A search for H <scp>i</scp> absorption in distant star-forming galaxies with ASKAP-FLASH – I. Selection and analysis of the radio sample

ABSTRACT We present and discuss two catalogues of ultraviolet (UV)-selected (near-UV (NUV)$\lt 22.8$ mag) galaxies that lie within a 200 deg$^2$ area of sky covered by the ASKAP First Large Absorption Survey in H i (FLASH) and have an impact parameter of less than 20 arcsec to a FLASH radio continuum source. These catalogues are designed to enable a future search for 21 cm H i absorption in and around star-forming galaxies at redshift $0.4\lt z\lt 1$. We outline the production of this UV-bright data set, which has optical spectroscopy from the WiggleZ and Sloan Digital Sky Survey (SDSS) surveys and a median redshift of ${\sim} 0.6$. Analysis of the optical spectra, using multiple diagnostic diagrams, shows that galaxies with an impact parameter of less than 5 arcsec are likely to be physically associated with the radio source and are five times more likely to be an active galactic nucleus than objects without a radio match. Conversely, objects with impact factors between 5 and 20 arcsec are largely (&amp;gt;80 per cent) star-forming and resemble the overall WiggleZ population. The ($g - i$) colour evolution with redshift is consistent with a history of active star formation, but the radio-associated objects are typically redder and have colours similar to high-excitation radio galaxies. The redshift distribution of the two catalogues matches the overall distribution for WiggleZ galaxies, despite their otherwise rare radio properties. These catalogues can be expanded in future as new radio data become available, and a forthcoming paper will present the H i absorption results.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-11-15
DOI
https://doi.org/10.1093/mnras/stae2581
Citations
3
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
Field-Weighted Citation Impact
0.99

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article

A search for H i absorption in distant star-forming galaxies with ASKAP-FLASH – I. Selection and analysis of the radio sample

Kevin A. Pimbblet, E. K. Mahony, E. M. Sadler, Hyein Yoon et al.
3 citations
Monthly Notices of the Royal Astronomical Society
Galaxies: Formation, Evolution, Phenomena
0.99
article

A search for H i absorption in distant star-forming galaxies with ASKAP-FLASH – I. Selection and analysis of the radio sample

Kevin A. Pimbblet, E. K. Mahony, E. M. Sadler, Hyein Yoon, Sally Eden
article en
3 citations

Abstract

ABSTRACT We present and discuss two catalogues of ultraviolet (UV)-selected (near-UV (NUV)$\lt 22.8$ mag) galaxies that lie within a 200 deg$^2$ area of sky covered by the ASKAP First Large Absorption Survey in H i (FLASH) and have an impact parameter of less than 20 arcsec to a FLASH radio continuum source. These catalogues are designed to enable a future search for 21 cm H i absorption in and around star-forming galaxies at redshift $0.4\lt z\lt 1$. We outline the production of this UV-bright data set, which has optical spectroscopy from the WiggleZ and Sloan Digital Sky Survey (SDSS) surveys and a median redshift of ${\sim} 0.6$. Analysis of the optical spectra, using multiple diagnostic diagrams, shows that galaxies with an impact parameter of less than 5 arcsec are likely to be physically associated with the radio source and are five times more likely to be an active galactic nucleus than objects without a radio match. Conversely, objects with impact factors between 5 and 20 arcsec are largely (&amp;gt;80 per cent) star-forming and resemble the overall WiggleZ population. The ($g - i$) colour evolution with redshift is consistent with a history of active star formation, but the radio-associated objects are typically redder and have colours similar to high-excitation radio galaxies. The redshift distribution of the two catalogues matches the overall distribution for WiggleZ galaxies, despite their otherwise rare radio properties. These catalogues can be expanded in future as new radio data become available, and a forthcoming paper will present the H i absorption results.

Monthly Notices of the Royal Astronomical SocietyVol. 536(1)
Commonwealth Scientific and Industrial Research Organisation (AU), The University of Sydney (AU), Seoul National University (KR), University of Hull (GB), Astronomy and Space (AU), ARC Centre of Excellence for All-sky Astrophysics (AU)
National Science Foundation, Smithsonian Institution, U.S. Department of Energy, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, Yale University, Stanford University, Carnegie Institution of Washington, Vanderbilt University, New York University, Princeton University, University of Pennsylvania, Ohio State University, University of Wisconsin-Madison, Harvard University, University of Chicago, University of Michigan, University of Florida, University of Utah, University of Washington, Johns Hopkins University, University of Arizona, Texas A and M University, Carnegie Mellon University, University of Notre Dame, Pennsylvania State University, University of Virginia, University of Portsmouth, New Mexico State University, Space Telescope Science Institute, York University, University of Cambridge, University College London, University of Oxford, University of Nottingham, University of Sussex, University of Edinburgh, National Research Foundation, Deutsche Forschungsgemeinschaft, Chinese Academy of Sciences, Ministério da Ciência, Tecnologia e Inovação, National Research Foundation of Korea, University of Tokyo, Financiadora de Estudos e Projetos, Universidad Nacional Autónoma de México, Max-Planck-Institut für Astrophysik, Max-Planck-Institut für Astronomie, Instituto de Astrofísica de Canarias, University of Illinois at Urbana-Champaign, Office of Science, Jet Propulsion Laboratory, College of Engineering, Michigan State University, University of Colorado Boulder, National Science Foundation, United Arab Emirates, Science and Technology Facilities Council, Australian Research Council, Leibniz-Gemeinschaft, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
Openalex Percentile: Top 23%
Galaxies: Formation, Evolution, Phenomena
0.99
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