1. A Search for X-Ray/UV Correlation in the Reflection-dominated Seyfert 1 Galaxy Markarian 1044
- Author
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Samuzal Barua, Oluwashina K. Adegoke, Ranjeev Misra, Pramod Pawar, V. Jithesh, and Biman J. Medhi
- Subjects
High energy astrophysics ,Seyfert galaxies ,Active galactic nuclei ,X-ray active galactic nuclei ,Astrophysics ,QB460-466 - Abstract
Correlated variability between coronal X-rays and disk optical/UV photons provides a very useful diagnostic of the interplay between the different regions around an active galactic nucleus (AGN) and how they interact. AGNs that reveal strong X-ray reflection in their spectra should normally exhibit optical/UV to X-ray correlation consistent with reprocessing—whereas the optical/UV emission lags behind the X-rays. While such correlated delay has been seen in some sources, it has been absent in others. Mrk 1044 is one such source that has been known to reveal strong X-ray reflection in its spectra. In our analysis of three long XMM-Newton and several Swift observations of the source, we found no strong evidence for correlation between its UV and X-ray lightcurves both on short and long timescales. Among other plausible causes for the nondetection, we posit that higher X-ray variability rather than UV and strong general relativistic effects close to the black hole may also be responsible. We also present results from the spectral analysis based on XMM-Newton and NuSTAR observations, which show the strong soft X-ray excess and iron K α line in the 0.3–50 keV spectrum that can be described by relativistic reflection.
- Published
- 2023
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