FLASH pilot survey: detections of associated 21 cm H i absorption in GAMA galaxies at 0.42 < z < 1.00
Abstract
ABSTRACT We present the results of a search for associated 21 cm H i absorption at redshift 0.42 < z < 1.00 in radio-loud galaxies from three Galaxy And Mass Assembly (GAMA) survey fields. These observations were carried out as part of a pilot survey for the Australian SKA Pathfinder (ASKAP) First Large Absorption Survey in H i (FLASH). From a sample of 326 radio sources with 855.5 MHz peak flux density above 10 mJy, we detected two associated H i absorption systems, in SDSS J090331+010847 at z = 0.522 and SDSS J113622+004852 at z = 0.563. Both galaxies are massive (stellar mass $$\gt 10^{11}\, \mathrm{M}_\odot$$) and have optical spectra characteristic of luminous red galaxies, though spectral energy distribution fitting implies that SDSS J113622+004852 contains a dust-obscured starburst with star formation rate ∼69 M⊙ yr−1. The H i absorption lines have a high optical depth, with τpk of 1.77 ± 0.16 for SDSS J090331+010847 (the highest value for any z > 0.1 associated system found to date) and 0.14 ± 0.01 for SDSS J113622+004852. In the redshift range probed by our ASKAP observations, the detection rate for associated H i absorption lines (with τpk > 0.1 and at least 3σ significance) is $$2.9_{-2.6}^{+9.7}$$ per cent. Although the current sample is small, this rate is consistent with a trend seen in other studies for a lower detection rate of associated 21 cm H i absorption systems at higher redshift. We also searched for OH absorption lines at 0.67 < z < 1.34, but no detection was made in the 145 radio sources searched.
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); Alfred P. Sloan Foundation; University of Utah; National Science Foundation of China; Chinese Academy of Science; China Manned Space Project; National Science Foundation (NSF)
- OSTI Identifier:
- 1887319
- Alternate Identifier(s):
- OSTI ID: 1982651
- Grant/Contract Number:
- AC02-05CH1123; AC02-05CH11231; grant 11873073; JCYJ-SHFY-2021-013; 12073029; CMSCSST-2021-A06; AST-0950945
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 516 Journal Issue: 2; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; methods; observational; galaxies; active; ISM; nuclei; radio lines
Citation Formats
Su, Renzhi, Sadler, Elaine M., Allison, James R., Mahony, Elizabeth K., Moss, Vanessa A., Whiting, Matthew T., Yoon, Hyein, Aditya, J. N. H. S., Bellstedt, Sabine, Robotham, Aaron S. G., Garratt-Smithson, Lilian, Gu, Minfeng, Koribalski, Bärbel S., Soria, Roberto, and Weng, Simon. FLASH pilot survey: detections of associated 21 cm H i absorption in GAMA galaxies at 0.42 < z < 1.00. United Kingdom: N. p., 2022.
Web. doi:10.1093/mnras/stac2257.
Su, Renzhi, Sadler, Elaine M., Allison, James R., Mahony, Elizabeth K., Moss, Vanessa A., Whiting, Matthew T., Yoon, Hyein, Aditya, J. N. H. S., Bellstedt, Sabine, Robotham, Aaron S. G., Garratt-Smithson, Lilian, Gu, Minfeng, Koribalski, Bärbel S., Soria, Roberto, & Weng, Simon. FLASH pilot survey: detections of associated 21 cm H i absorption in GAMA galaxies at 0.42 < z < 1.00. United Kingdom. https://doi.org/10.1093/mnras/stac2257
Su, Renzhi, Sadler, Elaine M., Allison, James R., Mahony, Elizabeth K., Moss, Vanessa A., Whiting, Matthew T., Yoon, Hyein, Aditya, J. N. H. S., Bellstedt, Sabine, Robotham, Aaron S. G., Garratt-Smithson, Lilian, Gu, Minfeng, Koribalski, Bärbel S., Soria, Roberto, and Weng, Simon. Thu .
"FLASH pilot survey: detections of associated 21 cm H i absorption in GAMA galaxies at 0.42 < z < 1.00". United Kingdom. https://doi.org/10.1093/mnras/stac2257.
@article{osti_1887319,
title = {FLASH pilot survey: detections of associated 21 cm H i absorption in GAMA galaxies at 0.42 < z < 1.00},
author = {Su, Renzhi and Sadler, Elaine M. and Allison, James R. and Mahony, Elizabeth K. and Moss, Vanessa A. and Whiting, Matthew T. and Yoon, Hyein and Aditya, J. N. H. S. and Bellstedt, Sabine and Robotham, Aaron S. G. and Garratt-Smithson, Lilian and Gu, Minfeng and Koribalski, Bärbel S. and Soria, Roberto and Weng, Simon},
abstractNote = {ABSTRACT We present the results of a search for associated 21 cm H i absorption at redshift 0.42 < z < 1.00 in radio-loud galaxies from three Galaxy And Mass Assembly (GAMA) survey fields. These observations were carried out as part of a pilot survey for the Australian SKA Pathfinder (ASKAP) First Large Absorption Survey in H i (FLASH). From a sample of 326 radio sources with 855.5 MHz peak flux density above 10 mJy, we detected two associated H i absorption systems, in SDSS J090331+010847 at z = 0.522 and SDSS J113622+004852 at z = 0.563. Both galaxies are massive (stellar mass $\gt 10^{11}\, \mathrm{M}_\odot$) and have optical spectra characteristic of luminous red galaxies, though spectral energy distribution fitting implies that SDSS J113622+004852 contains a dust-obscured starburst with star formation rate ∼69 M⊙ yr−1. The H i absorption lines have a high optical depth, with τpk of 1.77 ± 0.16 for SDSS J090331+010847 (the highest value for any z > 0.1 associated system found to date) and 0.14 ± 0.01 for SDSS J113622+004852. In the redshift range probed by our ASKAP observations, the detection rate for associated H i absorption lines (with τpk > 0.1 and at least 3σ significance) is $2.9_{-2.6}^{+9.7}$ per cent. Although the current sample is small, this rate is consistent with a trend seen in other studies for a lower detection rate of associated 21 cm H i absorption systems at higher redshift. We also searched for OH absorption lines at 0.67 < z < 1.34, but no detection was made in the 145 radio sources searched.},
doi = {10.1093/mnras/stac2257},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 516,
place = {United Kingdom},
year = {Thu Aug 18 00:00:00 EDT 2022},
month = {Thu Aug 18 00:00:00 EDT 2022}
}
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