SIMBAD references

2017ApJ...844..165P - Astrophys. J., 844, 165-165 (2017/August-1)

Circumnuclear structures in megamaser host galaxies.

PJANKA P., GREENE J.E., SETH A.C., BRAATZ J.A., HENKEL C., LO F.K.Y. and LASKER R.

Abstract (from CDS):

Using the Hubble Space Telescope, we identify circumnuclear (100-500 pc scale) structures in nine new H2O megamaser host galaxies to understand the flow of matter from kpc-scale galactic structures down to the supermassive black holes (SMBHs) at galactic centers. We double the sample analyzed in a similar way by Greene et al. and consider the properties of the combined sample of 18 sources. We find that disk-like structure is virtually ubiquitous when we can resolve <200 pc scales, in support of the notion that non-axisymmetries on these scales are a necessary condition for SMBH fueling. We perform an analysis of the orientation of our identified nuclear regions and compare it with the orientation of megamaser disks and the kpc-scale disks of the hosts. We find marginal evidence that the disk-like nuclear structures show increasing misalignment from the kpc-scale host galaxy disk as the scale of the structure decreases. In turn, we find that the orientation of both the ∼100 pc scale nuclear structures and their host galaxy large-scale disks is consistent with random with respect to the orientation of their respective megamaser disks.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: nuclei - galaxies: structure - ISM: kinematics and dynamics - masers - masers

Simbad objects: 20

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2019.09.23-21:04:39

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