Details

Autor(en) / Beteiligte

• Lasker, Ronald
• Greene, Jenny E
• Seth, Anil
• van de Ven, Glenn
• Braatz, James A
• Henkel, Christian
• Lo, K Y

Titel

THE BLACK HOLE–BULGE MASS RELATION IN MEGAMASER HOST GALAXIES

Ist Teil von

• The Astrophysical journal, 2016-07, Vol.825 (1), p.3-3

Ort / Verlag

United States

Erscheinungsjahr

2016

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present Hubble Space Telescope(HST) images for nine megamaser disk galaxies with the primary goal of studying photometric BH-galaxy scaling relations. The megamaser disks provide the highest-precision extragalactic BH mass measurements, while our high-resolution HST imaging affords us the opportunity to decompose the complex nuclei of their late-type hosts in detail. Based on the morphologies and shapes of the galaxy nuclei, we argue that most of these galaxies' central regions contain secularly evolving components (pseudo-bulges), and in many cases we photometrically identify co-existing "classical" bulge components as well. Using these decompositions, we draw the following conclusions. (1) The megamaser BH masses span two orders of magnitude (10 super(6)-10 super(8)M sub([middot in circle])) while the stellar mass of their spiral host galaxies are all ~10 super(11)M sub([middo t in circle]) within a factor of three. (2) The BH masses at a given bulge mass or total stellar mass in the megamaser host spiral galaxies tend to be lower than expected when compared to an extrapolation of the BH-bulge relation based on early-type galaxies. (3) The observed large intrinsic scatter of BH masses in the megamaser host galaxies raises the question of whether scaling relations exist in spiral galaxies.