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WALLABY Early Science – II. The NGC 7232 galaxy group.
- Source :
- Monthly Notices of the Royal Astronomical Society; 8/21/2019, Vol. 487 Issue 4, p5248-5262, 15p
- Publication Year :
- 2019
-
Abstract
- We report on neutral hydrogen (H i) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 deg<superscript>2</superscript>. Analysing a subregion of the central beams, we detect 17 H i sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved H i galaxy sources. The other six detections appear to be tidal debris in the form of H i clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B, and NGC 7233. One of these H i clouds has a mass of M<subscript>H i </subscript> ∼ 3 × 10<superscript>8</superscript> M<subscript>⊙</subscript> and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining H i clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181. [ABSTRACT FROM AUTHOR]
- Subjects :
- GALAXY clusters
DWARF galaxies
PHASED array antennas
SPIRAL galaxies
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 487
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 137668139
- Full Text :
- https://doi.org/10.1093/mnras/stz017