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- Publisher Website: 10.1111/j.1365-2966.2003.07134.x
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Article: HIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen
Title | HIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen |
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Authors | |
Keywords | Surveys Radio lines: galaxies Galaxies: distances and redshifts |
Issue Date | 2003 |
Citation | Monthly Notices of the Royal Astronomical Society, 2003, v. 346, n. 3, p. 787-802 How to Cite? |
Abstract | We 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 Identifier | http://hdl.handle.net/10722/208836 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Minchin, Robert F. | - |
dc.contributor.author | Disney, Michael J. | - |
dc.contributor.author | Boyce, Peter J. | - |
dc.contributor.author | De Blök, W. J G | - |
dc.contributor.author | Parker, Quentin A. | - |
dc.contributor.author | Banks, Gareth D. | - |
dc.contributor.author | Freeman, Kenneth C. | - |
dc.contributor.author | Garcia, Diego A. | - |
dc.contributor.author | Gibson, Brad K. | - |
dc.contributor.author | Grossi, Marco | - |
dc.contributor.author | Haynes, Raymond F. | - |
dc.contributor.author | Knezek, Patricia M. | - |
dc.contributor.author | Lang, Robert | - |
dc.contributor.author | Malin, David F. | - |
dc.contributor.author | Price, Rob Marcus | - |
dc.contributor.author | Stewart, Ian M. | - |
dc.contributor.author | Wright, Alan E. | - |
dc.date.accessioned | 2015-03-23T02:01:52Z | - |
dc.date.available | 2015-03-23T02:01:52Z | - |
dc.date.issued | 2003 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2003, v. 346, n. 3, p. 787-802 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/208836 | - |
dc.description.abstract | We 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.language | eng | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.subject | Surveys | - |
dc.subject | Radio lines: galaxies | - |
dc.subject | Galaxies: distances and redshifts | - |
dc.title | HIDEEP - An extragalactic blind survey for very low column-density neutral hydrogen | - |
dc.type | Article | - |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1111/j.1365-2966.2003.07134.x | - |
dc.identifier.scopus | eid_2-s2.0-17544390057 | - |
dc.identifier.volume | 346 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 787 | - |
dc.identifier.epage | 802 | - |
dc.identifier.isi | WOS:000186912700011 | - |
dc.identifier.issnl | 0035-8711 | - |