An extragalactic HII region in the Virgo cluster
arXiv:astro-ph/0312061 · doi:10.1051/0004-6361:20031755
Abstract
We present spectroscopic observations for six emission-line objects projected onto the Virgo cluster. These sources have been selected from narrow band (Hα+[NII]) images showing faint detectable continuum emission and EW>100 Angstrom. Five of these sources result [OIII]λ5007 emitters at z ~ 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 ~ 200 km/s, and is associated with the giant galaxy VCC873 (NGC 4402). It has a higher luminosity, star formation rate and metallicity than the extragalactic HII region recently discovered near the Virgo galaxy VCC836 by Gerhard et al. (2002).
7 pages, 2 figures, 4 tables. Accepted for publication on A&A. High resolution figures and FITS images available at http://goldmine.mib.infn.it/papers/vcc873.html
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