2015A&A...579A..11G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:04:58

2015A&A...579A..11G - Astronomy and Astrophysics, volume 579A, 11-11 (2015/7-1)

New candidates for extremely metal-poor emission-line galaxies in the SDSS/BOSS DR10.

GUSEVA N.G., IZOTOV Y.I., FRICKE K.J. and HENKEL C.

Abstract (from CDS):

We present a spectroscopic study of eight extremely low-metallicity candidate emission-line galaxies with oxygen abundances possibly below 12+logO/H=7.35. These galaxies were selected from data release 10 of the Sloan Digital Sky Survey/Baryon Oscillation Spectroscopic Survey (SDSS/BOSS DR10). We will call these extremely metal-deficient (XMD) galaxies. The electron temperature-sensitive emission line [OIII]λ4363 is detected in three galaxies and marginally detected in two galaxies, allowing for abundance determination by a ``direct'' method. Because of large uncertainties in the [OIII]λ4363Å line fluxes, we also calculated oxygen abundance in these galaxies together with the remaining three galaxies using a strong-line semi-empirical method. This method gives oxygen abundances higher than 7.35 for three galaxies with detected [OIII]λ4363Å line and lower than 7.35 for the remaining five objects of the sample. The newly-discovered galaxies represent excellent targets for follow-up spectroscopic observations with the largest telescopes to improve the oxygen abundance determination and to increase the number of these very rare low-metallicity objects. The extreme location of the most massive and luminous XMD galaxies and XMD candidates in the stellar mass-metallicity diagram implies that these galaxies may be genuine young objects. With stellar masses of up to ∼107-108M, the galaxies are not chemically enriched and strongly deviate to lower metallicity as compared to the relation obtained for a large sample of low-redshift, star-forming galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: irregular - galaxies: evolution - galaxies: formation - galaxies: ISM - ISM: abundances

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SDSS J010056.92-002843.8 G 01 00 56.929 -00 28 43.88           ~ 2 0
2 SDSS J012241.60+004842.0 G 01 22 41.606 +00 48 42.00           ~ 2 0
3 UGCA 20 bCG 01 43 14.6 +19 58 51   16       ~ 49 0
4 SDSS J014315.15+195806.0 G 01 43 15.15240 +19 58 06.0924           ~ 2 0
5 SDSS J015311.96+010440.1 G 01 53 11.959 +01 04 40.13           ~ 2 0
6 SDSS J022238.53-093535.3 G 02 22 38.531 -09 35 35.29           ~ 1 0
7 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 98 1
8 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 149 1
9 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 433 1
10 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 997 1
11 SDSS J094519.54+383552.9 G 09 45 19.554 +38 35 52.88           ~ 2 0
12 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 152 0
13 SDSS J103639.46+203615.8 G 10 36 39.465 +20 36 15.80           ~ 2 0
14 SDSS J122845.54-012526.8 G 12 28 45.543 -01 25 26.86           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:04:58

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