The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design
We describe the scientific goals and survey design of the First Large Absorption Survey in H i (FLASH), a wide field survey for 21-cm line absorption in neutral atomic hydrogen (H i) at intermediate cosmological redshifts. FLASH will be carried out with the Australian Square Kilometre Array Pathfind...
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| Format: | Journal Article |
| Language: | English |
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CAMBRIDGE UNIV PRESS
2022
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| Online Access: | https://arxiv.org/abs/2110.00469 http://hdl.handle.net/20.500.11937/91564 |
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| author | Allison, J.R. Sadler, E.M. Amaral, A.D. An, T. Curran, S.J. Darling, J. Edge, A.C. Ellison, S.L. Emig, K.L. Gaensler, B.M. Garratt-Smithson, L. Glowacki, Marcin Grasha, K. Koribalski, B.S. Lagos, C.D.P. Lah, P. Mahony, E.K. Mao, S.A. Morganti, R. Moss, V.A. Pettini, M. Pimbblet, K.A. Power, C. Salas, P. Staveley-Smith, L. Whiting, M.T. Wong, O.I. Yoon, H. Zheng, Z. Zwaan, M.A. |
| author_facet | Allison, J.R. Sadler, E.M. Amaral, A.D. An, T. Curran, S.J. Darling, J. Edge, A.C. Ellison, S.L. Emig, K.L. Gaensler, B.M. Garratt-Smithson, L. Glowacki, Marcin Grasha, K. Koribalski, B.S. Lagos, C.D.P. Lah, P. Mahony, E.K. Mao, S.A. Morganti, R. Moss, V.A. Pettini, M. Pimbblet, K.A. Power, C. Salas, P. Staveley-Smith, L. Whiting, M.T. Wong, O.I. Yoon, H. Zheng, Z. Zwaan, M.A. |
| author_sort | Allison, J.R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We describe the scientific goals and survey design of the First Large Absorption Survey in H i (FLASH), a wide field survey for 21-cm line absorption in neutral atomic hydrogen (H i) at intermediate cosmological redshifts. FLASH will be carried out with the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope and is planned to cover the sky south of at frequencies between 711.5 and 999.5 MHz. At redshifts between and (look-back times of 4-8 Gyr), the H i content of the Universe has been poorly explored due to the difficulty of carrying out radio surveys for faint 21-cm line emission and, at ultra-violet wavelengths, space-borne searches for Damped Lyman-absorption in quasar spectra. The ASKAP wide field of view and large spectral bandwidth, in combination with a radio-quiet site, will enable a search for absorption lines in the radio spectra of bright continuum sources over 80% of the sky. This survey is expected to detect at least several hundred intervening 21-cm absorbers and will produce an H i-absorption-selected catalogue of galaxies rich in cool, star-forming gas, some of which may be concealed from optical surveys. Likewise, at least several hundred associated 21-cm absorbers are expected to be detected within the host galaxies of radio sources at <![CDATA[$0.4 < z, providing valuable kinematical information for models of gas accretion and jet-driven feedback in radio-loud active galactic nuclei. FLASH will also detect OH 18-cm absorbers in diffuse molecular gas, megamaser OH emission, radio recombination lines, and stacked H i emission. |
| first_indexed | 2025-11-14T11:37:01Z |
| format | Journal Article |
| id | curtin-20.500.11937-91564 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:37:01Z |
| publishDate | 2022 |
| publisher | CAMBRIDGE UNIV PRESS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-915642023-05-16T05:21:28Z The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design Allison, J.R. Sadler, E.M. Amaral, A.D. An, T. Curran, S.J. Darling, J. Edge, A.C. Ellison, S.L. Emig, K.L. Gaensler, B.M. Garratt-Smithson, L. Glowacki, Marcin Grasha, K. Koribalski, B.S. Lagos, C.D.P. Lah, P. Mahony, E.K. Mao, S.A. Morganti, R. Moss, V.A. Pettini, M. Pimbblet, K.A. Power, C. Salas, P. Staveley-Smith, L. Whiting, M.T. Wong, O.I. Yoon, H. Zheng, Z. Zwaan, M.A. Science & Technology Physical Sciences Astronomy & Astrophysics galaxies: active galaxies: ISM methods: observational radio continuum: general radio lines: galaxies surveys 21 CM ABSORPTION ACTIVE GALACTIC NUCLEI RADIO RECOMBINATION LINES SUPERMASSIVE BLACK-HOLES ALMA SPECTROSCOPIC SURVEY TO-MOLECULAR TRANSITION LYMAN-ALPHA SYSTEMS NEUTRAL HYDROGEN ABSORPTION ADAPTIVE MESH REFINEMENT FARADAY-ROTATION MEASURE astro-ph.GA astro-ph.GA We describe the scientific goals and survey design of the First Large Absorption Survey in H i (FLASH), a wide field survey for 21-cm line absorption in neutral atomic hydrogen (H i) at intermediate cosmological redshifts. FLASH will be carried out with the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope and is planned to cover the sky south of at frequencies between 711.5 and 999.5 MHz. At redshifts between and (look-back times of 4-8 Gyr), the H i content of the Universe has been poorly explored due to the difficulty of carrying out radio surveys for faint 21-cm line emission and, at ultra-violet wavelengths, space-borne searches for Damped Lyman-absorption in quasar spectra. The ASKAP wide field of view and large spectral bandwidth, in combination with a radio-quiet site, will enable a search for absorption lines in the radio spectra of bright continuum sources over 80% of the sky. This survey is expected to detect at least several hundred intervening 21-cm absorbers and will produce an H i-absorption-selected catalogue of galaxies rich in cool, star-forming gas, some of which may be concealed from optical surveys. Likewise, at least several hundred associated 21-cm absorbers are expected to be detected within the host galaxies of radio sources at <![CDATA[$0.4 < z, providing valuable kinematical information for models of gas accretion and jet-driven feedback in radio-loud active galactic nuclei. FLASH will also detect OH 18-cm absorbers in diffuse molecular gas, megamaser OH emission, radio recombination lines, and stacked H i emission. 2022 Journal Article http://hdl.handle.net/20.500.11937/91564 10.1017/pasa.2022.3 English https://arxiv.org/abs/2110.00469 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/DP210102103 CAMBRIDGE UNIV PRESS restricted |
| spellingShingle | Science & Technology Physical Sciences Astronomy & Astrophysics galaxies: active galaxies: ISM methods: observational radio continuum: general radio lines: galaxies surveys 21 CM ABSORPTION ACTIVE GALACTIC NUCLEI RADIO RECOMBINATION LINES SUPERMASSIVE BLACK-HOLES ALMA SPECTROSCOPIC SURVEY TO-MOLECULAR TRANSITION LYMAN-ALPHA SYSTEMS NEUTRAL HYDROGEN ABSORPTION ADAPTIVE MESH REFINEMENT FARADAY-ROTATION MEASURE astro-ph.GA astro-ph.GA Allison, J.R. Sadler, E.M. Amaral, A.D. An, T. Curran, S.J. Darling, J. Edge, A.C. Ellison, S.L. Emig, K.L. Gaensler, B.M. Garratt-Smithson, L. Glowacki, Marcin Grasha, K. Koribalski, B.S. Lagos, C.D.P. Lah, P. Mahony, E.K. Mao, S.A. Morganti, R. Moss, V.A. Pettini, M. Pimbblet, K.A. Power, C. Salas, P. Staveley-Smith, L. Whiting, M.T. Wong, O.I. Yoon, H. Zheng, Z. Zwaan, M.A. The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title | The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title_full | The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title_fullStr | The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title_full_unstemmed | The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title_short | The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design |
| title_sort | first large absorption survey in h i (flash): i. science goals and survey design |
| topic | Science & Technology Physical Sciences Astronomy & Astrophysics galaxies: active galaxies: ISM methods: observational radio continuum: general radio lines: galaxies surveys 21 CM ABSORPTION ACTIVE GALACTIC NUCLEI RADIO RECOMBINATION LINES SUPERMASSIVE BLACK-HOLES ALMA SPECTROSCOPIC SURVEY TO-MOLECULAR TRANSITION LYMAN-ALPHA SYSTEMS NEUTRAL HYDROGEN ABSORPTION ADAPTIVE MESH REFINEMENT FARADAY-ROTATION MEASURE astro-ph.GA astro-ph.GA |
| url | https://arxiv.org/abs/2110.00469 https://arxiv.org/abs/2110.00469 https://arxiv.org/abs/2110.00469 http://hdl.handle.net/20.500.11937/91564 |