Kinematics of Ten Early-Type Galaxies from HST and Ground-Based Spectroscopy

Дата и время публикации : 2003-06-23T18:54:09Z

Авторы публикации и институты :
Jason Pinkney
Karl Gebhardt
Ralf Bender
Gary Bower
Alan Dressler
S. M. Faber
Alexei V. Filippenko
Richard Green
Luis C. Ho
John Kormendy
Tod Lauer
John Magorrian
Douglas Richstone
Scott Tremaine

Оригинал статьи :http://arxiv.org/abs/astro-ph/0306464v1

Скачать pdf : http://arxiv.org/pdf/astro-ph/0306464v1

Ссылка на журнал-издание: Astrophys.J.596:903-929,2003
Коментарии к статье: 43 pages, accepted for publication in the Astrophysical Journal, high resolution version found at http://hoku.as.utexas.edu/~gebhardt/pinkney.ps
Первичная категория: astro-ph

Все категории : astro-ph

Краткий обзор статьи: We present stellar kinematics for a sample of 10 early-type galaxies observed using the STIS aboard the Hubble Space Telescope, and the Modular Spectrograph on the MDM Observatory 2.4-m telescope. The spectra are used to derive line-of-sight velocity distributions (LOSVDs) of the stars using a Maximum Penalized Likelihood method. We use Gauss-Hermite polynomials to parameterize the LOSVDs and find predominantly negative h4 values (boxy distributions) in the central regions of our galaxies. One galaxy, NGC 4697, has significantly positive central h4 (high tail weight). The majority of galaxies have a central velocity dispersion excess in the STIS kinematics over ground-based velocity dispersions. The galaxies with the strongest rotational support, as quantified with v_MAX/sigma_STIS, have the smallest dispersion excess at STIS resolution. The best-fitting, general, axisymmetric dynamical models (described in a companion paper) require black holes in all cases, with masses ranging from 10^6.5 to 10^9.3 Msun. We replot these updated masses on the BH/sigma relation, and show that the fit to only these 10 galaxies has a slope consistent with the fits to larger samples. The greatest outlier is NGC 2778, a dwarf elliptical with relatively poorly constrained black hole mass. The two best candidates for pseudobulges, NGC 3384 and 7457, do not deviate significantly from the established relation between black hole and sigma. Neither do the three galaxies which show the most evidence of a recent merger, NGC 3608, 4473, and 4697.

Category: Physics