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Star Formation in Hi Tails: HCG 92, HCG 100 and 6 Interacting SystemsWe present new Gemini spectra of 14 new objects found within the HI tails of Hickson Compact Groups 92 and 100. Nine of them are GALEX Far-UV (FUV) and Near-UV (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)approx.8.5. They have average FUV luminosities 7 x 10(exp 40) erg/s, very young ages (< 100 Myr) and two of them resemble tidal dwarf galaxies (TDGs) candidates. We suggest that they were created within gas clouds that were ejected during galaxy-galaxy 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 6 interacting systems with extended HI tails, NGC 2623, NGC 3079, NGC 3359, NGC 3627, NGC 3718, NGC 4656. We found 35 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 100. We speculate that this might be an environmental effect and that compact groups of galaxies are more favorable to TDG formation than other interacting systems.
Document ID
20120015540
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
deMello, D. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Urrutia-Viscarra, F.
(Cidade Univ. Sao Paulo, Brazil)
MendesdeOliveira, C.
(Cidade Univ. Sao Paulo, Brazil)
Torres-Flores, S.
(Universidad de La Serena La Serena, Chile)
Carrasco, E. R.
(Gemini Observatory La Serena, Chile)
Cypriano, E.
(Cidade Univ. Sao Paulo, Brazil)
Date Acquired
August 26, 2013
Publication Date
January 1, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.7070.2012
Report Number: GSFC.JA.7070.2012
Funding Number(s)
CONTRACT_GRANT: FONDECYT 3110087
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: FAPESP 2007/07973-3
CONTRACT_GRANT: NNG06GG59G
CONTRACT_GRANT: FAPESP 2007/06436-4
CONTRACT_GRANT: NNG06GG45G
CONTRACT_GRANT: NAG5-7584
Distribution Limits
Public
Copyright
Public Use Permitted.
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