The (black hole mass)-(color) relations for early- and late-type galaxies: red and blue sequences
arXiv:2006.10128 · doi:10.3847/1538-4357/ab9dff
Abstract
[Abridged] Tight correlations between supermassive black hole (SMBH) mass () and the properties of the host galaxy have useful implications for our understanding of the growth of SMBHs and evolution of galaxies. Here, we present newly observed correlations between and the host galaxy total UV [3.6] color (, Pearson's r = ) for a sample of 67 galaxies (20 early-type galaxies and 47 late-type galaxies) with directly measured in the GALEX/SG survey. The colors are carefully measured in a homogeneous manner using the galaxies' FUV, NUV and 3.6 $\micron$ magnitudes and their multi-component structural decompositions in the literature. We find that more massive SMBHs are hosted by (early- and late-type) galaxies with redder colors, but the relations for the two morphological types have slopes that differ at level. Early-type galaxies define a red sequence in the diagrams, while late-type galaxies trace a blue sequence. Within the assumption that the specific star formation rate of a galaxy (sSFR) is well traced by , it follows that the SMBH masses for late-type galaxies exhibit a steeper dependence on sSFR than those for early-type galaxies. The and relations for the sample galaxies reveal a comparable level of vertical scatter in the log direction, roughly more than the vertical scatter of the relation. Our relations suggest different channels of SMBH growth for early- and late-type galaxies, consistent with their distinct formation and evolution scenarios.
27 pages, 8 figures, 6 tables, accepted for publication in ApJ
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