2012AJ....144...87H

Query : 2012AJ....144...87H

2012AJ....144...87H - Astron. J., 144, 87 (2012/September-0)

Gas-bearing early-type dwarf galaxies in Virgo: evidence for recent accretion.

HALLENBECK G., PAPASTERGIS E., HUANG S., HAYNES M.P., GIOVANELLI R., BOSELLI A., BOISSIER S., HEINIS S., CORTESE L. and FABELLO S.

Abstract (from CDS):

We investigate the dwarf (MB> -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.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Virgo - galaxies: elliptical and lenticular, cD - galaxies: evolution - radio lines: galaxies

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME North Polar Spur ISM 12 00 +00.0           ~ 405 1
2 IC 3052 LSB 12 13 48.271 +12 41 25.95   16.3       ~ 31 0
3 LEDA 39309 LSB 12 16 23.508 +07 47 51.26   20       ~ 23 0
4 IC 3120 AG? 12 18 15.234 +13 44 57.00   15.3       ~ 50 0
5 LEDA 39566 LSB 12 18 43.959 +12 23 08.97   16.3       ~ 31 0
6 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 1004 2
7 LEDA 39760 AG? 12 20 03.990 +05 24 52.69           ~ 26 0
8 LEDA 39825 AG? 12 20 30.712 +13 31 09.11   17.0       ~ 33 0
9 LEDA 40177 AG? 12 23 04.848 +08 19 59.63   16       ~ 28 0
10 NGC 4356 GiG 12 24 14.535 +08 32 08.89   14.3       ~ 155 0
11 LEDA 40769 LSB 12 26 56.434 +12 57 41.45   18.8 18.65   16.49 ~ 31 0
12 LEDA 41091 LSB 12 28 55.498 +08 49 00.68   19.0       ~ 27 0
13 LEDA 4328947 AG? 12 29 33.647 +13 11 45.66   20.0 17.98   17.19 ~ 23 0
14 LEDA 41182 G 12 29 35.572 +13 12 39.60     20.49   19.72 ~ 16 0
15 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2174 2
16 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
17 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
18 LEDA 41502 BiC 12 31 53.833 +05 10 22.32   18.0       ~ 17 0
19 LEDA 41770 LSB 12 34 01.475 +05 57 11.58   18.0       ~ 22 0
20 LEDA 42008 AG? 12 36 02.866 +07 12 01.40   15.7       ~ 30 0
21 Z 71-21 AG? 12 44 11.982 +12 56 30.64   15.3       ~ 73 0
22 LEDA 43211 LSB 12 47 59.92392 +10 58 14.8966   21       ~ 83 0

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