Intergalactic HII regions in Stephan's Quintet

Details Intergalactic HII regions in Stephan's Quintet Intergalactic HII regions in Stephan's Quintet

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ogci.conf..450m&link_type=abstract

Outskirts of Galaxy Clusters: Intense Life in the Suburbs. Edited by Antonaldo Diaferio, IAU Colloquium #195, p.450-452

Computer Science

Scientific paper

We have discovered four intergalactic HII regions in the Stephan's quintet, at more than 25 kpc projected distance from the center of the nearest group galaxy, with no apparent optical connection to it. They have MB ranging from [minus sign]11.9 to [minus sign]12.5 mag, colors B-R=0.7 to 1.1 mag, radial velocities from 6565 to 6651 km/s and they are superposed onto the HI tail east of NGC 7319, with a mean radial velocity of 6610 km/s. In addition, they have metalicities of the order of 12+log(O/H)=8.58±0.25, which suggests that they were formed from pre-enriched material. We derive a mean age of 4.6 ± 0.6 Myr and a mean stellar mass of (2.9 ± 1.4)×104 M&sun; for the four objects. The masses, ages, colors, velocities, metalicities and location of the objects suggest that they are HII regions that were formed far away from the galaxies through compression of the intergalactic HI gas by galaxy collisions.

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