An extragalactic HII region in the Virgo cluster

Free access article

Issue		A&A Volume 416, Number 1, March II 2004


Page(s)		119 - 123
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20031755

A&A 416, 119-123 (2004)
DOI: 10.1051/0004-6361:20031755

An extragalactic HII region in the Virgo cluster

L. Cortese¹, G. Gavazzi¹, A. Boselli² and J. Iglesias-Paramo²

¹ Universitá degli Studi di Milano-Bicocca, P.zza della Scienza 3, 20126 Milano, Italy
e-mail: Giuseppe.Gavazzi@mib.infn.it
² Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille, France
e-mail: jorge.iglesias;alessandro.boselli@oamp.fr

(Received 21 July 2003 / Accepted 2 December 2003)

Abstract
We present spectroscopic observations for six emission-line objects projected onto the Virgo cluster. These sources have been selected from narrow band ( $\rm H\alpha+[NII]$ ) images showing faint detectable continuum emission and $EW > 100~\rm\AA$ . Five of these sources result $\rm [OIII] \lambda 5007$ emitters at $z \sim 0.31$ , 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 ~ $\rm 200~km~s^{-1}$ , 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).

Key words: galaxies: distances and redshifts -- galaxies: clusters: individuals: Virgo -- galaxies: abundances -- ISM: HII regions

Offprint request: L. Cortese, Luca.Cortese@mib.infn.it

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