An extragalactic HII region in the Virgo cluster

被引：37

作者：

Cortese, L

Gavazzi, G

Boselli, A

Iglesias-Paramo, J

机构：

[1] Univ Studi Milano Bicocca, I-20126 Milan, Italy

[2] Lab Astrophys Marseille, F-13376 Marseille, France

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 416卷 / 01期

关键词：

galaxies : distances and redshifts; galaxies : clusters : individuals : Virgo; galaxies : abundances; ISM : HII regions;

D O I：

10.1051/0004-6361:20031755

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present spectroscopic observations for six emission-line objects projected onto the Virgo cluster. These sources have been selected from narrow band (Halpha + [NII]) images showing faint detectable continuum emission and EW > 100 Angstrom. Five of these sources result [O III]lambda5007 emitters at z similar to 0.31, while one 122603+130724 is confirmed to be an HII region belonging to the Virgo cluster. This point-like source has a recessional velocity of similar to200 km s(-1), and is associated with the giant galaxy VCC 873 (NGC 4402). It has a higher luminosity, star formation rate and metallicity than the extragalactic HII region recently discovered near the Virgo galaxy VCC 836 by Gerhard et al. (2002).

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页码：119 / 123

页数：5

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