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).
Cortese, L., Gavazzi, G., Boselli, A., Iglesias Paramo, J. (2004). An extragalactic HII region in the Virgo cluster. ASTRONOMY & ASTROPHYSICS, 416(1), 119-123 [10.1051/0004-6361:20031755].
An extragalactic HII region in the Virgo cluster
GAVAZZI, GIUSEPPE;
2004
Abstract
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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