Active galactic nuclei and gravitational redshifts ...

• Main Authors: Padilla, N. D., Carneiro, S., Chaves-Montero, J., Donzelli, C. J., Pigozzo, C., Colazo, P., Alcaniz, J. S.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2023
• Subjects: Astrophysics of Galaxies astro-ph.GA; Cosmology and Nongalactic Astrophysics astro-ph.CO; FOS Physical sciences; sami
• Online Access: https://dx.doi.org/10.48550/arxiv.2304.13036; https://arxiv.org/abs/2304.13036

Context: Gravitational redshift is a classical effect of Einstein's General Relativity, already measured in stars, quasars and clusters of galaxies. Aims: We here aim to identify the signature of gravitational redshift in the emission lines of active galaxies due to supermassive black holes, and compare to what is found for inactive galaxies. Methods: Using the virial theorem, we estimate gravitational redshifts for quasars from the 14th data release of the Sloan Digital Sky Survey, and compare these with measured ones from the difference between the redshifts of emission lines of Sydney Australian Astronomical Observatory Multi-object Integral Field (SAMI) galaxies in central and outer annuli of their integral field spectra. Results: Firstly, from the full width at half maximum of $H_β$ lines of 57 Seyfert type I galaxies of the AGN Black Hole Mass Database, we derive a median gravitational redshift $z_g = 1.18 \times 10^{-4}$. Expanding this analysis to 86755 quasars from DR14 of SDSS we have a median ... : Accepted for publication in A&A, 7 pages, 6 figures ...