The FLASH pilot survey: an H i absorption search against MRC 1-Jy radio sources

Author:

Aditya J N H S12ORCID,Yoon Hyein12,Allison James R23ORCID,An Tao45ORCID,Chhetri Rajan67ORCID,Curran Stephen J8,Darling Jeremy9,Emig Kimberly L10,Glowacki Marcin11ORCID,Kerrison Emily1212ORCID,Koribalski Bärbel S1213ORCID,Mahony Elizabeth K12ORCID,Moss Vanessa A12,Morgan John7,Sadler Elaine M1212ORCID,Soria Roberto11415ORCID,Su Renzhi4512,Weng Simon12ORCID,Whiting Matthew12

Affiliation:

1. Sydney Institute for Astronomy, School of Physics A28, University of Sydney , NSW 2006 , Australia

2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Sydney , Australia

3. First Light Fusion Ltd , Unit 9/10 Oxford Pioneer Park, Mead Road, Yarnton, Kidlington OX5 1QU , UK

4. Shanghai Astronomical Observatory , 80 Nandan Road, Shanghai 200030 , China

5. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049 , China

6. ATNF, CSIRO Space and Astronomy , P.O. Box 1130, Bentley, WA 6102 , Australia

7. International Centre for Radio Astronomy Research, Curtin University , GPO Box U1987, Perth, WA 6845 , Australia

8. School of Chemical and Physical Sciences, Victoria University of Wellington , PO Box 600, Wellington 6140 , New Zealand

9. Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado , 389 UCB, Boulder, CO 80309-0389 , USA

10. National Radio Astronomy Observatory , 520 Edgemont Road, Charlottesville, VA 22903 , USA

11. International Centre for Radio Astronomy Research (ICRAR), Curtin University , Bentley, WA 6102 , Australia

12. ATNF, CSIRO Space and Astronomy , PO Box 76, Epping, NSW 1710 , Australia

13. School of Science, Western Sydney University , Locked Bag 1797, Penrith, NSW 2751 , Australia

14. INAF – Osservatorio Astrofisico di Torino , Strada Osservatorio 20, I-10025 Pino Torinese , Italy

15. College of Astronomy and Space Sciences, University of the Chinese Academy of Sciences , Beijing 100049 , China

Abstract

ABSTRACT We report an ASKAP search for associated H i 21-cm absorption against bright radio sources from the Molonglo Reference Catalogue (MRC) 1-Jy sample. The search uses pilot survey data from the ASKAP First Large Absorption Survey in H i (FLASH) covering the redshift range 0.42 < z < 1.00. From a sample of 62 MRC 1-Jy radio galaxies and quasars, we report three new detections of associated H i 21-cm absorption, yielding an overall detection fraction of $1.8\,{{\,\rm per\,cent}}^{+4.0\,{{\,\rm per\,cent}}}_{-1.5\,{{\,\rm per\,cent}}}$. The detected systems comprise two radio galaxies (MRC 2216−281 at z = 0.657 and MRC 0531−237 at z = 0.851) and one quasar (MRC 2156−245 at z = 0.862). The MRC 0531−237 absorption system is the strongest found to date, with a velocity integrated optical depth of $\rm 143.8 \pm 0.4 \ km \ s^{-1}$. All three objects with detected H i 21-cm absorption are peaked-spectrum or compact steep-spectrum (CSS) radio sources. Two of them show strong interplanetary scintillation at 162 MHz, implying that the radio continuum source is smaller than 1 arcsec in size even at low frequencies. Among the class of peaked-spectrum and compact steep-spectrum radio sources, the H i detection fraction is $23\,{{\,\rm per\,cent}}^{+22\,{{\,\rm per\,cent}}}_{-13\,{{\,\rm per\,cent}}}$. All three detections have a high 1.4 GHz radio luminosity, with MRC 0531−237 and MRC 2216−281 having the highest values in the sample, $\rm \gt 27.5 \ W \ Hz^{-1}$. The preponderance of extended radio sources in our sample could partially explain the overall low detection fraction, while the effects of a redshift evolution in gas properties and AGN UV luminosity on the neutral gas absorption still need to be investigated.

Funder

Science and Industry Endowment Fund

Australian Research Council

Curtin University

Astronomy Australia Limited

National Aeronautics and Space Administration

California Institute of Technology

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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1. radiosed – I. Bayesian inference of radio SEDs from inhomogeneous surveys;Monthly Notices of the Royal Astronomical Society;2024-07-25

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