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Article: HIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen

TitleHIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen
Authors
KeywordsSurveys
Radio lines: galaxies
Galaxies: distances and redshifts
Issue Date2003
Citation
Monthly Notices of the Royal Astronomical Society, 2003, v. 346, n. 3, p. 787-802 How to Cite?
AbstractWe have carried out an extremely long integration time (9000 s beam -1) 21-cm blind survey of 60 deg 2 in Centaurus using the Parkes multibeam system. We find that the noise continues to fall as √t obs throughout, enabling us to reach an HI column-density limit of 4.2 × 10 -18 cm -2 for galaxies with a velocity width of 200 km s -1 in the central 32 deg 2 region, making this the deepest survey to date in terms of column density sensitivity. The HI data are complemented by very deep optical observations from digital stacking of multi-exposure UK Schmidt Telescope R-band films, which reach an isophotal level of 26.5 R mag arcsec -2 (≃27.5 B mag arcsec -2). 173 HI sources have been found, 96 of which have been uniquely identified with optical counterparts in the overlap area. There is not a single source without an optical counterpart. Although we have not measured the column densities directly, we have inferred them from the optical sizes of their counterparts. All appear to have a column density of N HI = 10 20.65±0.38 This is at least an order of magnitude above our sensitivity limit, with a scatter only marginally larger than the errors on N HThis needs explaining. If confirmed it means that HI surveys will only find low surface brightness (LSB) galaxies with high M HI/L B. Gas-rich LSB galaxies with lower Hi mass to light ratios do not exist. The paucity of low column-density galaxies also implies that no significant population will be missed by the all-sky HI surveys being carried out at Parkes and Jodrell Bank.
Persistent Identifierhttp://hdl.handle.net/10722/208836
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806

 

DC FieldValueLanguage
dc.contributor.authorMinchin, Robert F.-
dc.contributor.authorDisney, Michael J.-
dc.contributor.authorBoyce, Peter J.-
dc.contributor.authorDe Blök, W. J G-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorBanks, Gareth D.-
dc.contributor.authorFreeman, Kenneth C.-
dc.contributor.authorGarcia, Diego A.-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGrossi, Marco-
dc.contributor.authorHaynes, Raymond F.-
dc.contributor.authorKnezek, Patricia M.-
dc.contributor.authorLang, Robert-
dc.contributor.authorMalin, David F.-
dc.contributor.authorPrice, Rob Marcus-
dc.contributor.authorStewart, Ian M.-
dc.contributor.authorWright, Alan E.-
dc.date.accessioned2015-03-23T02:01:52Z-
dc.date.available2015-03-23T02:01:52Z-
dc.date.issued2003-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2003, v. 346, n. 3, p. 787-802-
dc.identifier.issn0035-8711-
dc.identifier.urihttp://hdl.handle.net/10722/208836-
dc.description.abstractWe have carried out an extremely long integration time (9000 s beam -1) 21-cm blind survey of 60 deg 2 in Centaurus using the Parkes multibeam system. We find that the noise continues to fall as √t obs throughout, enabling us to reach an HI column-density limit of 4.2 × 10 -18 cm -2 for galaxies with a velocity width of 200 km s -1 in the central 32 deg 2 region, making this the deepest survey to date in terms of column density sensitivity. The HI data are complemented by very deep optical observations from digital stacking of multi-exposure UK Schmidt Telescope R-band films, which reach an isophotal level of 26.5 R mag arcsec -2 (≃27.5 B mag arcsec -2). 173 HI sources have been found, 96 of which have been uniquely identified with optical counterparts in the overlap area. There is not a single source without an optical counterpart. Although we have not measured the column densities directly, we have inferred them from the optical sizes of their counterparts. All appear to have a column density of N HI = 10 20.65±0.38 This is at least an order of magnitude above our sensitivity limit, with a scatter only marginally larger than the errors on N HThis needs explaining. If confirmed it means that HI surveys will only find low surface brightness (LSB) galaxies with high M HI/L B. Gas-rich LSB galaxies with lower Hi mass to light ratios do not exist. The paucity of low column-density galaxies also implies that no significant population will be missed by the all-sky HI surveys being carried out at Parkes and Jodrell Bank.-
dc.languageeng-
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society-
dc.subjectSurveys-
dc.subjectRadio lines: galaxies-
dc.subjectGalaxies: distances and redshifts-
dc.titleHIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1365-2966.2003.07134.x-
dc.identifier.scopuseid_2-s2.0-17544390057-
dc.identifier.volume346-
dc.identifier.issue3-
dc.identifier.spage787-
dc.identifier.epage802-

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