A deep parkes HI survey of the sculptor group and filament: HI mass function and environment

Westmeier, T., Obreschkow, D., Calabretta, M., Jurek, R., Koribalski, B. S., Meyer, M., Musaeva, A., Popping, A., Staveley-Smith, L., Wong, O. I. and Wright, A. (2017) A deep parkes HI survey of the sculptor group and filament: HI mass function and environment. Monthly Notices of the Royal Astronomical Society, 472 4: 4832-4850. doi:10.1093/mnras/stx2289

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Author Westmeier, T.
Obreschkow, D.
Calabretta, M.
Jurek, R.
Koribalski, B. S.
Meyer, M.
Musaeva, A.
Popping, A.
Staveley-Smith, L.
Wong, O. I.
Wright, A.
Title A deep parkes HI survey of the sculptor group and filament: HI mass function and environment
Formatted title
A deep parkes H I survey of the sculptor group and filament: H I mass function and environment
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2017-12-01
Year available 2017
Sub-type Article (original research)
DOI 10.1093/mnras/stx2289
Open Access Status File (Publisher version)
Volume 472
Issue 4
Start page 4832
End page 4850
Total pages 19
Place of publication Great Clarendon St, Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Abstract We present the results of a deep survey of the nearby Sculptor group and the associated Sculptor filament taken with the Parkes 64-m radio telescope in the 21-cm emission line of neutral hydrogen. We detect 31 HI sources in the Sculptor group/filament, eight of which are new HI detections. We derive a slope of the HI mass function along the Sculptor filament of alpha = -1.10(-0.11)(+0.20), which is significantly flatter than the global mass function and consistent with the flat slopes previously found in other low-density group environments. Some physical process, such as star formation, photoionization or ram-pressure stripping, must therefore be responsible for removing neutral gas predominantly from low-mass galaxies. All of our HI detections have a confirmed or tentative optical counterpart and are likely associated with luminous rather than 'dark' galaxies. Despite a column density sensitivity of about 4 x 10(17) cm(-2), we do not find any traces of extragalactic gas or tidal streams, suggesting that the Sculptor filament is, at the current time, a relatively quiescent environment that has not seen any recent major interactions or mergers.
Keyword Fast-Alpha Survey
Brightest Hipass Galaxies
I-Deficient Galaxies
Cold Dark-Matter
Star-Formation
Local Group
Virgo Cluster
Neutral Hydrogen
Atomic-Hydrogen
Nearby Groups
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID NAG W-2166
Institutional Status UQ
Additional Notes This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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Created: Sat, 09 Dec 2017, 23:19:52 EST