Aditya, J. N. H. S. ; Kanekar, Nissim ; Prochaska, J. Xavier ; Day, Brandon ; Lynam, Paul ; Cruz, Jocelyn (2016) Giant Metrewave Radio Telescope detection of associated H i 21-cm absorption atz = 1.2230 towards TXS 1954+513 Monthly Notices of the Royal Astronomical Society, 465 (4). pp. 5011-5015. ISSN 0035-8711
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Official URL: http://doi.org/10.1093/mnras/stw3105
Related URL: http://dx.doi.org/10.1093/mnras/stw3105
Abstract
We have used the 610-MHz receivers of the Giant Metrewave Radio Telescope (GMRT) to detect associated H I 21-cm absorption from the z = 1.2230 blazar TXS 1954+513. The GMRT H I 21-cm absorption is likely to arise against either the milliarcsecond-scale core or the one-sided milliarcsecond-scale radio jet, and is blueshifted by ≈328 km s-11 from the blazar redshift. This is consistent with a scenario in which the H I cloud giving rise to the absorption is being driven outwards by the radio jet. The integrated H I 21-cm optical depth is (0.716 ± 0.037) km s-1, implying a high H I column density, NHI=(1.305±0.067)×(Ts/100K)×1020 cm-2, for an assumed H I spin temperature of 100 K. We use Nickel Telescope photometry of TXS 1954+513 to infer a high rest-frame 1216 Å luminosity of (4.1 ± 1.2) × 1023 W Hz-1. The z = 1.2230 absorber towards TXS 1954+513 is only the fifth case of a detection of associated H I 21-cm absorption at z > 1, and is also the first case of such a detection towards an active galactic nucleus (AGN) with a rest-frame ultraviolet (UV) luminosity ≫1023 W Hz-1 , demonstrating that neutral hydrogen can survive in AGN environments in the presence of high UV luminosities.
Item Type: | Article |
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Source: | Copyright of this article belongs to Oxford University Press. |
Keywords: | Galaxies: Active; Galaxies: High-Redshift; Quasars: Absorption Lines; Radio Lines: Galaxies. |
ID Code: | 118070 |
Deposited On: | 12 May 2021 11:57 |
Last Modified: | 12 May 2021 11:57 |
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