The Awakening Beast in the Seyfert 1 Galaxy KUG 1141+371
Abstract
KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous flux increase in the optical and UV bands in the past decade. For instance, the latest Swift observation in 2019 shows that the UVW1 flux of KUG 1141+371 has increased by over one order of magnitude since 2009. Meanwhile, the soft X-ray flux of KUG 1141+371 also shows a steady increase by one order of magnitude from 2007 to 2017, and starts decaying slowly in 2019. The significant multi-wavelength luminosity change is likely due to a boost of mass accretion rate. We will present detailed multi-epoch X-ray spectral analysis focusing on the variability of the X-ray continuum emission and the puzzling soft excess emission. In addition, our SED models also suggest a simultaneous increase of disc temperature and a receding inner radius of the disc along with the increasing accretion rate. In the end, we will also discuss possible connection between KUG 1141+371 and stellar-mass black hole transients in outburst.
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1575J