Investigating the Evolutionary and Dynamical State of the Ultra-compact Group CG J1720-67.8

Details Investigating the Evolutionary and Dynamical State of the Ultra-compact Group CG J1720-67.8 Investigating the Evolutionary and Dynamical State of the Ultra-compact Group CG J1720-67.8

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ans...324...44t&link_type=abstract

Astronomische Nachrichten, Supplementary Issue 2, Vol. 324, Short Contributions of the Annual Scientific Meeting of the Astronom

Astronomy and Astrophysics

Astronomy

Scientific paper

Our previous studies of the ultracompact galaxy group CG J1720-67.8 have revealed that its members are undergoing strong mutual interactions, with one of them possibly already the product of a merger, and with several tidal dwarf galaxies possibly in the process of formation. All of these properties suggest that the group is in an advanced evolutionary state. New observations in the radio and optical regimes have been obtained in orther to further investigate the dynamical and evolutionary state of the group. We used the Australia Telescope Compact Array to investigate the neutral hydrogen content of the group, and 20 cm continuum emission to investigate star-formation rates. The group was not detected in the 21 cm line, giving an upper limit to the integrated HI mass of a few 109 M&sun; yr-1. Integral field spectra of two 9''.8x10''.5 regions of the group have been obtained with SPIRAL at the Anglo-Australian Telescope. This allowed measurement of the velocity fields of two of the group's galaxies and one of the tidal dwarf candidates. The Hα velocity field shows a significant degree of distortion in one of the galaxies and apparently confirms that ionized material forms a bridge of matter also visible in the optical continuum.

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