An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750

Ingyin Zaw, Michael J. Rosenthal, Ivan Yu Katkov, Joseph D. Gelfand, Yan Ping Chen, Lincoln J. Greenhill, Walter Brisken, Hind Al Noori

Research output: Contribution to journalArticle

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 1.4×105Me. Keplerian rotation curves fitted to these data yield enclosed masses between 4.1×104Me and 1.4×105Me, with a mode of 7.2×104Me. Fitting the optical spectrum, we measure a nuclear stellar velocity dispersion s =-110.7+13.4 12.1∗kms-1. From near-infrared photometry, we fit a bulge mass of (7.3±2.7)×108Me and a stellar mass of 1.4×1010Me. The mass upper limit of the intermediate-mass BH in IC 750 falls roughly two orders of magnitude below the MBH-∗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.

Original languageEnglish (US)
Article number111
JournalAstrophysical Journal
Volume897
Issue number2
DOIs
StatePublished - Jul 10 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750'. Together they form a unique fingerprint.

  • Cite this

    Zaw, I., Rosenthal, M. J., Katkov, I. Y., Gelfand, J. D., Chen, Y. P., Greenhill, L. J., Brisken, W., & Noori, H. A. (2020). An Accreting, Anomalously Low-mass Black Hole at the Center of Low-mass Galaxy IC 750. Astrophysical Journal, 897(2), [111]. https://doi.org/10.3847/1538-4357/ab9944