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Star-forming regions in the intragroup medium of compact groups of galaxies

Published online by Cambridge University Press:  13 April 2010

S. Torres-Flores ,
C. Mendes de Oliveira ,
D. F. de Mello ,
P. Amram ,
H. Plana ,
B. Epinat  and
J. Iglesias-Páramo
S. Torres-Flores
Affiliation:
Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Astronomia, São Paulo, Brazil email: storres@astro.iag.usp.br Laboratoire d'Astrophysique de Marseille, OAMP, Université de Provence & CNRS, 38 rue F. Joliot–Curie, 13388 Marseille, Cedex 13, France
C. Mendes de Oliveira
Affiliation:
Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Departamento de Astronomia, São Paulo, Brazil email: storres@astro.iag.usp.br
D. F. de Mello
Affiliation:
Observational Cosmology Laboratory, Code 665, Goddard Space Flight Center, Greenbelt, MD 20771, USA Catholic University of America, Washington, DC 20064, USA
P. Amram
Affiliation:
Laboratoire d'Astrophysique de Marseille, OAMP, Université de Provence & CNRS, 38 rue F. Joliot–Curie, 13388 Marseille, Cedex 13, France
H. Plana
Affiliation:
Laboratoire d'Astrophysique de Marseille, OAMP, Université de Provence & CNRS, 38 rue F. Joliot–Curie, 13388 Marseille, Cedex 13, France Laboratorio de Astrofisica Teorica e Observacional, Universidade Estadual de Santa Cruz, Brazil
B. Epinat
Affiliation:
Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France
J. Iglesias-Páramo
Affiliation:
Instituto de Astrofisica de Andalucia (CSIC), Camino Bajo de Huetor 50, 18008 Granada, Spain
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Abstract

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We present the results of a multiwavelength campaign searching for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92. We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images, optical R-band and HI maps to evaluate the stage of interaction of each group. We conclude that groups (i) HCG 7 and HCG 23 are in an early stage of interaction, (ii) HCG 2 and HCG 22 are mildly interacting, and (iii) HCG 92, HCG 100 and NGC 92 are in a late stage of evolution. Evolved groups have a population of young objects in their intragroup medium while no such population is found within the less evolved groups. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies which have peculiar velocity fields, also show extended HI tails. Our results indicate that the advanced stage of evolution of a group together with the presence of intragroup HI clouds may lead to star formation in the intragroup medium.

Keywords

galaxies: interactions(galaxies:) intergalactic mediumgalaxies: kinematics and dynamics
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 440 - 441
Copyright
Copyright © International Astronomical Union 2010

References

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Torres-Flores, S., Mendes de Oliveira, C., de Mello, D. F., Amram, P., Plana, H., Epinat, B., & Iglesias-Páramo, J. 2009, accepted to publication in A&A (arXiv0908.2798)Google Scholar
Torres-Flores, S., Mendes de Oliveira, C., de Mello, D. F. et al. submitted to A&AGoogle Scholar