H i 21-cm absorption in radio-loud AGN with double-peaked [O iii ] emission
Abstract
Different physical processes in galaxy evolution, such as galaxy mergers that lead to coalescence of dual Active Galactic Nuclei (AGN) and outflows emanating from the narrow line region, can leave their imprint on the optical spectra of AGN in the form of double-peaked narrow emission lines. To investigate the neutral gas in the centres of such AGN, we have conducted a pilot survey of H I 21-cm absorption, using the upgraded Giant Metrewave Radio Telescope (uGMRT), in radio-loud AGN whose optical spectra show double-peaked [O III] emission lines at z ≤ 0.4 (median z ≈ 0.14). Among the eight sources for which we could obtain clean spectra, we detect H I 21-cm absorption in three sources (detection rate of $$38^{+36}_{-20}$$ per cent) and find tentative indication of absorption in two other sources. Here, the detection rate of H I 21-cm absorption is tentatively higher for the systems that show signatures of interaction or tidal disturbance (≳ 50 per cent) in the ground-based optical images than that for the systems that appear single and undisturbed (≈25 per cent). This is consistent with the high incidence of H I 21-cm absorption observed in z ≤ 0.2 galaxy mergers. Higher spatial resolution spectroscopy is required to confirm the origin of the H I absorbing gas, i.e. either gas infalling on to the radio-loud AGN, outflowing gas ejected by the AGN, or gas in rotation on the galactic-scale or circumnuclear discs.
- Publication Date:
- Research Org.:
- US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1888868
- Alternate Identifier(s):
- OSTI ID: 1982663
- 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: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; galaxies: active; galaxies: interactions; quasars: absorption lines
Citation Formats
Dutta, Rajeshwari, and Srianand, Raghunathan. H i 21-cm absorption in radio-loud AGN with double-peaked [O iii ] emission. United Kingdom: N. p., 2022.
Web. doi:10.1093/mnras/stac2483.
Dutta, Rajeshwari, & Srianand, Raghunathan. H i 21-cm absorption in radio-loud AGN with double-peaked [O iii ] emission. United Kingdom. https://doi.org/10.1093/mnras/stac2483
Dutta, Rajeshwari, and Srianand, Raghunathan. Sat .
"H i 21-cm absorption in radio-loud AGN with double-peaked [O iii ] emission". United Kingdom. https://doi.org/10.1093/mnras/stac2483.
@article{osti_1888868,
title = {H i 21-cm absorption in radio-loud AGN with double-peaked [O iii ] emission},
author = {Dutta, Rajeshwari and Srianand, Raghunathan},
abstractNote = {Different physical processes in galaxy evolution, such as galaxy mergers that lead to coalescence of dual Active Galactic Nuclei (AGN) and outflows emanating from the narrow line region, can leave their imprint on the optical spectra of AGN in the form of double-peaked narrow emission lines. To investigate the neutral gas in the centres of such AGN, we have conducted a pilot survey of H I 21-cm absorption, using the upgraded Giant Metrewave Radio Telescope (uGMRT), in radio-loud AGN whose optical spectra show double-peaked [O III] emission lines at z ≤ 0.4 (median z ≈ 0.14). Among the eight sources for which we could obtain clean spectra, we detect H I 21-cm absorption in three sources (detection rate of $38^{+36}_{-20}$ per cent) and find tentative indication of absorption in two other sources. Here, the detection rate of H I 21-cm absorption is tentatively higher for the systems that show signatures of interaction or tidal disturbance (≳ 50 per cent) in the ground-based optical images than that for the systems that appear single and undisturbed (≈25 per cent). This is consistent with the high incidence of H I 21-cm absorption observed in z ≤ 0.2 galaxy mergers. Higher spatial resolution spectroscopy is required to confirm the origin of the H I absorbing gas, i.e. either gas infalling on to the radio-loud AGN, outflowing gas ejected by the AGN, or gas in rotation on the galactic-scale or circumnuclear discs.},
doi = {10.1093/mnras/stac2483},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 516,
place = {United Kingdom},
year = {Sat Sep 03 00:00:00 EDT 2022},
month = {Sat Sep 03 00:00:00 EDT 2022}
}
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