_year","embeddable":true,"href":"https:\/\/www.icrr.u-tokyo.ac.jp\/wp-json\/wp\/v2\/tag_year?post=9504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}