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Broad-band spectral analysis of Mrk 926 using multi-epoch X-ray observations

Chalise, S. and Lohfink, A. M. and Chauhan, J. and Russell, T. D. and Buisson, D. J. K. and Mallick, L. (2022) Broad-band spectral analysis of Mrk 926 using multi-epoch X-ray observations. Monthly Notices of the Royal Astronomical Society, 517 (4). pp. 4788-4794. ISSN 0035-8711. doi:10.1093/mnras/stac2953.

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The X-ray spectra of some active galactic nuclei (AGNs) show a soft X-ray excess, emission in excess to the extrapolated primary X-ray continuum below 2 keV. Recent studies have shown that this soft excess can be described well as originating from either a relativistic ionized reflection, the extreme blurring of the reprocessed emission from the innermost region of the accretion disc, or Comptonization from an optically thick and warm region called the ‘warm corona’, in which electron scattering is the dominant source of opacity. To constrain the origin of the soft excess in the Seyfert 1 galaxy Mrk 926, we carry out a multi-epoch X-ray spectral study using observations from Suzaku (2009), XMM–Newton and NuSTAR (2016), and NuSTAR and Swift-XRT (2021). The broad-band X-ray spectra of Mrk 926 contains a thermally Comptonized primary continuum, a variable soft excess, and distant reflection. We find that in Mrk 926 as in so many sources, it is difficult to make a definite statement as to what is causing the observed soft excess. A warm coronal-like component is slightly preferred by the data but a reflection origin is also possible. Using archival radio data, we detect an optically thin radio component in our broad-band study of Mrk 926. While this component is consistent with an optically thin radio jet, future multiwavelength observations including high spatial resolution radio observations at multiple frequencies are required to probe the origin of the radio emission in more detail.

Item Type:Article
Related URLs:
URLURL TypeDescription
Chalise, S.0000-0002-5641-0442
Chauhan, J.0000-0003-0330-1901
Russell, T. D.0000-0001-6958-8891
Buisson, D. J. K.0000-0002-5341-6929
Mallick, L.0000-0001-8624-9162
Additional Information:This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. This research has also made use of the NASA/IPAC Extragalactic Database (NED), which is funded by the National Aeronautics and Space Administration and operated by the California Institute of Technology. We would like to thank Javier García and Andy Fabian for helpful discussions.
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Issue or Number:4
Record Number:CaltechAUTHORS:20230123-451320900.19
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118892
Deposited By: Research Services Depository
Deposited On:30 Jan 2023 19:35
Last Modified:30 Jan 2023 19:35

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