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Intergalactic HII regions in Stephan's Quintet

Published online by Cambridge University Press:  06 October 2004

C. Mendes de Oliveira ,
E. S. Cypriano ,
L. Sodré  and
C. Balkowski
C. Mendes de Oliveira
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Astronomia, Universidade de São Paulo, Brazil email: [email protected] Present address: Universitäts-Sternwarte der Ludwig-Maximilians-Universität, Scheinerstrasse 1, D-81679 München, Germany
E. S. Cypriano
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Astronomia, Universidade de São Paulo, Brazil email: [email protected]
L. Sodré
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Astronomia, Universidade de São Paulo, Brazil email: [email protected]
C. Balkowski
Affiliation:
Observatoire de Paris, GEPI, CNRS and Universite Paris 7, 5 Place Jules Janssen, F-92195 Meudon Cedex, France
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Abstract

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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 ${\rm M}_B$ ranging from −11.9 to −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$\pm$0.25, which suggests that they were formed from pre-enriched material. We derive a mean age of $4.6 \pm 0.6$ Myr and a mean stellar mass of $(2.9 \pm 1.4)\times10^4~M_\odot$ 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.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 450 - 452
Copyright
© 2004 International Astronomical Union