The remarkable spectral and flux variability of ESO511-G030 across the years
Abstract
The formerly bright and soft-excess dominated Seyfert 1 ESO 511-G030 had been targeted by XMM-Newton/NuSTAR in 2019. Surprisingly, it was found in an unprecedented low flux level, about 10 times fainter than in archival exposures. Moreover, to the strong drop in the X-ray flux corresponded a comparable decrease in the UV emission. The adoption of both phenomenological and physically-motivated models revealed that the X-ray emission comprises the superposition of three distinct components, a rather flat power-law and two reflection components emerging from hot and cold matter, respectively. Both timing and spectral analyses confirmed the lack of a significant soft-excess in the 2019 data. I will propose the observed drop in the accretion rate (from 2% in 2007 to 0.4% in 2019) as a possible explanation of the absence of the soft-excess and the drop in the UV flux and discuss the fairly hard spectral state observed in 2019 as the result of a photon starved X-ray corona.
- Publication:
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44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.2282M