# Black hole accretion versus star formation rate: theory confronts observations

Abstract : We use a suite of hydrodynamical simulations of galaxy mergers to compare star formation rate (SFR) and black hole accretion rate (BHAR) for galaxies before the interaction (stochastic' phase), during the merger' proper, lasting ∼0.2-0.3 Gyr, and in the `remnant' phase. We calculate the bivariate distribution of SFR and BHAR and define the regions in the SFR-BHAR plane that the three phases occupy. No strong correlation between BHAR and galaxy-wide SFR is found. A possible exception are galaxies with the highest SFR and the highest BHAR. We also bin the data in the same way used in several observational studies, by either measuring the mean SFR for AGN in different luminosity bins, or the mean BHAR for galaxies in bins of SFR. We find that the apparent contradiction or SFR versus BHAR for observed samples of AGN and star-forming galaxies is actually caused by binning effects. The two types of samples use different projections of the full bivariate distribution, and the full information would lead to unambiguous interpretation. We also find that a galaxy can be classified as AGN-dominated up to 1.5 Gyr after the merger-driven starburst took place. Our study is consistent with the suggestion that most low-luminosity AGN hosts do not show morphological disturbances.
Keywords :
Document type :
Journal articles
Domain :

https://hal-insu.archives-ouvertes.fr/insu-03644733
Contributor : Hal Sorbonne Université Gestionnaire Connect in order to contact the contributor
Submitted on : Monday, April 25, 2022 - 11:22:30 AM
Last modification on : Monday, April 25, 2022 - 11:22:31 AM

### File

slv078.pdf
Publisher files allowed on an open archive

### Citation

Marta Volonteri, Pedro R. Capelo, Hagai Netzer, Jillian Bellovary, Massimo Dotti, et al.. Black hole accretion versus star formation rate: theory confronts observations. Monthly Notices of the Royal Astronomical Society: Letters, 2015, 452, pp.L6-L10. ⟨10.1093/mnrasl/slv078⟩. ⟨insu-03644733⟩

Record views