Recent Swift Monitoring of Mrk 817 Reveals an Extremely Low Flux State
Abstract
Mrk 817 is a Seyfert 1.2 galaxy (Koss et al. 2017) at a redshift of 0.03145 (Strauss & Huchra 1988). The mass of its central black hole is (4.9 +/- 0.8) E+7 solar masses (Peterson et al. 2004).
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- April 2022
- Bibcode:
- 2022ATel15316....1Z
- Keywords:
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- AGN;
- Black Hole