An investigation of the luminosity-metallicity relation for a largesample of low-metallicity emission-line galaxies

N. G. Guseva; P. Papaderos; H. T. MeyerY. I.IzotovK. J. Fricke

首页> 外文期刊>Astronomy and astrophysics >An investigation of the luminosity-metallicity relation for a largesample of low-metallicity emission-line galaxies

【24h】

An investigation of the luminosity-metallicity relation for a largesample of low-metallicity emission-line galaxies

机译：An investigation of the luminosity-metallicity relation for a largesample of low-metallicity emission-line galaxies

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

Context. We present 8.2 m VLT spectroscopic observations of 28 H II regions in 16 emission-line galaxies and 3.6 m ESO telescopespectroscopic observations of 38 H II regions in 28 emission-line galaxies. These emission-line galaxies were selected mainly fromthe data release 6 (DR6) of the Sloan digital sky survey (SDSS) as metal-deficient galaxy candidates.Aims. We collect photometric and high-quality spectroscopic data for a large uniform sample of star forming galaxies including newobservations. Our aim is to study the luminosity-metallicity (L – Z) relation for nearby galaxies, especially at its low-metallicity endand compare it with that for higher-redshift galaxies.Methods. Physical conditions and element abundances in the new sample are derived with the Te-method, excluding six H II regionsfrom the VLT observations and nearly two third of the H II regions from the 3.6 m observations. Element abundances for the lattergalaxies were derived with the semiempirical strong-line method.Results. From our new observations we find that the oxygen abundance in 61 out of the 66 H II regions of our sample ranges from12 + log O/H = 7.05 to 8.22. Our sample includes 27 new galaxies with 12 + log O/H < 7.6 which qualify as extremely metal-poorstar-forming galaxies (XBCDs). Among them are 10 H II regions with 12 + log O/H < 7.3. The new sample is combined with a further93 low-metallicity galaxies with accurate oxygen abundance determinations from our previous studies, yielding in total a high-qualityspectroscopic data set of 154 H II regions. 9000 more galaxies with oxygen abundances, based mainly on the Te-method, are compiledfrom the SDSS. Photometric data for all galaxies of our combined sample are taken from the SDSS database while distances are fromthe NED. Our data set spans a range of 8 mag with respect to its absolute magnitude in SDSS g (-12 ≥ –20) and nearly 2 dexin its oxygen abundance (7.0 ≤ 12 + log O/H ≤ 8.8), allowing us to probe the L – Z relation in the nearby universe down to the lowestcurrently studied metallicity level. The L – Z relation established on the basis of the present sample is consistent with previous onesobtained for emission-line galaxies.

著录项

来源
《Astronomy and astrophysics》 |2009年第1期|63-72|共10页
作者
N. G. Guseva; P. Papaderos; H. T. MeyerY. I.IzotovK. J. Fricke;
展开▼
作者单位

Max-Planck-Institute for Radioastronomy, Auf dem Hugel 69, 53121 Bonn, Germany;

Instituto de Astrofisica de Andalucia(CSIC),Camino Bajo de Huetor 50, Granada 18008, Spain;

Astronomisches Rechen-Institut am Zentrum fur Astronomie (ZAH), Monchhofstr. 12-14, 69120 Heidelberg, Germany;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类天文学;
关键词
galaxies; abundances – galaxies; starburst – galaxies; ISM – galaxies; fundamental parameters;

An investigation of the luminosity-metallicity relation for a largesample of low-metallicity emission-line galaxies

摘要

著录项

相关主题

期刊订阅