2009A&A...505...63G

Query : 2009A&A...505...63G

2009A&A...505...63G - Astronomy and Astrophysics, volume 50563-72 (2009/10-1)

An investigation of the luminosity-metallicity relation for a large sample of low-metallicity emission-line galaxies.

GUSEVA N.G., PAPADEROS P., MEYER H.T., IZOTOV Y.I. and FRICKE K.J.

Abstract (from CDS):

We present 8.2m VLT spectroscopic observations of 28 HII regions in 16 emission-line galaxies and 3.6m ESO telescope spectroscopic observations of 38 HII regions in 28 emission-line galaxies. These emission-line galaxies were selected mainly from the data release 6 (DR6) of the Sloan digital sky survey (SDSS) as metal-deficient galaxy candidates. We collect photometric and high-quality spectroscopic data for a large uniform sample of star forming galaxies including new observations. Our aim is to study the luminosity-metallicity (L-Z) relation for nearby galaxies, especially at its low-metallicity end and compare it with that for higher-redshift galaxies. Physical conditions and element abundances in the new sample are derived with the Te-method, excluding six HII regions from the VLT observations and nearly two third of the HII regions from the 3.6m observations. Element abundances for the latter galaxies were derived with the semiempirical strong-line method. From our new observations we find that the oxygen abundance in 61 out of the 66 HII regions of our sample ranges from 12+logO/H=7.05 to 8.22. Our sample includes 27 new galaxies with 12+logO/H<7.6 which qualify as extremely metal-poor star-forming galaxies (XBCDs). Among them are 10 HII regions with 12+logO/H<7.3. The new sample is combined with a further 93 low-metallicity galaxies with accurate oxygen abundance determinations from our previous studies, yielding in total a high-quality spectroscopic data set of 154 HII regions. 9000 more galaxies with oxygen abundances, based mainly on the Te-method, are compiled from the SDSS. Photometric data for all galaxies of our combined sample are taken from the SDSS database while distances are from the NED. Our data set spans a range of 8mag with respect to its absolute magnitude in SDSS g (-12>Mg>-20) and nearly 2dex in its oxygen abundance (7.0≲12+logO/H≲8.8), allowing us to probe the L-Z relation in the nearby universe down to the lowest currently studied metallicity level. The L-Z relation established on the basis of the present sample is consistent with previous ones obtained for emission-line galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: starburst - galaxies: ISM - galaxies: fundamental parameters

Nomenclature: Tables 1, 2: [GPM2009] JHHMM+DDMM N, [GPM2009] JHHMM+DDMM BGN, [GPM2009] NNNNNN, [GPM2009] GHHMMSSs+DDMMSS N, [GPM2009] GHHMMSSs+DDMMSS {BG}, [GPM2009] HHMM+DDMM, [GPM2009] PHL293B N=38+28.

Simbad objects: 67

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Number of rows : 67
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 SDSS J000421.60+002536.2 EmG 00 04 21.60156 +00 25 36.1870           ~ 5 0
2 [GPM2009] J0004+0025 2 EmG 00 04 21.61 +00 25 35.4           ~ 2 0
3 [GPM2009] J0014-0044 2 EmG 00 14 28.8 -00 44 44           ~ 1 0
4 [GPM2009] J0014-0044 1 EmG 00 14 28.8 -00 44 44           ~ 5 0
5 AGC 103435 LSB 00 15 20.679 +01 04 36.99           ~ 19 0
6 SDSS J001628.25+010801.9 G 00 16 28.25452 +01 08 02.0130           ~ 5 0
7 SDSS J002904.70-010825.9 AG? 00 29 04.706 -01 08 25.96   19.315   18.865   ~ 6 0
8 SDSS J002949.49-002539.8 G 00 29 49.45346 -00 25 40.5491           ~ 5 0
9 SDSS J005712.60-002157.6 EmG 00 57 12.603 -00 21 57.67           ~ 6 0
10 SDSS J010750.81+000128.3 G 01 07 50.817 +00 01 28.42           ~ 4 0
11 LEDA 1185205 H2G 01 09 07.938 +01 07 15.70           ~ 17 0
12 SDSS J012646.11-003838.8 G 01 26 46.119 -00 38 38.86           ~ 3 0
13 [GPM2009] J0126-0038 2 EmG 01 26 46.4 -00 38 39           ~ 3 0
14 SDSS J013544.03-002316.8 AG? 01 35 44.041 -00 23 16.67           ~ 7 0
15 SDSS J020237.97-004743.8 G 02 02 37.97548 -00 47 43.9407           ~ 5 0
16 [GPM2009] J0213-0002 2 EmG 02 13 57.7 -00 02 56           ~ 1 0
17 [GPM2009] J0213-0002 1 G 02 13 57.718 -00 02 55.74           ~ 1 0
18 [GPM2009] J0216+0115 1 EmG 02 16 29.3 -01 15 21           ~ 1 0
19 [GPM2009] J0216+0115 2 EmG 02 16 29.3 -01 15 21           ~ 1 0
20 [GPM2009] 096632 EmG 02 51 47.5 -30 06 32           ~ 3 0
21 LEDA 1162139 AG? 02 52 16.769 +00 17 41.19           ~ 10 0
22 LEDA 1170514 AG? 02 56 28.330 +00 36 27.83           ~ 10 0
23 [GPM2009] J0301-0059 2 EmG 03 01 26.3 -00 59 26           ~ 2 0
24 [GPM2009] J0301-0059 1 EmG 03 01 26.3 -00 59 26           ~ 4 0
25 [GPM2009] J0301-0059 3 EmG 03 01 26.3 -00 59 26           ~ 1 0
26 [GPM2009] J0303-0109 2 HII 03 03 31.3 -01 09 47           ~ 1 0
27 [GPM2009] J0303-0109 1 HII 03 03 31.3 -01 09 47           ~ 1 0
28 [GPM2009] J0315-0024 2 EmG 03 15 59.9 -00 24 26           ~ 1 0
29 SDSS J031559.89-002425.7 EmG 03 15 59.9 -00 24 26           ~ 4 0
30 [GPM2009] J0338+0013 EmG 03 38 12.2 +00 13 13           ~ 4 0
31 [GPM2009] J0338+0013 BG EmG 03 38 12.2 +00 13 13           ~ 1 0
32 [GPM2009] J0341-0026 1 EmG 03 41 18.1 -00 26 28           ~ 2 0
33 [GPM2009] J0341-0026 2 EmG 03 41 18.1 -00 26 28           ~ 1 0
34 [GPM2009] J0341-0026 3 EmG 03 41 18.1 -00 26 28           ~ 1 0
35 [GPM2009] G0405204-364859 BG EmG 04 05 18.6 -36 48 49           ~ 3 0
36 [GPM2009] G0405204-364859 3 EmG 04 05 18.6 -36 48 49           ~ 2 0
37 [GPM2009] G0405204-364859 1 EmG 04 05 18.6 -36 48 49           ~ 3 0
38 [GPM2009] G0405204-364859 2 EmG 04 05 18.6 -36 48 49           ~ 2 0
39 [GPM2009] J0519+0007 G 05 19 02.6953532514 +00 07 29.106797166           ~ 23 0
40 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
41 [GPM2009] G1815456-670126 EmG 18 15 46.5 -67 01 23           ~ 1 0
42 [GPM2009] G2052078-691229 1 EmG 20 52 07.1 -69 12 30           ~ 1 0
43 [GPM2009] G2052078-691229 2 EmG 20 52 07.1 -69 12 30           ~ 1 0
44 SDSS J205312.59+003914.2 G 20 53 12.597 +00 39 14.25           ~ 6 0
45 [GPM2009] J2104-0035 2 EmG 21 04 55.3 -00 35 22           ~ 1 0
46 [GPM2009] J2104-0035 4 EmG 21 04 55.3 -00 35 22           ~ 2 0
47 [GPM2009] J2104-0035 1 EmG 21 04 55.3 -00 35 22           ~ 2 0
48 [GPM2009] J2104-0035 3 EmG 21 04 55.30 -00 35 22.0           ~ 3 0
49 [GPM2009] J2105+0032 2 EmG 21 05 08.58 +00 32 23.4           ~ 2 0
50 [GPM2009] J2105+0032 1 EmG 21 05 08.6 +00 32 23           ~ 2 0
51 SDSS J211200.38-001646.4 EmG 21 12 00.40 -00 16 46.4           ~ 6 0
52 [GPM2009] J2112-0016 2 EmG 21 12 00.8 -00 16 49           ~ 2 0
53 SDSS J211942.38-073224.3 G 21 19 42.38202 -07 32 24.4148           ~ 4 0
54 SDSS J212025.93-005826.5 AG? 21 20 25.94029 -00 58 26.3655           ~ 8 0
55 SDSS J215031.95+003305.1 G 21 50 31.957 +00 33 05.07           ~ 5 0
56 [GPM2009] G2155572-394614 EmG 21 55 57.9 -39 46 14           ~ 1 0
57 LEDA 988084 EmG 22 27 30.70008 -09 39 53.9892   16.26   15.78   ~ 15 0
58 NAME Kinman Dwarf bCG 22 30 36.7959714600 -00 06 36.924915456 16.85 17.35 16.87   16.65 ~ 67 2
59 [GPM2009] J2302+0049 1 HII 23 02 10.0 +00 49 39           ~ 2 0
60 [GPM2009] J2302+0049 2 HII 23 02 10.0 +00 49 39           ~ 2 0
61 [GPM2009] J2310-0109 1 EmG 23 10 42.0 -01 09 48           ~ 1 0
62 [GPM2009] J2310-0109 2 EmG 23 10 42.0 -01 09 48           ~ 1 0
63 [GPM2009] J2324-0006 H2G 23 24 21.3069516984 -00 06 29.261169180           ~ 4 0
64 [GPM2009] J2354-0005 BG1 EmG 23 54 37.3 -00 05 02           ~ 1 0
65 [GPM2009] J2354-0005 2 EmG 23 54 37.3 -00 05 02           ~ 1 0
66 [GPM2009] J2354-0005 BG2 EmG 23 54 37.3 -00 05 02           ~ 1 0
67 AGC 630890 EmG 23 54 37.314 -00 05 01.60           ~ 7 0

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