GAS-BEARING EARLY-TYPE DWARF GALAXIES IN VIRGO: EVIDENCE FOR RECENT ACCRETION - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astronomical Journal Année : 2012

GAS-BEARING EARLY-TYPE DWARF GALAXIES IN VIRGO: EVIDENCE FOR RECENT ACCRETION

Résumé

We investigate the dwarf (M-B \textgreater -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 Hi 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 Hi 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.

Dates et versions

hal-01442197 , version 1 (20-01-2017)

Identifiants

Citer

Gregory Hallenbeck, Emmanouil Papastergis, Shan Huang, Martha P. Haynes, Riccardo Giovanelli, et al.. GAS-BEARING EARLY-TYPE DWARF GALAXIES IN VIRGO: EVIDENCE FOR RECENT ACCRETION. The Astronomical Journal, 2012, 144 (3), ⟨10.1088/0004-6256/144/3/87⟩. ⟨hal-01442197⟩
50 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More