A deep Parkes HI survey of the Sculptor group and filament: HI mass function and environment

T. Westmeier, D. Obreschkow, M. Calabretta, R. Jurek, B. S. Koribalski, M. Meyer, A. Musaeva, A. Popping, L. Staveley-Smith, O. I. Wong, A. Wright

Research output: Contribution to journalArticle

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.

LanguageEnglish
Pages4832-4850
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number4
DOIs
StatePublished - Dec 2017

Cite this

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title = "A deep Parkes HI survey of the Sculptor group and filament: HI mass function and environment",
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.",
keywords = "galaxies: evolution, galaxies: groups: individual: Sculptor group, galaxies: ISM, galaxies: luminosity function, mass function, radio lines: galaxies, FAST-ALPHA SURVEY, BRIGHTEST HIPASS GALAXIES, I-DEFICIENT GALAXIES, COLD DARK-MATTER, STAR-FORMATION, LOCAL GROUP, VIRGO CLUSTER, NEUTRAL HYDROGEN, ATOMIC-HYDROGEN, NEARBY GROUPS",
author = "T. Westmeier and D. Obreschkow and M. Calabretta and R. Jurek and Koribalski, {B. S.} and M. Meyer and A. Musaeva and A. Popping and L. Staveley-Smith and Wong, {O. I.} and A. Wright",
year = "2017",
month = "12",
doi = "10.1093/mnras/stx2289",
language = "English",
volume = "472",
pages = "4832--4850",
journal = "Monthly Notices of the Royal Astronomical Society",
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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.; Wright, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 472, No. 4, 12.2017, p. 4832-4850.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A deep Parkes HI survey of the Sculptor group and filament

T2 - Monthly Notices of the Royal Astronomical Society

AU - Westmeier,T.

AU - Obreschkow,D.

AU - Calabretta,M.

AU - Jurek,R.

AU - Koribalski,B. S.

AU - Meyer,M.

AU - Musaeva,A.

AU - Popping,A.

AU - Staveley-Smith,L.

AU - Wong,O. I.

AU - Wright,A.

PY - 2017/12

Y1 - 2017/12

N2 - 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.

AB - 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.

KW - galaxies: evolution

KW - galaxies: groups: individual: Sculptor group

KW - galaxies: ISM

KW - galaxies: luminosity function, mass function

KW - radio lines: galaxies

KW - FAST-ALPHA SURVEY

KW - BRIGHTEST HIPASS GALAXIES

KW - I-DEFICIENT GALAXIES

KW - COLD DARK-MATTER

KW - STAR-FORMATION

KW - LOCAL GROUP

KW - VIRGO CLUSTER

KW - NEUTRAL HYDROGEN

KW - ATOMIC-HYDROGEN

KW - NEARBY GROUPS

U2 - 10.1093/mnras/stx2289

DO - 10.1093/mnras/stx2289

M3 - Article

VL - 472

SP - 4832

EP - 4850

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -