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

被引：33

作者：

Hallenbeck, Gregory ^{[1
]}

Papastergis, Emmanouil ^{[1
]}

Huang, Shan ^{[1
]}

Haynes, Martha P. ^{[1
]}

Giovanelli, Riccardo ^{[1
]}

Boselli, Alessandro ^{[2
,3
]}

Boissier, Samuel ^{[2
,3
]}

Heinis, Sebastien ^{[2
,3
]}

Cortese, Luca ^{[4
]}

Fabello, Silvia ^{[5
]}

机构：

[1] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA

[2] Univ Aix Marseille, LAM, F-13388 Marseille 13, France

[3] CNRS, UMR7326, F-13388 Marseille 13, France

[4] European So Observ, D-85748 Garching, Germany

[5] Max Planck Inst Astrophys, D-85741 Garching, Germany

来源：

ASTRONOMICAL JOURNAL | 2012年 / 144卷 / 03期

基金：

美国国家科学基金会;

关键词：

galaxies: clusters: individual (Virgo); galaxies: elliptical and lenticular; cD; galaxies: evolution; radio lines: galaxies; FAST-ALPHA SURVEY; DIGITAL SKY SURVEY; HI SOURCE CATALOG; STAR-FORMATION; ELLIPTIC GALAXIES; NEUTRAL-HYDROGEN; CLUSTER GALAXIES; IRREGULAR GALAXIES; SCALING RELATIONS; FORNAX CLUSTER;

D O I：

10.1088/0004-6256/144/3/87

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 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.

引用

页数：13

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