Australia Telescope Compact Array H I observations of the NGC 6845 galaxy group

Gordon, S., Koribalski, B. and Jones, K. (2003) Australia Telescope Compact Array H I observations of the NGC 6845 galaxy group. Monthly Notices of The Royal Astronomical Society, 342 3: 939-950. doi:10.1046/j.1365-8711.2003.06606.x


Author Gordon, S.
Koribalski, B.
Jones, K.
Title Australia Telescope Compact Array H I observations of the NGC 6845 galaxy group
Journal name Monthly Notices of The Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1046/j.1365-8711.2003.06606.x
Open Access Status DOI
Volume 342
Issue 3
Start page 939
End page 950
Total pages 12
Editor A C Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We present the results of Australia Telescope Compact Array (ATCA) H i line and 20-cm radio continuum observations of the galaxy quartet NGC 6845. The H i emission extends over all four galaxies but can only be associated clearly with the two spiral galaxies, NGC 6845A and B, which show signs of strong tidal interaction. We derive a total H i mass of at least 1.8 x 10(10) M-., most of which is associated with NGC 6845A, the largest galaxy of the group. We investigate the tidal interaction between NGC 6845A and B by studying the kinematics of distinct H i components and their relation to the known H ii regions. No H i emission is detected from the two lenticular galaxies, NGC 6845C and D. A previously uncatalogued dwarf galaxy, ATCA J2001-4659, was detected 4.4 arcmin NE from NGC 6845B and has an H i mass of similar to5 x 10(8) M-.. No H i bridge is visible between the group and its newly detected companion. Extended 20-cm radio continuum emission is detected in NGC 6845A and B as well as in the tidal bridge between the two galaxies. We derive star formation rates of 15-40 M-. yr(-1).
Keyword Astronomy & Astrophysics
Galaxies
Radio Continuum
Radio Lines
Star-formation
Radio-sources
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 12:50:55 EST