相关论文: Microvariability in BL Lac: Zooming into the Inner…

Multiwavelength observations of the blazar BL Lacertae in June 2015

BL Lacertae is a blazar at the redshift of z = 0.069, eponym of the BL Lac blazar type. It is also a prototype of the low-frequency-peaked BL Lac (LBL) subclass. It was first detected in sub-TeV gamma-ray range by MAGIC in 2005. In 2015,…

高能天体物理现象 · 物理学 2017-09-18 Shimpei Tsujimoto , Monica Vazquez Acosta , Elina Lindfors , Daniel Mazin , Giovanna Pedaletti , Vandad Fallah Ramazani , Filippo D'Ammand , Julian Sitarek , Junko Kushida , Kyoshi Nishijima , the MAGIC Collaboration , the Fermi-LAT Collaboration

X-ray Intraday Variability of Five TeV Blazars with NuSTAR

We have examined 40 NuSTAR light curves (LCs) of five TeV emitting high synchrotron peaked blazars: 1ES 0229+200, Mrk 421, Mrk 501, 1ES 1959+650 and PKS 2155-304. Four of the blazars showed intraday variability in the NuSTAR energy range of…

高能天体物理现象 · 物理学 2017-12-20 Ashwani Pandey , Alok C. Gupta , Paul J. Wiita

Near Infrared Intraday Variability of Mrk 421

We report results from our monitoring of the BL Lac object Mrk 421 in the near-IR $J$ band. The observations, aimed at studying the intraday variability (IDV) of the object, were carried out systematically over an extended (and…

天体物理学 · 物理学 2009-11-10 A. C. Gupta , D. P. K. Banerjee , N. M. Ashok , U. C. Joshi

Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and $\gamma$-ray activity in 2015$-$2016

We report a characterization of the multi-band flux variability and correlations of the nearby (z=0.031) blazar Markarian 421 (Mrk 421) using data from Mets\"{a}hovi, Swift, Fermi-LAT, MAGIC, FACT and other collaborations and instruments…

高能天体物理现象 · 物理学 2021-05-26 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , K. Asano , A. Babić , B. Banerjee , A. Baquero , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , M. Bernardos , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , M. Cerruti , Y. Chai , A. Chilingarian , S. Cikota , S. M. Colak , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , G. D'Amico , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , M. Delfino , J. Delgado , C. Delgado Mendez , D. Depaoli , T. Di Girolamo , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , M. Doro , V. Fallah Ramazani , A. Fattorini , G. Ferrara , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , P. Gliwny , N. Godinović , J. G. Green , D. Green , D. Hadasch , A. Hahn , L. Heckmann , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , J. Jormanainen , L. Jouvin , Y. Kajiwara , M. Karjalainen , D. Kerszberg , Y. Kobayashi , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , S. Mender , S. Mićanović , D. Miceli , T. Miener , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , S. Nozaki , Y. Ohtani , T. Oka , J. Otero-Santos , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , L. Pavletić , P. Peñil , C. Perennes , M. Persic , P. G. Prada Moroni , E. Prandini , C. Priyadarshi , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , B. Schleicher , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Spolon , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , L. Tosti , S. Truzzi , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , S. Ventura , V. Verguilov , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić , FACT collaboration , : , A. Arbet-Engels , D. Baack , M. Balbo , M. Beck , N. Biederbeck , A. Biland , T. Bretz , K. Bruegge , J. Buss , D. Dorner , D. Elsaesser , D. Hildebrand , R. Iotov , M. Klinger , K. Mannheim , D. Neise , A. Neronov , M. Noethe , A. Paravac , W. Rhode , B. Schleicher , V. Sliusar , F. Theissen , R. Walter , MWL Collaborators , : , J. Valverde , D. Horan , M. Giroletti , M. Perri , F. Verrecchia , C. Leto , A. C. Sadun , J. W. Moody , M. Joner , A. P. Marscher , S. G. Jorstad , A. Lähteenmäki , M. Tornikoski , V. Ramakrishnan , E. Järvelä , R. J. C. Vera , S. Righini , A. Y. Lien

Characterizing optical variability of OJ 287 in 2016 - 2017

We report on a recent multi-band optical photometric and polarimetric observational campaign of the blazar OJ 287 which was carried out during September 2016 -- December 2017. We employed nine telescopes in Bulgaria, China, Georgia, Japan,…

高能天体物理现象 · 物理学 2019-12-11 Alok C. Gupta , Haritma Gaur , Paul J. Wiita , A. Pandey , P. Kushwaha , S. M. Hu , O. M. Kurtanidze , E. Semkov , G. Damljanovic , A. Goyal , M. Uemura , A. Darriba , Xu Chen , O. Vince , M. F. Gu , Z. Zhang , R. Bachev , R. Chanishvili , R. Itoh , M. Kawabata , S. O. Kurtanidze , T. Nakaoka , M. G. Nikolashvili , L. Stawarz , A. Strigachev

An active state of the BL Lac Object Markarian 421 detected by INTEGRAL in April 2013

Multiwavelength variability of blazars offers indirect insight into their powerful engines and on the mechanisms through which energy is propagated from the centre down the jet. The BL Lac object Mkn 421 is a TeV emitter, a bright blazar at…

高能天体物理现象 · 物理学 2014-10-22 E. Pian , M. Tuerler , M. Fiocchi , R. Boissay , A. Bazzano , L. Foschini , F. Tavecchio , V. Bianchin , G. Castignani , C. Ferrigno , C. M. Raiteri , M. Villata , V. Beckmann , F. D'Ammando , R. Hudec , G. Malaguti , L. Maraschi , T. Pursimo , P. Romano , S. Soldi , A. Stamerra , A. Treves , P. Ubertini , S. Vercellone , R. Walter

Frequency and Time Dependence of Linear Polarization in Turbulent Jets of Blazars

Time-variable polarization is an extremely valuable observational tool to probe the dynamical physical conditions of blazar jets. Since 2008, we have been monitoring the flux and linear polarization of a sample of gamma-ray bright blazars…

高能天体物理现象 · 物理学 2021-05-04 Alan P. Marscher , Svetlana G. Jorstad

A New Phase of Optical Activity of BL Lacertae in the Fall of 2024: Intra-Night Flux and Polarization Variations

BL Lacertae is not only archetypical of an entire class of jet-dominated active galactic nuclei, blazars, but also one of the most active and rapidly changing objects in this class. In the fall of 2024 (September--November), BL Lacertae…

高能天体物理现象 · 物理学 2025-11-11 Rumen Bachev , Milen Minev , Anton Strigachev , Alexander Kurtenkov

Unravelling the complex behavior of Mrk 421 with simultaneous X-ray and VHE observations during an extreme flaring activity in April 2013

We report on a multi-band variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 2013 April 19. The study uses, among others, data from GASP-WEBT, Swift, NuSTAR,…

高能天体物理现象 · 物理学 2020-07-22 MAGIC collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , D. Baack , A. Babic , B. Banerjee , U. Barres de Almeida , J. A. Barrio , J. Becerra Gonzalez , W. Bednarek , L. Bellizzi , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Z. Bosnjak , G. Busetto , R. Carosi , G. Ceribella , M. Cerruti , Y. Chai , A. Chilingarian , S. Cikota , S. M. Colak , U. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , F. Del Puppo , M. Delfino , J. Delgado , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espineira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , V. Fallah Ramazani , A. Fattorini , G. Ferrara , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. Garcia Lopez , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , P. Gliwny , N. Godinovic , D. Green , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , M. Hutten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , L. Jouvin , Y. Kajiwara , D. Kerszberg , Y. Kobayashi , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. Lopez , R. Lopez-Coto , A. Lopez-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martinez , D. Mazin , S. Mender , S. Micanovic , D. Miceli , T. Miener , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogues , S. Nozaki , Y. Ohtani , T. Oka , J. Otero-Santos , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , L. Pavletic , P. Penil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribo , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , B. Schleicher , K. Schmidt , T. Schweizer , J. Sitarek , I. Snidaric , D. Sobczynska , A. Spolon , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Suric , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzic , M. Teshima , N. Torres-Alba , L. Tosti , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , S. Ventura , V. Verguilov , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zaric , Other groups , : , M. Petropoulou , J. Finke , F. D'Ammando , M. Balokovic , G. Madejski , K. Mori , Simonetta Puccetti , C. Leto , M. Perri , F. Verrecchia , M. Villata , C. M. Raiteri , I. Agudo , R. Bachev , A. Berdyugin , D. A. Blinov , R. Chanishvili , W. P. Chen , R. Chigladze , G. Damljanovic , C. Eswaraiah , T. S. Grishina , S. Ibryamov , B. Jordan , S. G. Jorstad , M. Joshi , E. N. Kopatskaya , O. M. Kurtanidze , S. O. Kurtanidze , E. G. Larionova , L. V. Larionova , V. M. Larionov , G. Latev , H. C. Lin , A. P. Marscher , A. A. Mokrushina , D. A. Morozova , M. G. Nikolashvili , E. Semkov , P. S. Smith , A. Strigachev , Yu. V. Troitskaya , I. S. Troitsky , O. Vince , J. Barnes , T. Guever , J. W. Moody , A. C. Sadun , T. Hovatta , J. L. Richards , W. Max-Moerbeck , A. C. R. Readhead , A. Lahteenmaki , M. Tornikoski , J. Tammi , V. Ramakrishnan , R. Reinthal

The Outburst of the Blazar AO 0235+164 in 2006 December: Shock-in-Jet Interpretation

We present the results of polarimetric ($R$ band) and multicolor photometric ($BVRIJHK$) observations of the blazar AO 0235+16 during an outburst in 2006 December. The data reveal a short timescale of variability (several hours), which…

天体物理学 · 物理学 2009-11-13 V. A. Hagen-Thorn , V. M. Larionov , S. G. Jorstad , A. A. Arkharov , E. I. Hagen-Thorn , N. V. Efimova , L. V. Larionova , A. P. Marscher

Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. III. Probing the Inner Jet through Multiwavelength Correlations

In May 1994 the BL Lac object PKS 2155-304 was observed continuously for ~10 d with IUE and EUVE and for 2 d with ASCA, as well as with ROSAT and with ground- based radio, IR, and optical telescopes. The light curves show a well-defined…

天体物理学 · 物理学 2009-10-30 C. Megan Urry , A. Treves , L. Maraschi , H. Marshall , T. Kii , G. Madejski , S. Penton , J. E. Pesce , E. Pian , A. Celotti , R. Fujimoto , F. Makino , C. Otani , R. M. Sambruna , K. Sasaki , J. M. Shull , P. Smith , T. Takahashi , M. Tashiro

S5 0716+714 : GeV variability study

The GeV observations by Fermi-LAT give us the opportunity to characterize the high-energy emission (100 MeV - 300 GeV) variability properties of the BL Lac object S5 0716+714. In this study, we performed flux and spectral analysis of more…

高能天体物理现象 · 物理学 2015-06-15 B. Rani , T. P. Krichbaum , B. Lott , L. Fuhrmann , J. A. Zensus

On the classification of flaring states of blazar

The time evolution of the electromagnetic emission from blazars, in particular high frequency peaked sources (HBLs), displays irregular activity not yet understood. In this work we report a methodology capable of characterizing the time…

高能天体物理现象 · 物理学 2010-11-02 E. Resconi , D. Franco , A. Gross , L. Costamante , E. Flaccomio

Exploring the nature of broadband variability in the FSRQ 3C 273

Detailed investigation of broadband flux variability in the blazar 3C 273 allows us to probe the location and size of emission regions and their physical conditions. We report the results on correlation studies of the flaring activity…

高能天体物理现象 · 物理学 2016-05-11 C. Chidiac , B. Rani , T. P. Krichbaum , E. Angelakis , L. Fuhrmann , I. Nestoras , J. A. Zensus , A. Sievers , H. Ungerechts , R. Itoh , Y. Fukazawa , M. Uemura , M. Sasada , M. Gurwell , E. Fedorova

A Search for Intraday Variability in the Blazar PKS 2005-489

Rapid, multi-color optical monitoring carried out for a multiwavelength campaign during 22-27 August 2000 is presented for the bright and variable BL Lac object PKS 2005-489. Previous multiwavelength monitoring campaigns of PKS 2005-489…

天体物理学 · 物理学 2008-11-26 T. A. Rector , E. S. Perlman

Characterizing the Variable X-ray and UV-Optical Flux Behavior of Blazars

The variability of blazars in the X-ray and optical regions informs both the physics of their emitting region and places demands on the observer if a program requires that the object be bright or faint. The extensive simultaneous X-ray and…

高能天体物理现象 · 物理学 2022-05-31 Kaitlyn E. Moo , Joel N. Bregman , Mark T. Reynolds

Twenty years of blazar monitoring with the INAF radio telescopes

The extreme variability of blazars, in both timescale and amplitude, is generally explained as the effect of a relativistic jet closely aligned to the observer's line-of-sight. Due to causality arguments, variability characteristics…

高能天体物理现象 · 物理学 2025-10-15 N. Marchili , S. Righini , M. Giroletti , C. M. Raiteri , R. P. Giri , M. I. Carnerero , M. Villata , U. Bach , P. Cassaro , E. Liuzzo , C. S. Buemi , P. Leto , C. Trigilio , G. Umana , M. Bonato , B. Patricelli , A. Stamerra

The relation between Simulated Multiwavelength Blazar Variability and Stochastic Fluctuations

Blazars exhibit multiwavelength variability, a phenomenon whose underlying mechanisms remain elusive. This study investigates the origin of such variability through leptonic blazar emission simulations, focusing on stochastic fluctuations…

高能天体物理现象 · 物理学 2024-09-10 Hannes Thiersen , Michael Zacharias , Markus Böttcher

Long Term Multi-band Near Infra-Red Variability of the Blazar OJ 287 during 2007--2021

We present the most extensive and well-sampled long-term multi-band near-infrared (NIR) temporal and spectral variability study of OJ 287, considered to be the best candidate binary supermassive black hole blazar. These observations were…

高能天体物理现象 · 物理学 2022-06-29 Alok C. Gupta , Pankaj Kushwaha , L. Carrasco , Haiguang Xu , Paul J. Wiita , G. Escobedo , A. Porras , E. Recillas , Y. D. Mayya , V. Chavushyan , Beatriz Villarroel , Zhongli Zhang

Intraday Radio Variability in Active Galactic Nuclei

Rapid flux density variations on timescales of the order of a day or less (Intraday Variability, IDV) in the radio regime are a common phenomenon within the blazar class. Observations with the 100m telescope of the MPIfR showed that the…

天体物理学 · 物理学 2009-10-31 A. Kraus , A. Witzel , T. P. Krichbaum