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| 題名: | FIRST NuSTAR OBSERVATIONS of MRK 501 WITHIN A RADIO to TeV MULTI-INSTRUMENT CAMPAIGN |
| 作者: | 陳文屏;24420530 - Böttcher, Markus;Furniss, A;Chiang, J;Böttcher, M;Boggs, S;Noda, K |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ASTRO;Astrophysics;BL Lacertae objects: general;Broadband;Emission;galaxies: individual (Markarian 501);GRQC;Lidar;Sand;Synchrotrons;Telescopes;X-ray telescopes;X-rays;X-rays: galaxies |
| 日期: | 2015-10-10 |
| 上傳時間: | 2026-04-21 14:39:18 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States: American Astronomical Society |
| 摘要: | 摘要： We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 2013 April 1 and August 10, including the first detailed characterization of the synchrotron peak with Swift and NuSTAR. During the campaign, the nearby BL Lac object was observed in both a quiescent and an elevated state. The broadband campaign includes observations with NuSTAR, MAGIC, VERITAS, the Fermi Large Area Telescope, Swift X-ray Telescope and UV Optical Telescope, various ground-based optical instruments, including the GASPWEBT program, as well as radio observations by OVRO, Metsähovi, and the F-Gamma consortium. Some of the MAGIC observations were affected by a sand layer from the Saharan desert, and had to be corrected using eventby- event corrections derived with a Light Detection and Ranging (LIDAR) facility. This is the first time that LIDAR information is used to produce a physics result with Cherenkov Telescope data taken during adverse atmospheric conditions, and hence sets a precedent for the current and future ground-based gamma-ray instruments. The NuSTAR instrument provides unprecedented sensitivity in hard X-rays, showing the source to display a spectral energy distribution (SED) between 3 and 79 keV consistent with a log-parabolic spectrum and hard X-ray variability on hour timescales. None (of the four extended NuSTAR observations) show evidence of the onset of inverse-Compton emission at hard X-ray energies. We apply a single-zone equilibrium synchrotron self- Compton (SSC) model to five simultaneous broadband SEDs. We find that the SSC model can reproduce the observed broadband states through a decrease in the magnetic field strength coinciding with an increase in the luminosity and hardness of the relativistic leptons responsible for the high-energy emission
其他題名： APJ
其他題名： Astrophys. J
出版者： United States: American Astronomical Society
出版日期： 2015-10-10
出處： The Astrophysical journal, 2015-10, Vol.812 (1), p.65-22
資源來源： Institute of Physics Journals
版權： 2015. The American Astronomical Society. All rights reserved.
識別號： ISSN: 0004-637X
識別號： ISSN: 1538-4357
識別號： EISSN: 1538-4357
識別號： DOI: 10.1088/0004-637X/812/1/65 |
| 顯示於類別: | [天文研究所] 期刊論文
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