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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Star formation in the intragroup medium and other diagnostics of the evolutionary stages of compact groups of galaxies

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Torres-Flores, S. [1, 2, 3] ; de Oliveira, C. Mendes [1] ; de Mello, D. F. [4, 5, 6] ; Amram, P. [2, 3] ; Plana, H. [2, 3, 7] ; Epinat, B. [8] ; Iglesias-Paramo, J. [9]
Total Authors: 7
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Sao Paulo - Brazil
[2] Univ Aix Marseille 1, OAMP, Astrophys Lab, F-13388 Marseille 13 - France
[3] CNRS, F-13388 Marseille - France
[4] Johns Hopkins Univ, Baltimore, MD 21218 - USA
[5] Catholic Univ Amer, Washington, DC 20064 - USA
[6] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 - USA
[7] Univ Estadual Santa Cruz, Lab Astrofis Teor & Observac, Santa Cruz - Brazil
[8] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse - France
[9] CSIC, Inst Astrofis Andalucia, E-18008 Granada - Spain
Total Affiliations: 9
Document type: Journal article
Source: Astronomy & Astrophysics; v. 507, n. 2, p. 723-746, NOV 2009.
Web of Science Citations: 26

Context. Compact groups of galaxies are entities that have high densities of galaxies and serve as laboratories to study galaxy interactions, intergalactic star formation and galaxy evolution. Aims. The main goal of this study is to search for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92 as well as to evaluate the stage of interaction of each group. Methods. We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images and optical R-band and HI maps. Results. (i) HCG 7 and HCG 23 are in early stages of interaction; (ii) HCG 2 and HCG 22 are mildly interacting; and (iii) HCG 92, HCG 100 and NGC 92 are in late stages of evolution. We find that all three evolved groups contain populations of young blue objects in the intragroup medium, consistent with ages < 100 Myr, of which several are younger than < 10 Myr. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies that have peculiar velocity fields, also show extended HI tails. Conclusions. 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. A table containing all intergalactic HII regions and tidal dwarf galaxies confirmed to date is appended. (AU)

FAPESP's process: 07/07973-3 - The internal kinematics of galaxies in Hickson compact groups
Grantee:Sergio Patricio Torres Flores
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 06/56213-9 - New physics from space: formation and evolution of structures in the universe
Grantee:Claudia Lucia Mendes de Oliveira
Support type: Research Projects - Thematic Grants