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Compact nuclear objects and properties of their parent galaxies

Published online by Cambridge University Press:  25 July 2014

Anatoly V. Zasov  and
Anatoly M. Cherepashchuk
Anatoly V. Zasov
Affiliation:
Sternberg Astronomical Institute, University Prospect, 13, Moscow, Russia
Anatoly M. Cherepashchuk
Affiliation:
Sternberg Astronomical Institute, University Prospect, 13, Moscow, Russia
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Abstract

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We consider the relationship between the masses of the compact nuclear objects in the centers of disky galaxies – supermassive black holes (SMBHs) or nuclear star clusters (NCs) – and such parameters as the maximal velocity of rotation Vmax, obtained from the rotation curves, indicative dynamical mass M25, and the color index (B−V) of their parent galaxies. It was found that the mass of nuclear clusters Mnc correlates more closely with the velocity of rotation and total mass of galaxies than the mass of supermassive black holes Mbh. The dependence of masses of the central objects on the color index is bimodal: galaxies of the red group (red-sequence), which have (B−V) > 0.6−0.7, differ from bluer galaxies, by higher values of Mbh for similar host-galaxy parameters. In contrast, in the diagrams for nuclear clusters the “blue” and “red” galaxies form unified sequences. It agrees with scenarios in which most red-group galaxies form as a result of loss of interstellar gas in a stage of high nuclear activity in galaxies whose central black-hole masses are high, exceeding 106 − 107M⊙ (depending on the total mass of the galaxy). The active growth of nuclear star clusters possibly begun after the violent AGN activity.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 379 - 382
Copyright
Copyright © International Astronomical Union 2014 

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