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An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750.
- Source :
-
Astrophysical Journal . Aug2020, Vol. 897 Issue 2, p1-31. 31p. - Publication Year :
- 2020
-
Abstract
- 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 × 105 M⊙. Keplerian rotation curves fitted to these data yield enclosed masses between 4.1 × 104M⊙ and 1.4 × 105M⊙, with a mode of 7.2 × 104M⊙. Fitting the optical spectrum, we measure a nuclear stellar velocity dispersion km s−1. From near-infrared photometry, we fit a bulge mass of (7.3 ± 2.7) × 108M⊙ and a stellar mass of 1.4 × 1010M⊙. 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 FROM AUTHOR]
- Subjects :
- *BLACK holes
*GALACTIC bulges
*STELLAR mass
*ACTIVE galactic nuclei
*GALAXIES
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 897
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 144876020
- Full Text :
- https://doi.org/10.3847/1538-4357/ab9944