The link between star-formation and supermassive black hole properties

George Mountrichas; Veronique Buat

doi:10.1051/0004-6361/202347392

paper

The link between star-formation and supermassive black hole properties

arXiv:2309.15909 · doi:10.1051/0004-6361/202347392

Abstract

It is well known that supermassive black holes (SMBHs) and their host galaxies co-evolve. AGN feedback plays an important role on this symbiosis. To study the effect of the AGN feedback on the host galaxy, a popular method is to study the star-formation rate (SFR) as a function of the X-ray luminosity (L $_{X}$ ). However, hydrodynamical simulations suggest that the cumulative impact of AGN feedback on a galaxy is encapsulated in the mass of the SMBH, M $_{B H}$ , rather than the L $_{X}$ . In this study, we compare the SFR of AGN and non-AGN galaxies as a function of L $_{X}$ , M $_{B H}$ , Eddington ratio (n $_{E dd}$ ) and specific black hole accretion rate ( $λ_{s B H A R}$ ). For that purpose, we use 122 X-ray AGN in the XMM-XXL field and 3371 galaxies from the VIPERS survey and calculate the SFR $_{n or m}$ parameter, defined as the ratio of the SFR of AGN to the SFR of non-AGN galaxies with similar stellar mass, M $_{*}$ , and redshift. Our datasets span a redshift range of $0.5 \leq z \leq 1.2$ . The results show that the correlation between SFR $_{n or m}$ and M $_{B H}$ is stronger compared to that between SFR $_{n or m}$ and L $_{X}$ . A weaker correlation is found between SFR $_{n or m}$ and $λ_{s B H A R}$ . No correlation is detected between SFR $_{n or m}$ and n $_{E dd}$ . These results corroborate the idea that the M $_{B H}$ is a more robust tracer of the cumulative impact of the AGN feedback compared to the instantaneous accretion rate (L $_{X}$ ) and, thus, a better predictive parameter of the changes of the SFR of the host galaxy.

A&A accepted, 10 pages, 4 figures, 6 tables

The link between star-formation and supermassive black hole properties

Abstract

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