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Title: CORES AND THE KINEMATICS OF EARLY-TYPE GALAXIES

Abstract

I have combined the Emsellem et al. ATLAS{sup 3D} rotation measures of a large sample of early-type galaxies with Hubble Space Telescope based classifications of their central structure to characterize the rotation velocities of galaxies with cores. 'Core galaxies' rotate slowly, while 'power-law galaxies' (galaxies that lack cores) rotate rapidly, confirming the analysis of Faber et al. Significantly, the amplitude of rotation sharply discriminates between the two types in the -19 > M{sub V} > -22 domain over which the two types coexist. The slow rotation in the small set of core galaxies with M{sub V} > -20, in particular, brings them into concordance with the more massive core galaxies. The ATLAS{sup 3D} 'fast-rotating' and 'slow-rotating' early-type galaxies are essentially the same as power-law and core galaxies, respectively, or the Kormendy and Bender two families of elliptical galaxies based on rotation, isophote shape, and central structure. The ATLAS{sup 3D} fast rotators do include roughly half of the core galaxies, but their rotation amplitudes are always at the lower boundary of that subset. Essentially, all core galaxies have ATLAS{sup 3D} rotation amplitudes {lambda}{sub R{sub e/2}}{<=}0.25, while all galaxies with {lambda}{sub R{sub e/2}}>0.25 and figure eccentricity >0.2 lack cores. Both figure rotationmore » and the central structure of early-type galaxies should be used together to separate systems that appear to have formed from 'wet' versus 'dry' mergers.« less

Authors:
 [1]
  1. National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726 (United States)
Publication Date:
OSTI Identifier:
22086443
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTRONOMY; ASTROPHYSICS; CLASSIFICATION; COSMOLOGY; GALAXIES; GALAXY NUCLEI; PHOTOMETRY; ROTATION; SHAPE; SPACE; TELESCOPES; VELOCITY

Citation Formats

Lauer, Tod R. CORES AND THE KINEMATICS OF EARLY-TYPE GALAXIES. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/64.
Lauer, Tod R. CORES AND THE KINEMATICS OF EARLY-TYPE GALAXIES. United States. doi:10.1088/0004-637X/759/1/64.
Lauer, Tod R. Thu . "CORES AND THE KINEMATICS OF EARLY-TYPE GALAXIES". United States. doi:10.1088/0004-637X/759/1/64.
@article{osti_22086443,
title = {CORES AND THE KINEMATICS OF EARLY-TYPE GALAXIES},
author = {Lauer, Tod R.},
abstractNote = {I have combined the Emsellem et al. ATLAS{sup 3D} rotation measures of a large sample of early-type galaxies with Hubble Space Telescope based classifications of their central structure to characterize the rotation velocities of galaxies with cores. 'Core galaxies' rotate slowly, while 'power-law galaxies' (galaxies that lack cores) rotate rapidly, confirming the analysis of Faber et al. Significantly, the amplitude of rotation sharply discriminates between the two types in the -19 > M{sub V} > -22 domain over which the two types coexist. The slow rotation in the small set of core galaxies with M{sub V} > -20, in particular, brings them into concordance with the more massive core galaxies. The ATLAS{sup 3D} 'fast-rotating' and 'slow-rotating' early-type galaxies are essentially the same as power-law and core galaxies, respectively, or the Kormendy and Bender two families of elliptical galaxies based on rotation, isophote shape, and central structure. The ATLAS{sup 3D} fast rotators do include roughly half of the core galaxies, but their rotation amplitudes are always at the lower boundary of that subset. Essentially, all core galaxies have ATLAS{sup 3D} rotation amplitudes {lambda}{sub R{sub e/2}}{<=}0.25, while all galaxies with {lambda}{sub R{sub e/2}}>0.25 and figure eccentricity >0.2 lack cores. Both figure rotation and the central structure of early-type galaxies should be used together to separate systems that appear to have formed from 'wet' versus 'dry' mergers.},
doi = {10.1088/0004-637X/759/1/64},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}