期刊
ASTRONOMY & ASTROPHYSICS
卷 595, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201629461
关键词
gamma rays: galaxies; gravitational lensing: strong; galaxies: jets; radiation mechanisms: non-thermal; quasars: individual: QSO B0218+357
资金
- German BMBF
- MPG
- Italian INFN
- INAF
- Swiss National Fund SNF
- ERDF under the Spanish MINECO [FPA2012-39502]
- Japanese JSPS
- MEXT
- Centro de Excelencia Severo Ochoa [SEV-2012-0234, CPAN CSD2007-00042, MultiDark CSD2009-00064]
- Academy of Finland [268740]
- Croatian Science Foundation (HrZZ) Project [09/176]
- University of Rijeka [13.12.1.3.02]
- DFG Collaborative Research Centers [SFB823, SFB876]
- Polish MNiSzW grant [745/N-HESS-MAGIC/2010/0]
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
- ICREA Funding Source: Custom
- Grants-in-Aid for Scientific Research [16K05381, 24000004] Funding Source: KAKEN
Context. QSO B0218+357 is a gravitationally lensed blazar located at a redshift of 0.944. The gravitational lensing splits the emitted radiation into two components that are spatially indistinguishable by gamma-ray instruments, but separated by a 10-12 day delay. In July 2014, QSO B0218+357 experienced a violent flare observed by the Fermi-LAT and followed by the MAGIC telescopes. Aims. The spectral energy distribution of QSO B0218+357 can give information on the energetics of z similar to 1 very high energy gamma-ray sources. Moreover the gamma-ray emission can also be used as a probe of the extragalactic background light at z similar to 1. Methods. MAGIC performed observations of QSO B0218+357 during the expected arrival time of the delayed component of the emission. The MAGIC and Fermi-LAT observations were accompanied by quasi-simultaneous optical data from the KVA telescope and X-ray observations by Swift-XRT. We construct a multiwavelength spectral energy distribution of QSO B0218+357 and use it to model the source. The GeV and sub-TeV data obtained by Fermi-LAT and MAGIC are used to set constraints on the extragalactic background light. Results. Very high energy gamma-ray emission was detected from the direction of QSO B0218 +357 by the MAGIC telescopes during the expected time of arrival of the trailing component of the flare, making it the farthest very high energy gamma-ray source detected to date. The observed emission spans the energy range from 65 to 175 GeV. The combined MAGIC and Fermi-LAT spectral energy distribution of QSO B0218+357 is consistent with current extragalactic background light models. The broadband emission can be modeled in the framework of a two-zone external Compton scenario, where the GeV emission comes from an emission region in the jet, located outside the broad line region.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据