TY - JOUR
T1 - Gas-bearing early-type dwarf galaxies in virgo: Evidence for recent accretion
AU - Hallenbeck, G.
AU - Papastergis, E.
AU - Huang, S.
AU - Haynes, M.P.
AU - Giovanelli, R.
AU - Boselli, A.
AU - Boissier, S.
AU - Heinis, S.
AU - Cortese, Luca
AU - Fabello, S.
PY - 2012
Y1 - 2012
N2 - We investigate the dwarf (M B > -16) galaxies in the Virgo cluster in the radio, optical, and ultraviolet regimes. Of the 365 galaxies in this sample, 80 have been detected in H I by the Arecibo Legacy Fast ALFA survey. These detections include 12 early-type dwarfs (ETDs) that have H I and stellar masses similar to the cluster dwarf irregulars and blue compact dwarfs. In this sample of 12, half have star formation properties similar to late-type dwarfs, while the other half are quiescent-like typical ETDs. We also discuss three possible mechanisms for their evolution: that they are infalling field galaxies that have been or are currently being evolved by the cluster, that they are stripped objects whose gas is recycled, and that the observed H I has been recently reaccreted. Evolution by the cluster adequately explains the star-forming half of the sample, but the quiescent class of ETDs is most consistent with having recently reaccreted their gas. © © 2012. The American Astronomical Society. All rights reserved.
AB - We investigate the dwarf (M B > -16) galaxies in the Virgo cluster in the radio, optical, and ultraviolet regimes. Of the 365 galaxies in this sample, 80 have been detected in H I by the Arecibo Legacy Fast ALFA survey. These detections include 12 early-type dwarfs (ETDs) that have H I and stellar masses similar to the cluster dwarf irregulars and blue compact dwarfs. In this sample of 12, half have star formation properties similar to late-type dwarfs, while the other half are quiescent-like typical ETDs. We also discuss three possible mechanisms for their evolution: that they are infalling field galaxies that have been or are currently being evolved by the cluster, that they are stripped objects whose gas is recycled, and that the observed H I has been recently reaccreted. Evolution by the cluster adequately explains the star-forming half of the sample, but the quiescent class of ETDs is most consistent with having recently reaccreted their gas. © © 2012. The American Astronomical Society. All rights reserved.
U2 - 10.1088/0004-6256/144/3/87
DO - 10.1088/0004-6256/144/3/87
M3 - Article
SN - 0004-6256
VL - 144
SP - 1
EP - 13
JO - Astronomical Journal
JF - Astronomical Journal
IS - 3
ER -