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Recent studies show that a universal relation between black-hole (BH) growth and stellar mass ($M_bigstar$) or star formation rate (SFR) is an oversimplification of BH-galaxy co-evolution, and that morphological and structural properties of host galaxies must also be considered. Particularly, a possible connection between BH growth and host-galaxy compactness was identified among star-forming (SF) galaxies. Utilizing $approx 6300$ massive galaxies with $I_{rm 814W}~<~24$ at $z$ $<$ 1.2 in the COSMOS field, we perform systematic partial-correlation analyses to investigate how sample-averaged BH accretion rate ($rm overline{BHAR}$) depends on host-galaxy compactness among SF galaxies, when controlling for morphology and $M_bigstar$ (or SFR). The projected central surface-mass density within 1 kpc, $Sigma_{1}$, is utilized to represent host-galaxy compactness in our study. We find that the $rm overline{BHAR}$-$Sigma_{1}$ relation is stronger than either the $rm overline{BHAR}$-$M_bigstar$ or $rm overline{BHAR}$-SFR relation among SF galaxies, and this $rm overline{BHAR}$-$Sigma_{1}$ relation applies to both bulge-dominated galaxies and galaxies that are not dominated by bulges. This $rm overline{BHAR}$-$Sigma_{1}$ relation among SF galaxies suggests a link between BH growth and the central gas density of host galaxies on the kpc scale, which may further imply a common origin of the gas in the vicinity of the BH and in the central $sim$ kpc of the galaxy. This $rm overline{BHAR}$-$Sigma_{1}$ relation can also be interpreted as the relation between BH growth and the central velocity dispersion of host galaxies at a given gas content, indicating the role of the host-galaxy potential well in regulating accretion onto the BH.
Possible connections between central black-hole (BH) growth and host-galaxy compactness have been found observationally, which may provide insight into BH-galaxy coevolution: compact galaxies might have large amounts of gas in their centers due to th
We use data from large surveys of the local Universe (SDSS+Galaxy Zoo) to show that the galaxy-black hole connection is linked to host morphology at a fundamental level. The fraction of early-type galaxies with actively growing black holes, and there
We present estimates of black hole accretion rates and nuclear, extended, and total star-formation rates for a complete sample of Seyfert galaxies. Using data from the Spitzer Space Telescope, we measure the active galactic nucleus (AGN) luminosity u
We investigate the connection between the star formation rate (SFR) of galaxies and their central black hole accretion rate (BHAR) using the EAGLE cosmological hydrodynamical simulation. We find, in striking concurrence with recent observational stud
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