Rapid X-ray Variability in Mkn 421 during a Multiwavelength Campaign
In: Monthly Notices of the Royal Astronomical Society, 2022, Volume 513, Issue 2, pp.1662-1679; (2022)
Online
report
The study of short-term variability properties in AGN jets has the potential to shed light on their particle acceleration and emission mechanisms. We report results from a four-day coordinated multi-wavelength campaign on the highly-peaked blazar (HBL) Mkn 421 in 2019 January. We obtained X-ray data from AstroSAT, BVRI photometry with the Whole Earth Blazar Telescope (WEBT), and TeV data from FACT to explore short-term multi-wavelength variability in this HBL. The X-ray continuum is rapidly variable on time-scales of tens of ks. Fractional variability amplitude increases with energy across the synchrotron hump, consistent with previous studies; we interpret this observation in the context of a model with multiple cells whose emission spectra contain cutoffs that follow a power-law distribution. We also performed time-averaged and time-resolved (time-scales of 6 ks) spectral fits; a broken power-law model fits all spectra well; time-resolved spectral fitting reveals the usual hardening when brightening behaviour. Intra-X-ray cross correlations yield evidence for the 0.6-0.8 keV band to likely lead the other bands by an average of 4.6 +- 2.6 ks, but only during the first half of the observation. The source displayed minimal night-to-night variability at all wavebands thus precluding significant interband correlations during our campaign. The broadband SED is modeled well with a standard one-zone leptonic model, yielding jet parameters consistent with those obtained from previous SEDs of this source.
Comment: This article has been accepted for publication in The Monthly Notices of the Royal Astronomical Society (2022), and is published in Volume 513, Issue 2, pp.1662-1679. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. 19 pages; 12 figures
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Rapid X-ray Variability in Mkn 421 during a Multiwavelength Campaign
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Autor/in / Beteiligte Person: | Markowitz, Alex G. ; Nalewajko, Krzysztof ; Bhatta, Gopal ; Dewangan, Gulab C. ; Chandra, Sunil ; Dorner, Daniela ; Schleicher, Bernd ; Pajdosz-Smierciak, Urszula ; Stawarz, Lukasz ; Zola, Staszek ; Ostrowski, Michal ; Carosati, Daniele ; Krishnan, Saikruba ; Bachev, Rumen ; Benitez, Erika ; Gazeas, Kosmas ; Hiriart, David ; Hu, Shao-Ming ; Larionov, Valeri ; Marchini, Alessandro ; Matsumoto, Katsura ; Nikiforova, A. A. ; Pursimo, Tapio ; Raiteri, Claudia M. ; Reichart, Daniel E. ; Rodriguez, Diego ; Semkov, Evgeni ; Strigachev, Anton ; Sugiura, Yuki ; Villata, Massimo ; Webb, James R. ; Arbet-Engels, Axel ; Baack, Dominik ; Balbo, Matteo ; Biland, Adrian ; Bretz, Thomas ; Buss, Jens ; Eisenberger, Laura ; Elsaesser, Dominik ; Hildebrand, Dorothee ; Iotov, Roman ; Kalenski, Adelina ; Mannheim, Karl ; Mitchell, Alison ; Neise, Dominik ; Noethe, Maximilian ; Paravac, Aleksander ; Rhode, Wolfgang ; Sliusar, Vitalii ; Walter, Roland |
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Quelle: | Monthly Notices of the Royal Astronomical Society, 2022, Volume 513, Issue 2, pp.1662-1679; (2022) |
Veröffentlichung: | 2022 |
Medientyp: | report |
DOI: | 10.1093/mnras/stac917 |
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