Optical spectroscopic observations of intermediate-mass black holes and their host galaxies: the MBH − σ∗ relation
Abstract
Intermediate-mass black holes (IMBHs; MBH < 2·105M⊙) in galaxy centers are cruciel for painting a coherent picture of the formation and growth of supermassive black holes (SMBHs). Using Big Data analysis, we identified 305 IMBH candidates for IMBH and 1623 candidates of 'light-weight' SMBHs (2 · 105Modot < MBH < 106M⊙). For 35 host galaxies from this combined sample with the X-ray-confirmed active galactic nuclei (AGN) we collected and analyzed optical spectroscopic observations. These data show that bulge stellar velocity dispersions (σ∗) lie in the range of 24. . . 118 km/s and do not follow the correlation with MBH established by larger SMBHs indicating that in the 105 − 106M⊙ range the accretion is the prevailing BH growth channel.
- Publication:
-
Astronomy at the Epoch of Multimessenger Studies
- Pub Date:
- 2022
- DOI:
- arXiv:
- arXiv:2201.01078
- Bibcode:
- 2022aems.conf..367G
- Keywords:
-
- cosmology: observations - early universe - galaxies: active - galaxies: nuclei - galaxies: Seyfert - quasars: supermassive black holes;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 5 pages, 7 figures. Astronomy at the epoch of multimessenger studies. Proceedings of the VAK-2021 conference, Aug 23-28, 2021 - Moscow, 2021