Black Hole Mass Estimation of a Background Quasar in the Vicinity of the cD Galaxy Holm 15A

Abstract

This study analyzes spectra from the central region of the galaxy cluster Abell 85 observed with GTC/OSIRIS, focusing on the cD galaxy Holm 15A and the point-like X-ray source SDSS J004150.75-091824.3, projected $13.74\arcsec$ from Holm 15A. For the latter, we found it is a background quasar with a redshift of $1.56386\pm 0.00397$, ruling out the possibility of it being a rogue BH gravitationally bound to Holm 15A. In addition, using single-epoch spectroscopy, we report that the quasar J004150 hosts a Supermassive Black Hole (SMBH) with a mass of $\log (M_{\text{BH}}/{\mathrm{M}}_{\odot })=8.72\pm 0.26$.

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