SIMBAD references

2003ApJ...591..167C - Astrophys. J., 591, 167-184 (2003/July-1)

Galaxy populations and evolution in clusters. IV. Deep H I observations of dwarf elliptical galaxies in the Virgo cluster.


Abstract (from CDS):

In this paper we present deep Arecibo H I and WIYN optical observations of Virgo Cluster dwarf elliptical galaxies. Based on this data we argue that a significant fraction of low-mass galaxies in the Virgo Cluster recently underwent evolution. Our new observations consist of H I 21 cm line observations for 22 classified dE galaxies with optical radial velocities consistent with membership in the Virgo Cluster. Cluster members VCC 390 and VCC 1713 are detected with H I masses M_HI_=6x107 and 8x107 M, respectively, while MHIvalues in the remaining 20 dE galaxies have upper limits as low as ∼5x105 M. We combine our results with those for 26 other Virgo Cluster dE galaxies with H I observations in the literature, seven of which have H I detection claims. New optical images from the WIYN telescope of five of these H I-detected dE galaxies, along with archival data, suggest that seven of the claimed detections are true H I detections, yielding a ~15% detection rate. These H I-detected, classified dE galaxies are preferentially located near the periphery of the Virgo Cluster. Three Virgo dE galaxies have observed H I velocity widths greater than 200 km/s, possibly indicating the presence of a large dark matter content or transient extended H I. We discuss the possible origins of these objects and argue that they originate from field galaxies accreted onto high angular momentum orbits by Virgo in the last few Gyr. As a result of this, we argue, these galaxies are slowly transformed within the cluster by gradual gas-stripping processes, associated truncation of star formation, and passive fading of stellar populations. Low-mass, early-type cluster galaxies are therefore currently being produced as the product of cluster environmental effects. We utilize our results in a simple model to estimate the recent (past 1-3 Gyr) average mass accretion rate into the Virgo Cluster, deriving a value of M{dot}∼50 M/yr.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: ISM

Simbad objects: 61

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