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The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design

Published online by Cambridge University Press:  21 March 2022

James R. Allison*
Affiliation:
Sub-Dept. of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Rd., Oxford, OX1 3RH, UK ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D)
E. M. Sadler
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia
A. D. Amaral
Affiliation:
David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto, ON, M5S 3H4, Canada Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, ON, M5S 3H4, Canada
T. An
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Nandan Road 80, Shanghai 200030, China Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China
S. J. Curran
Affiliation:
School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
J. Darling
Affiliation:
CASA, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389, USA
A. C. Edge
Affiliation:
Centre for Extragalactic Astronomy, Durham University, Durham, DH1 3LE, UK
S. L. Ellison
Affiliation:
Department of Physics & Astronomy, University of Victoria, Finnerty Road, Victoria, British Columbia, V8P 1A1, Canada
K. L. Emig
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
B. M. Gaensler
Affiliation:
David A. Dunlap Department of Astronomy and Astrophysics, University of Toronto, ON, M5S 3H4, Canada Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, ON, M5S 3H4, Canada
L. Garratt-Smithson
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) ICRAR, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
M. Glowacki
Affiliation:
ICRAR, Curtin University, Bentley, WA 6102, Australia Inter-University Institute for Data Intensive Astronomy, Bellville 7535, South Africa
K. Grasha
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
B. S. Koribalski
Affiliation:
Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
C. del P. Lagos
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) Inter-University Institute for Data Intensive Astronomy, Bellville 7535, South Africa
P. Lah
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
E. K. Mahony
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia
S. A. Mao
Affiliation:
Max Planck Institute for Radio Astronomy, Auf dem Hügel 69, Bonn D-53121, Germany
R. Morganti
Affiliation:
ASTRON, the Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
V. A. Moss
Affiliation:
Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia
M. Pettini
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
K. A. Pimbblet
Affiliation:
E.A.Milne Centre for Astrophysics, University of Hull, Cottingham Road, Kingston-upon-Hull, HU6 7RX, UK
C. Power
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) ICRAR, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
P. Salas
Affiliation:
Green Bank Observatory, 155 Observatory Road, Green Bank, WV 24915, USA
L. Staveley-Smith
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) ICRAR, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
M. T. Whiting
Affiliation:
Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 76, Epping, NSW 1710, Australia
O. I. Wong
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) ICRAR, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia Australia Telescope National Facility, CSIRO, Space and Astronomy, PO Box 1130, Bentley, WA 6102, Australia
H. Yoon
Affiliation:
ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia
Z. Zheng
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, China
M. A. Zwaan
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany
*
Corresponding author: James R. Allison, email: james.allison@physics.ox.ac.uk

Abstract

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 $\delta \approx +40\,\deg$ at frequencies between 711.5 and 999.5 MHz. At redshifts between $z = 0.4$ and $1.0$ (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- $\alpha$ 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 $0.4 < z < 1.0$ , 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.

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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Footnotes

*

Jansky Fellow of the National Radio Astronomy Observatory

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