2020ApJ...897..111Z -
Astrophys. J., 897, 111-111 (2020/July-2)
An accreting, anomalously low-mass black hole at the center of low-mass galaxy IC 750.
ZAW I., ROSENTHAL M.J., KATKOV I.Y., GELFAND J.D., CHEN Y.-P., GREENHILL L.J., BRISKEN W. and AL NOORI H.
Abstract (from CDS):
We present a multiwavelength study of the active galactic nucleus in the nearby (D = 14.1 Mpc) low-mass galaxy IC 750, which has circumnuclear 22 GHz water maser emission. The masers trace a nearly edge-on, warped disk ∼0.2 pc in diameter, coincident with the compact nuclear X-ray source that lies at the base of the ∼kiloparsec-scale extended X-ray emission. The position-velocity structure of the maser emission indicates that the central black hole (BH) has a mass less than 1.4 x 105 M☉. Keplerian rotation curves fitted to these data yield enclosed masses between 4.1 x 104 M☉ and 1.4 x 105 M☉, with a mode of 7.2 x 104 M☉. Fitting the optical spectrum, we measure a nuclear stellar velocity dispersion σ*=110.7–13.4+12.1 km s–1. From near-infrared photometry, we fit a bulge mass of (7.3 ± 2.7) x 108 M☉ and a stellar mass of 1.4 x 1010 M☉. The mass upper limit of the intermediate-mass BH in IC 750 falls roughly two orders of magnitude below the MBH-σ* relation and roughly one order of magnitude below the MBH-MBulge and MBH-M* relations-larger than the relations' intrinsic scatters of 0.58 ± 0.09 dex, 0.69 dex, and 0.65 ± 0.09 dex, respectively. These offsets could be due to larger scatter at the low-mass end of these relations. Alternatively, BH growth is intrinsically inefficient in galaxies with low bulge and/or stellar masses, which causes the BHs to be undermassive relative to their hosts, as predicted by some galaxy evolution simulations.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Dwarf galaxies - Active galactic nuclei - Water masers
VizieR on-line data:
<Available at CDS (J/ApJ/897/111): table4.dat>
Simbad objects:
496
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