2007MNRAS.376..820L

Query : 2007MNRAS.376..820L

2007MNRAS.376..820L - Mon. Not. R. Astron. Soc., 376, 820-840 (2007/April-1)

Interstellar medium oxygen abundances of dwarf irregular galaxies in Centaurus A and nearby groups.

LEE H., ZUCKER D.B. and GREBEL E.K.

Abstract (from CDS):

We present results of optical spectroscopy of 35 Hii regions from eight dwarf galaxies in the Centaurus A (Cen A) group. [Oiii] λ4363 is detected in ESO272-G025 and ESO324-G024, and direct oxygen abundances of 12 + log(O/H) = 7.76±0.09 and 7.94±0.11 are derived, respectively. For the remaining galaxies, abundances are derived using common bright-line methods. To compare the influence of group environments on dwarf galaxies, we have also gathered data for additional dwarf irregular galaxies from the Cen A and the Sculptor groups from the literature. We have examined possible relationships between oxygen abundance, gas fraction, effective chemical yield and tidal indices. Despite large positive tidal indices for a number of Cen A dwarfs in the present sample, there is no clear separation between galaxies with positive tidal indices and galaxies with negative tidal indices in the luminosity-metallicity, metallicity-gas fraction and metallicity-tidal index diagrams. The Hi surface mass density decreases with increasing positive tidal index, which is expected in strong tidal encounters. There are no strong trends between oxygen abundances or yields and projected distances of galaxies within their respective groups. We also present spectra for 13 Hii regions in three nearby dwarf irregular galaxies: DDO 47, NGC 3109 and Sextans B. For DDO 47, the [Oiii] λ4363 oxygen abundance (7.92±0.06) for the Hii region SHK91 No. 18 agrees with recently published values. For Sextans B, the [Oiii] λ4363 oxygen abundance (7.80±0.13) for Hii region SHK91 No. 5 agrees with published work in which O+ abundances were determined entirely from [Oii] λλ7320, 7330 fluxes.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: evolution - galaxies: interactions - galaxies: irregular

Nomenclature: Figs 1, 2, Table 13: [LZG2007] AM 1318-444 N (No. 1), [LZG2007] ESO 272-25 N (Nos 1-2), [LZG2007] ESO 274-1 N (Nos 1-8), [LZG2007] ESO 324-24 N (Nos 1-5), [LZG2007] ESO 325-11 N (Nos 1-5), [LZG2007] ESO 381-20 N (Nos 1-6), [LZG2007] IC 4247 N (Nos 1-2), [LZG2007] IC 4316 N (Nos 1-6).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 61

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Number of rows : 61
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12645 1
4 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 509 0
5 LEDA 166061 AG? 01 08 21.93 -38 12 34.5           ~ 30 0
6 LP 995-86 Pe* 03 48 22.6125679056 -39 08 37.013680104   13.61 13.15     F 100 0
7 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 100 1
8 NAME Maffei Group GrG 03 49 +68.0           ~ 49 0
9 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 252 0
10 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 662 1
11 ESO 489-56 AG? 06 26 17.4435 -26 16 01.290   16.69   16.28 15.0 ~ 58 0
12 [HG85] DDO 47 2 HII 07 41 54.2 +16 47 59           ~ 3 0
13 [SHK91] DDO 47 17 HII 07 41 54.7 +16 47 59           ~ 2 0
14 [HG85] DDO 47 1 HII 07 41 55.0 +16 47 58           ~ 4 0
15 UGC 3974 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 225 0
16 NGC 2683 AGN 08 52 41.3064829584 +33 25 18.597681516 11.57 10.68 9.79 9.38   ~ 446 1
17 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1105 1
18 NAME M 81-82 Group GrG 09 55 +69.1           ~ 717 0
19 [SHK91] Sextans B 2 HII 09 59 58.2 +05 19 44           ~ 5 0
20 [H74b] Sextans B 1 HII 09 59 58.2 +05 19 44           ~ 5 0
21 [H74b] Sextans B 2 HII 10 00 00.8 +05 20 30           ~ 5 0
22 NAME Sextans B H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 528 0
23 [H74b] Sextans B 3 HII 10 00 03.1 +05 20 27           ~ 5 0
24 [H69] NGC 3109 12 HII 10 02 56.3 -26 08 58           ~ 4 0
25 [BCP93] F1 H3 HII 10 03 01.3 -26 08 37           ~ 6 0
26 [RM92] HII 6 HII 10 03 03.6 -26 09 19           ~ 8 0
27 [RM92] HII 8 HII 10 03 05.1 -26 09 23           ~ 3 0
28 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 769 2
29 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 212 1
30 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 727 2
31 CD-34 6792 PM* 10 32 13.6185546336 -35 37 41.711776068   12.84 11.84     F:wl: 149 0
32 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 280 0
33 HD 105183 HS* 12 06 47.2348389600 +11 40 12.659833056   10.93 11.06     sdB8IIIHe2 120 0
34 ESO 321-14 AG? 12 13 48.8792 -38 14 00.250 16.32 15.70 15.35 15.20 15.2 ~ 88 0
35 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6643 0
36 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1125 1
37 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 142 0
38 ESO 381-18 EmG 12 44 42.39 -35 58 00.2   15.79   14.84 15.1 ~ 56 0
39 ESO 381-20 AG? 12 46 00.67 -33 50 13.0   14.24   13.50 14.0 ~ 88 0
40 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 592 1
41 UGCA 320 GiP 13 03 16.736 -17 25 22.91 13.98 13.42 13.09 12.96 13.3 ~ 122 0
42 UGC 8308 AG? 13 13 22.839 +46 19 21.71   17       ~ 131 1
43 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
44 LEDA 46663 AG? 13 21 47.40 -45 03 42.0           ~ 60 0
45 LEDA 46885 GiC 13 24 36.23 -30 58 18.5   16.67   17.33   ~ 57 1
46 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4484 3
47 IC 4247 EmG 13 26 44.43 -30 21 44.7 15.34 14.67 14.28 14.13 14.53 ~ 89 0
48 ESO 324-24 LSB 13 27 37.6117 -41 28 44.128   12.91   12.13 12.3 ~ 100 0
49 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2572 2
50 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 64 0
51 ESO 444-84 GiC 13 37 19.99 -28 02 42.0 16.04 15.34 15.05 15.05 14.9 ~ 121 1
52 IC 4316 EmG 13 40 18.41 -28 53 32.0   15.02 15.93 14.15   ~ 83 0
53 NGC 5264 GiG 13 41 36.683 -29 54 47.25 13.86 12.96 12.39 12.14 15.83 ~ 152 1
54 ESO 325-11 AG? 13 45 01.0528 -41 51 45.993   14.02   13.49 12.9 ~ 106 0
55 NAME TR 1346-35 EmG 13 49 17.5109711256 -36 03 48.860478360   11.00   10.11   ~ 111 1
56 CD-32 9927 * 14 11 46.3227735768 -33 03 14.373268704   10.793 10.444 10.12 10.106 A4 98 0
57 ESO 272-25 AG? 14 43 25.52 -44 42 18.9   14.79   14.00 13.8 ~ 39 0
58 ESO 274-1 G 15 14 13.429 -46 48 33.12   12.00   10.97 11.3 ~ 107 0
59 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0
60 ESO 348-9 AG? 23 49 23.4984 -37 46 25.536   14.6   14.7 14.4 ~ 58 0
61 NAME Local Group GrG ~ ~           ~ 8389 0

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