Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 449, Issue 2, Pages 1470-1485Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv387
Keywords
galaxies: active; galaxies: interactions; galaxies: nuclei
Categories
Funding
- NASA [ATP NNX10AC84G]
- SAO [TM1-12007X]
- NSF [AST 1107675]
- European Community [PCIG10-GA-2011-303609]
- Israel Science Foundation [284/13]
- National Science Foundation through the Kavli Institute for Theoretical Physics [NSF PHY11-25915]
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We present a new suite of hydrodynamical simulations and use it to study, in detail, black hole and galaxy properties. The high time, spatial and mass resolution, and realistic orbits and mass ratios, down to 1: 6 and 1: 10, enable us to meaningfully compare star formation rate (SFR) and BH accretion rate (BHAR) time-scales, temporal behaviour, and relative magnitude. We find that (i) BHAR and galaxy-wide SFR are typically temporally uncorrelated, and have different variability time-scales, except during the merger proper, lasting similar to 0.2-0.3 Gyr. BHAR and nuclear (<100 pc) SFR are better correlated, and their variability are similar. Averaging over time, the merger phase leads typically to an increase by a factor of a few in the BHAR/SFR ratio. (ii) BHAR and nuclear SFR are intrinsically proportional, but the correlation lessens if the long-term SFR is measured. (iii) Galaxies in the remnant phase are the ones most likely to be selected as systems dominated by an active galactic nucleus, because of the long time spent in this phase. (iv) The time-scale over which a given diagnostic probes the SFR has a profound impact on the recovered correlations with BHAR, and on the interpretation of observational data.
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