Gravitational Redshift of Emission Lines in the AGN Spectra
Nata\v{s}a Bon, Edi Bon, Paola Marziani, Predrag Jovanovi\'c
TL;DR
This paper reviews the detection of gravitational redshift in AGN emission lines and tests its consistency as the cause of observed spectral shifts using a sample of luminous quasars with accretion disk models.
Contribution
It provides an overview of gravitational redshift detections in AGN spectra and evaluates its role in spectral line shifts with a large quasar sample and accretion disk modeling.
Findings
Gravitational redshift can explain redward shifts in AGN spectra.
Analysis supports the physical origin of observed shifts as gravitational redshift.
Modeling aligns with the hypothesis of massive black holes causing spectral shifts.
Abstract
The detection of gravitationally redshifted optical emission lines has been reported just for a few active galaxies. In this paper we give a short overview of studies that analyzed or exploited the detection of the gravitational redshift in optical AGN spectra. In addition, we tested the consistency of gravitational redshift as the physical origin of the redward shifts observed in their spectra using a sample of 50 Hamburg-ESO intermediate to high redshift quasars that are among the most luminous quasars known ( erg/s), and are expected to host very massive black holes. To this aim we modeled the line profile with accretion disk models around a black hole.
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