Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
MAGIC Collaboration, V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E.… 展开作者
MAGIC Collaboration, V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Babić, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, O. Blanch, G. Bonnoli, G. Busetto, R. Carosi, G. Ceribella, S. Cikota, S. M. Colak, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, E. Do Souto Espiñera, A. Domínguez, D. Dominis Prester, M. Doro, V. Fallah Ramazani, A. Fattorini, A. Fernández-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, D. Galindo, S. Gallozzi, R. J. García López, M. Garczarczyk, S. Gasparyan, M. Gaug, P. Giammaria, N. Godinović, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, J. Herrera, J. Hoang, D. Hrupec, S. Inoue, K. Ishio, Y. Iwamura, H. Kubo, J. Kushida, D. Kuveždić, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, A. López-Oramas, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, L. Maraschi, M. Mariotti, M. Martínez, S. Masuda, D. Mazin, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, V. Moreno, E. Moretti, P. Munar-Adrove r, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. M. Paredes, G. Pedaletti, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, J. R. Garcia, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, M. Strzys, T. Surić, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albá, S. Tsujimoto, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, I. Vovk, M. Will, D. Zarić, FACT Collaboration, :, A. Arbet-Engels, D. Baack, M. Balbo, A. Biland, M. Blank, T. Bretz, K. Bruegge, M. Bulinski, J. Buss, M. Doerr, D. Dorner, S. Einecke, D. Elsaesser, D. Hildebrand, L. Linhoff, K. Mannheim, S. Mueller, D. Neise, A. Neronov, M. Noethe, A. Paravac, W. Rhode, B. Schleicher, F. Schulz, K. Sedlaczek, A. Shukla, V. Sliusar, E. von Willert, R. Walter, C. Wendel, A. Tramacere, A. Lien, M. Perri, F. Verrecchia, M. Armas Padilla, C. Leto, A. Lähteenmäki, M. Tornikoski, J. Tammi
备注：
Accepted for publication in A&A. Corresponding authors: J. Becerra González (jbecerra@iac.es), D. Paneque (dpaneque@mppmu.mpg.de), C. Wendel (cwendel@astro.uni-wuerzburg.de)
Mrk501 is a very high-energy (VHE) gamma-ray blazar located at z=0.034. During a period of two weeks in July 2014, the highest X-ray activity of Mrk501 was observed in ~14 years of operation of the Neil Gehrels Swift Gamma-ray Burst Observatory. We characterize the broadband variability of Mrk501 from radio to VHE gamma rays, and evaluate whether it can be interpreted within theoretical scenarios widely used to explain the broadband emission from blazars. The temporal evolution of the most prominent and variable segments of the SED is described with a one-zone synchrotron self-Compton model with variations in the break energy of the electron energy distribution (EED), and with some adjustments in the magnetic field strength and spectral shape of the EED. A narrow feature at ~3 TeV was observed in the VHE spectrum measured on 2014 July 19 (MJD 56857.98), which is the day with the highest X-ray flux ($>0.3$ keV) measured during the entire Swift mission. This feature is inconsistent with the classical analytic functions to describe the measured VHE spectra (power law, log-parabola, and log-parabola with exponential cutoff) at more than 3$σ$. A fit with a log-parabola plus a narrow component is preferred over the fit with a single log-parabola at more than 4$σ$, and a dedicated Monte Carlo simulation estimated the significance of this extra component to be larger than 3$σ$. Under the assumption that this VHE spectral feature is real, we show that it can be reproduced with three distinct theoretical scenarios: a) a pileup in the EED due to stochastic acceleration; b) a structured jet with two-SSC emitting regions, with one region dominated by an extremely narrow EED; and c) an emission from an IC pair cascade.
Markarian Multiwavelength Data Center (MMDC): A Tool for Retrieving and Modeling Multi-temporal, Multi-wavelength and Multi-messenger Data from Blazar Observations
Broadband X-ray Spectral and Timing Analyses of the Black Hole Binary Candidate Swift J1658.2-4242: Rapid Flux Variation and the Turn-on of a Transient QPO
The Broadband X-ray Spectral Properties during the Rising Phases of the Outburst of the New Black Hole X-ray Binary Candidate Swift J1727.8-1613
QingHai University（青海大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Dongguan Neutron Science Center（东莞中子科学中心）；University of Chinese Academy of Sciences（中国科学院大学）
Evolution of the Inner Accretion Flow in Swift J1727.8$-$1613 across Intermediate States: Insights from Broadband Spectral and Timing Analysis
Inter-University Centre for Astronomy and Astrophysics（天文与天体物理大学间中心）；Institute of Astronomy, National Tsing Hua University（国立清华大学天文研究所）；Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（波兰科学院尼古拉·哥白尼天文学中心）；Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya (A Central University)（古鲁·加西达斯维什瓦维迪亚亚拉（一所中央大学）纯与应用物理系）
A break in the X-ray loudness of Markarian 590: evidence for an AGN spectral state transition?
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences（尼古拉·哥白尼天文中心，波兰科学院）；DARK, Niels Bohr Institute, University of Copenhagen（DARK，哥本哈根大学尼尔斯·玻尔研究所）；Steward Observatory and Department of Astronomy, University of Arizona（亚利桑那大学斯图尔德天文台和天文学系）；Bishop’s University, Department of Physics & Astronomy（主教大学物理与天文学系）；Inter-University Centre for Astronomy and Astrophysics（大学间天文与天体物理中心）
Broadband X-ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937
我们已经产生了一个扩展版本，而简化，但物理上面向三维磁星发射模型，STEMS 3D，允许光谱调查高达100千电子伏。然后，我们将其应用到四个磁星的宽带光谱：4U 0142+61，1 E 1841-045，1 E 2259+586和1 E 1048.1-5937，使用的数据在软X射线Swift/XRT或XMM-牛顿，和核光谱望远镜阵列在硬X射线波段。我们发现，4U 0142+61的硬X射线发射与早期的探测相比在光谱上是硬的，这表明该源可能处于向更硬的状态或从更硬的状态转变的过程中。我们发现，这四个磁星的表面性质是一致的，我们已经得到了只使用软X射线数据与STEMS 3D，这意味着我们的物理动机的磁星发射模型是一个强大的工具。基于我们的宽带光谱调查，我们得出结论，磁层中的表面光子的共振散射单独不能占硬X射线发射磁星，因此，一个额外的非热过程，或人口的相对论电子是必需的。我们还讨论了在1 E 1048.1-5937中未检测到持续硬X射线发射的含义。
