2003AJ....125.2975L

Query : 2003AJ....125.2975L

2003AJ....125.2975L - Astron. J., 125, 2975-2997 (2003/June-0)

Uncovering additional clues to galaxy evolution. II. The environmental impact of the Virgo cluster on the evolution of dwarf irregular galaxies.

LEE H., McCALL M.L. and RICHER M.G.

Abstract (from CDS):

The impact of the cluster environment on the evolution of dwarf galaxies is investigated by comparing the properties of a sample of dwarf irregular galaxies (dI's) in the Virgo Cluster with a control sample of nearby (``field'') dI's having oxygen abundances derived from [O III] λ4363 measurements and measured distances from resolved stellar constituents. Spectroscopic data are obtained for H II regions in 11 Virgo dI's distributed in the central and outer regions of the cluster. To ensure that oxygen abundances are derived in a homogeneous manner, oxygen abundances for field and Virgo dI's are computed using the bright-line method and compared with abundances directly obtained from [O III] λ4363, where available. They are found to agree to within about 0.2 dex, with no systematic offset. At a given optical luminosity, there is no systematic difference in oxygen abundance between the sample of Virgo dI's and the sample of nearby dI's. However, five of the 11 Virgo dI's exhibit much lower baryonic gas fractions than field dI's at comparable oxygen abundances. Using field dI's as a reference, a gas-deficiency index for dI's is constructed, making it possible quantitatively to identify which galaxies have lost gas. For the Virgo sample, some of the dwarfs are gas-deficient by a factor of 30. The gas deficiency correlates roughly with the X-ray surface brightness of the intracluster gas. Ram pressure stripping can best explain the observed gas-poor dI's in the cluster sample. Together with the lack of significant fading and reddening of the gas-poor dI's compared with gas-normal dI's, these observations suggest that the gas-poor dI's in Virgo have recently encountered the intracluster medium for the first time. Faded remnants of gas-poor dI's in Virgo will resemble bright dwarf elliptical galaxies currently seen in the cluster core.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Dwarf - Galaxies: Evolution - Galaxies: Irregular

Nomenclature: Table 4: [LMR2003] NNNN-N N=20.

Simbad objects: 76

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Number of rows : 76
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Wolf-Lundmark-Melotte G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 691 2
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 778 2
3 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1119 1
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
5 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 509 0
6 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1236 2
7 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 100 1
8 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1241 3
9 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 252 0
10 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1090 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
12 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 564 3
13 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 769 0
14 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 769 2
15 NAME Leo A G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 615 0
16 NAME Sextans B H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 528 0
17 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 769 2
18 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 727 2
19 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 665 1
20 UGC 6456 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 335 1
21 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 965 1
22 IC 3105 AG? 12 17 33.750 +12 23 17.15   15.0       ~ 92 0
23 NGC 4261 LIN 12 19 23.2160630 +05 49 29.700024   13.92 12.87     ~ 1223 0
24 UGC 7421 GiC 12 21 55.581 +11 58 00.55   17       ~ 49 0
25 NGC 4325 BiC 12 23 06.662 +10 37 16.45   15.0       ~ 128 1
26 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1763 2
27 MCG+01-32-056 GiG 12 25 52.500 +05 48 36.32   15.2       ~ 76 0
28 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1084 1
29 LEDA 40670 AG? 12 26 18.597 +08 20 59.09   16       ~ 51 0
30 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
31 ACO 1541 ClG 12 27 31.49 +08 50 43.5           ~ 95 0
32 UGC 7596 LSB 12 28 33.928 +08 38 22.61   15.3       ~ 77 0
33 IC 3412 GiG 12 29 22.647 +09 59 20.49   15.4       ~ 64 0
34 IC 3416 LSB 12 29 34.959 +10 47 35.17   15.3       ~ 48 0
35 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2094 2
36 [LKG97b] C2 HII 12 29 56 +07 57.6           ~ 3 0
37 UGC 7636 LSB 12 30 00.350 +07 55 47.44   15.4       ~ 134 0
38 ACO 1553 ClG 12 30 48.000 +10 33 21.60           ~ 82 0
39 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7196 3
40 IC 3475 LSB 12 32 40.985 +12 46 13.94   15.4 13.29   12.37 ~ 107 0
41 ACO 1560 ClG 12 33 58.4 +15 11 30           ~ 22 0
42 NGC 4532 GiP 12 34 19.329 +06 28 03.73   12.3       ~ 287 2
43 IC 3522 GiP 12 34 45.576 +15 13 14.80   17       ~ 99 0
44 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 995 2
45 M 58 Sy2 12 37 43.5 +11 49 06 10.80 10.48 9.66     ~ 1079 2
46 Z 42-192 AG? 12 39 21.880 +04 56 11.94   15.4       ~ 45 0
47 BD+18 2647 HS* 12 41 51.7899961800 +17 31 19.750566756 10.261 11.70 11.63 11.969 12.159 sdOpec 181 1
48 NGC 4639 GiP 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 611 0
49 M 60 GiP 12 43 39.9680 +11 33 09.696   10.3       ~ 1348 1
50 LEDA 43072 LSB 12 46 15.297 +10 12 20.14   16       ~ 72 0
51 UGC 8091 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 463 0
52 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
53 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 350 3
54 UGC 9128 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 283 0
55 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 235 4
56 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
57 [LMR2003] 1554-2 HII ~ ~           ~ 1 0
58 [LMR2003] 0848-1 HII ~ ~           ~ 1 0
59 [LMR2003] 1554-1 HII ~ ~           ~ 1 0
60 [LMR2003] 1249-1 HII ~ ~           ~ 1 0
61 [LMR2003] 1200-2 HII ~ ~           ~ 1 0
62 [LMR2003] 1179-4 HII ~ ~           ~ 1 0
63 [LMR2003] 1179-3 HII ~ ~           ~ 1 0
64 [LMR2003] 1179-2 HII ~ ~           ~ 1 0
65 [LMR2003] 1179-1 HII ~ ~           ~ 1 0
66 [LMR2003] 1114-2 HII ~ ~           ~ 1 0
67 [LMR2003] 1114-1 HII ~ ~           ~ 1 0
68 [LMR2003] 0888-2 HII ~ ~           ~ 1 0
69 [LMR2003] 2037-2 HII ~ ~           ~ 1 0
70 [LMR2003] 0888-1 HII ~ ~           ~ 1 0
71 [LMR2003] 2037-1 HII ~ ~           ~ 1 0
72 [LMR2003] 1789-1 HII ~ ~           ~ 1 0
73 [LMR2003] 1585-1 HII ~ ~           ~ 1 0
74 [LMR2003] 1554-5 HII ~ ~           ~ 1 0
75 [LMR2003] 1554-4 HII ~ ~           ~ 1 0
76 [LMR2003] 1554-3 HII ~ ~           ~ 1 0

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