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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 H I tails: HCG 92, HCG 100 and six interacting systems

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Author(s):
de Mello, D. F. [1, 2] ; Urrutia-Viscarra, F. [3] ; Mendes de Oliveira, C. [3] ; Torres-Flores, S. [4] ; Carrasco, E. R. [5] ; Cypriano, E. [3]
Total Authors: 6
Affiliation:
[1] Catholic Univ Amer, Dept Phys, Washington, DC 20064 - USA
[2] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 - USA
[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508090 Sao Paulo - Brazil
[4] Univ La Serena, Dept Fis, La Serena - Chile
[5] So Operat Ctr, Gemini Observ AURA, La Serena - Chile
Total Affiliations: 5
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 426, n. 3, p. 2441-2451, NOV 2012.
Web of Science Citations: 13
Abstract

We present new Gemini spectra of 14 new objects found within the H?i tails of Hickson Compact Groups (HCGs) 92 and 100. Nine of them are Galaxy Evolution Explorer (GALEX) far-ultraviolet (FUV) and near-ultraviolet (NUV) sources. The spectra confirm that these objects are members of the compact groups and have metallicities close to solar, with an average value of 12+log(O/H) similar to 8.5. They have average FUV luminosities 7 x 10(40)?erg?s-1 and very young ages (<100?Myr), and two of them resemble tidal dwarf galaxy (TDG) candidates. We suggest that they were created within gas clouds that were ejected during galaxygalaxy interactions into the intergalactic medium, which would explain the high metallicities of the objects, inherited from the parent galaxies from which the gas originated. We conduct a search for similar objects in six interacting systems with extended H?i tails: NGC 2623, NGC 3079, NGC 3359, NGC 3627, NGC 3718 and NGC 4656. We found 35 ultraviolet (UV) sources with ages < 100?Myr; however, most of them are on average less luminous/massive than the UV sources found around HCG 92 and HCG 100. We speculate that this might be an environmental effect and that compact groups of galaxies are more favourable to TDG formation than other interacting systems. (AU)

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 Opportunities: Research Projects - Thematic Grants
FAPESP's process: 07/07973-3 - The internal kinematics of galaxies in Hickson compact groups
Grantee:Sergio Patricio Torres Flores
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 07/06436-4 - Mapping of extragalactic star forming regions in interacting systems
Grantee:Paula Maria Fernanda Urrutia Viscarra
Support Opportunities: Scholarships in Brazil - Master