NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-18 T07:01:36 PDT
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For refcode 2015MNRAS.451.2793E:
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Copyright by Royal Astronomical Society. 2015MNRAS.451.2793E Star formation properties of Hickson Compact Groups based on deep Halpha imaging Eigenthaler, Paul; Ploeckinger, Sylvia; Verdugo, Miguel; Ziegler, Bodo Abstract. We present deep Halpha imaging of seven Hickson Compact Groups (HCGs) using the 4.1-m Southern Astrophysics Research (SOAR) Telescope. The high spatial resolution of the observations allows us to study both the integrated star formation properties of the main galaxies as well as the 2D distribution of star-forming knots in the faint tidal arms that form during interactions between the individual galaxies. We derive star formation rates and stellar masses for group members and discuss their position relative to the main sequence of star-forming galaxies. Despite the existence of tidal features within the galaxy groups, we do not find any indication for enhanced star formation in the selected sample of HCGs. We study azimuthally averaged Halpha profiles of the galaxy discs and compare them with the g' and r' surface brightness profiles. We do not find any truncated galaxy discs but reveal that more massive galaxies show a higher light concentration in Halpha than less massive ones. We also see that galaxies that show a high light concentration in r', show a systematic higher light concentration in Halpha. Tidal dwarf galaxy (TDG) candidates have been previously detected in R-band images for two groups in our sample but we find that most of them are likely background objects as they do not show any emission in Halpha. We present a new TDG candidate at the tip of the tidal tail in HCG 91. Key words: galaxies: evolution, galaxies: groups: general, galaxies: interactions, galaxies: photometry
Retrieve 54 NED objects in this reference.
Please click here for ADS abstract

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