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Large Stellar Disks in Small Elliptical Galaxies

Rix, Hans-Walter; Carollo, C Marcella; Freeman, Kenneth

Description

We present stellar kinematics along the principal axes of seven elliptical galaxies less luminous than MB = -19.5, which extend beyond the half-light radii for all systems in this photometrically selected sample. At large radii, the kinematics not only confirm that rotation and "diskiness" are important in faint elliptical galaxies, as was previously known, but show that rotation dominates: the stars at large galactocentric distances have (Vlσ)max ∼ 2, similar to the disks in bona fide S0...[Show more]

dc.contributor.authorRix, Hans-Walter
dc.contributor.authorCarollo, C Marcella
dc.contributor.authorFreeman, Kenneth
dc.date.accessioned2015-12-13T23:40:28Z
dc.date.available2015-12-13T23:40:28Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/94490
dc.description.abstractWe present stellar kinematics along the principal axes of seven elliptical galaxies less luminous than MB = -19.5, which extend beyond the half-light radii for all systems in this photometrically selected sample. At large radii, the kinematics not only confirm that rotation and "diskiness" are important in faint elliptical galaxies, as was previously known, but show that rotation dominates: the stars at large galactocentric distances have (Vlσ)max ∼ 2, similar to the disks in bona fide S0 galaxies. A comparison with published simulations of dissipationless mergers is not straightforward. Yet, within Re, the observed galaxies seem to rotate somewhat faster than 3:1 merger remnants, arguing against major mergers as the dominant mechanism in the final shaping of low-luminosity elliptical galaxies and favoring instead the dissipative formation of a disk.
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Galaxies: elliptical and lenticular, cD; Galaxies: evolution; Galaxies: formation; Galaxies: kinematics and dynamics; Galaxies: structure
dc.titleLarge Stellar Disks in Small Elliptical Galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume513
dc.date.issued1999
local.identifier.absfor020203 - Particle Physics
local.identifier.ariespublicationMigratedxPub24089
local.type.statusPublished Version
local.contributor.affiliationRix, Hans-Walter, Max Planck Institute for Astronomy
local.contributor.affiliationCarollo, C Marcella, Johns Hopkins University
local.contributor.affiliationFreeman, Kenneth, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.startpageL25
local.bibliographicCitation.lastpage28
dc.date.updated2015-12-12T09:29:16Z
local.identifier.scopusID2-s2.0-0033095093
CollectionsANU Research Publications

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