Mrk 421在2008年的活跃态：MAGIC的观测、同时性多波段观测与受约束的SSC模型
高能天体物理现象
2015-05-28 v3
摘要
背景：耀变体Markarian 421是北天最明亮的TeV伽马射线源之一。从2007年12月到2008年6月，单碟主大气伽马射线成像切伦科夫望远镜（MAGIC-I）在甚高能（VHE，E > 100 GeV）波段对其进行了密集观测。目的：我们旨在测量耀变体喷流在活跃态期间辐射区的物理参数。方法：我们利用MAGIC-I对源进行了VHE波段的密集监测，并收集了软X射线与光学-UV波段的补充数据；随后，在同步自康普顿（SSC）框架内，对由同时性多波段数据导出的谱能量分布（SED）进行了建模。结果：在整个期间，该源表现出强烈且持久的伽马射线活动，积分通量（E > 200 GeV）极少低于蟹状星云水平，最高可达该值的3.6倍。在不同爆发阶段获得了8组同时性光学-UV（KVA，Swift/UVOT）、软X射线（Swift/XRT）与MAGIC-I VHE数据。一旦将所获得的谱能量分布在单区SSC轻子模型框架内进行解释，这些数据就能约束喷流的物理参数。结论：研究的主要结果是，在均匀模型内需要高多普勒因子（40 <= delta <= 80）才能重现观测到的SED；但该模型无法解释观测到的短时标变化性，而可以论证的是，非均匀模型可能允许较不极端的多普勒因子、更强的磁场以及与小时或亚小时尺度变化性相容的更短电子冷却时间。
引用
@article{arxiv.1106.1589,
title = {Mrk 421 active state in 2008: the MAGIC view, simultaneous multi-wavelength observations and SSC model constrained},
author = {J. Aleksic and E. A. Alvarez and L. A. Antonelli and P. Antoranz and M. Asensio and M. Backes and J. A. Barrio and D. Bastieri and J. Becerra Gonzalez and W. Bednarek and A. Berdyugin and K. Berger and E. Bernardini and A. Biland and O. Blanch and R. K. Bock and A. Boller and G. Bonnoli and D. Borla Tridon and I. Braun and T. Bretz and A. Canellas and E. Carmona and A. Carosi and P. Colin and E. Colombo and J. L. Contreras and J. Cortina and L. Cossio and S. Covino and F. Dazzi and A. De Angelis and G. De Caneva and E. De Cea del Pozo and B. De Lotto and C. Delgado Mendez and A. Diago Ortega and M. Doert and A. Dominguez and D. Dominis Prester and D. Dorner and M. Doro and D. Elsaesser and D. Ferenc and M. V. Fonseca and L. Font and C. Fruck and R. J. Garcia Lopez and M. Garczarczyk and D. Garrido and G. Giavitto and N. Godinovic and D. Hadasch and D. Häfner and A. Herrero and D. Hildebrand and D. Höhne-Mönch and J. Hose and D. Hrupec and B. Huber and T. Jogler and H. Kellermann and S. Klepser and T. Krahenbuh and J. Krause and A. La Barbera and D. Lelas and E. Leonardo and E. Lindfors and S. Lombardi and A. Lopez and M. Lopez and E. Lorenz and M. Makariev and G. Maneva and N. Mankuzhiyil and K. Mannheim and L. Maraschi and M. Mariotti and M. Martinez and D. Mazin and M. Meucci and J. M. Miranda and R. Mirzoyan and H. Miyamoto and J. Moldon and A. Moralejo and P. Munar-Adrover and D. Nieto and K. Nilsson and R. Orito and I. Oya and D. Paneque and R. Paoletti and S. Pardo and J. M. Paredes and S. Partini and M. Pasanen and F. Pauss and M. A. Perez-Torres and M. Persic and L. Peruzzo and M. Pilia and J. Pochon and F. Prada and P. G. Prada Moroni and E. Prandini and I. Puljak and I. Reichardt and R. Reinthal and W. Rhode and M. Ribo and J. Rico and S. Rügamer and A. Saggion and K. Saito and T. Y. Saito and M. Salvati and K. Satalecka and V. Scalzotto and V. Scapin and C. Schultz and T. Schweizer and M. Shayduk and S. N. Shore and A. Sillanpaa and J. Sitarek and D. Sobczynska and F. Spanier and S. Spiro and A. Stamerra and B. Steinke and J. Storz and N. Strah and T. Suric and L. Takalo and H. Takami and F. Tavecchio and P. Temnikov and T. Terzic and D. Tescaro and M. Teshima and O. Tibolla and D. F. Torres and A. Treves and M. Uellenbeck and H. Vankov and P. Vogler and R. M. Wagner and Q. Weitzel and V. Zabalza and F. Zandanel and R. Zanin},
journal= {arXiv preprint arXiv:1106.1589},
year = {2015}
}
备注
12 pages, 7 figures. Accepted for publication in A&A 7 January 2012