Multi-wavelength study of Mrk 421 during a TeV flare

Gokus A, Kreikenbohm A, Leiter K, Bretz T, Dauser T, Dorner D, Elsaesser D, Eppel F, Heßdörfer J, Kadler M, Kraus A, Kreter M, Kreykenbohm I, Langejahn M, Mannheim K, Thalhammer P, Wilms J, Arbet-Engels A, Baack D, Balbo M, Biland A, Buss J, Eisenberger L, Hildebrand D, Iotov R, Kalenski A, Mitchell A, Neise D, Noethe M, Paravac A, Rhode W, Schleicher B, Sliusar V, Walter R (2022)

Publication Type: Conference contribution

Publication year: 2022

Journal

Publisher: Sissa Medialab Srl

Book Volume: 395

Conference Proceedings Title: Proceedings of Science

Event location: Virtual, Berlin, DEU

Abstract

The blazar Mrk 421 shows frequent, short flares in the TeV energy regime. Due to the fast nature of such episodes, we often fail to obtain sufficient simultaneous information about flux variations in several energy bands. To overcome this lack of multi-wavelength (MWL) coverage, especially for the pre- and post-flare periods, we have set up a monitoring program with the FACT telescope (TeV energies) and the Neil Gehrels Swift Observatory (X-rays). On 2019 June 9, Mrk 421 showed a TeV outburst reaching a flux level of more than two times the flux of the Crab Nebula at TeV energies. We acquired simultaneous data in the X-rays with additional observations by XMM-Newton and INTEGRAL. For the first time, we can study a TeV blazar in outburst taking advantage of highly sensitive X-ray data from XMM-Newton and INTEGRAL combined. Our dataset is complemented by pointed radio observations by Effelsberg at GHz frequencies. We present our first results, including the γ-ray and X-ray light curves, a timing analysis of the X-ray data obtained with XMM-Newton , as well as the radio spectra before, during and after the flare.

Authors with CRIS profile

Involved external institutions

Julius-Maximilians-Universität Würzburg Germany (DE) Eidgenössische Technische Hochschule Zürich (ETHZ) / Swiss Federal Institute of Technology in Zurich Switzerland (CH) Technische Universität Dortmund Germany (DE) Max-Planck-Institut für Radioastronomie / Max Planck Institute for Radio Astronomy Germany (DE) Noordwes-Universiteit / North-West University South Africa (ZA) University of Geneva / Université de Genève (UNIGE) Switzerland (CH)

How to cite

APA:

Gokus, A., Kreikenbohm, A., Leiter, K., Bretz, T., Dauser, T., Dorner, D.,... Walter, R. (2022). Multi-wavelength study of Mrk 421 during a TeV flare. In Proceedings of Science. Virtual, Berlin, DEU: Sissa Medialab Srl.

MLA:

Gokus, Andrea, et al. "Multi-wavelength study of Mrk 421 during a TeV flare." Proceedings of the 37th International Cosmic Ray Conference, ICRC 2021, Virtual, Berlin, DEU Sissa Medialab Srl, 2022.

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