Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at $z=1.2230$ towards TXS1954+513

Abstract

We have used the 610 MHz receivers of the Giant Metrewave Radio Telescope (GMRT) to detect associated HI 21cm absorption from the $z=1.2230$ blazar TXS1954+513. The GMRT HI 21cm absorption is likely to arise against either the milli-arcsecond-scale core or the one-sided milli-arcsecond-scale radio jet, and is blueshifted by $\approx 328$ km s${}^{-1}$ from the blazar redshift. This is consistent with a scenario in which the HI cloud giving rise to the absorption is being driven outward by the radio jet. The integrated HI 21cm optical depth is $(0.716\pm 0.037)$ km s${}^{-1}$, implying a high HI column density, $N_{\mathrm{HI}}=(1.305\pm 0.067)\times ({\mathrm{T}}_{\mathrm{s}}/100\mathrm{K})\times 10^{20}$ cm${}^{-2}$, for an assumed HI spin temperature of 100 K. We use Nickel Telescope photometry of TXS1954+513 to infer a high rest-frame 1216 Å luminosity of $(4.1\pm 1.2)\times 10^{23}$ W Hz${}^{-1}$. The $z=1.2230$ absorber towards TXS1954+513 is only the fifth case of a detection of associated HI 21cm 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 luminosity $\gg 10^{23}$ W Hz${}^{-1}$, demonstrating that neutral hydrogen can survive in AGN environments in the presence of high ultraviolet luminosities.

arXiv comment5 pages, 2 figures; accepted for publication in MNRAS

References in corpus (22)

• The USNO-B Catalog
• Roma-BZCAT: A multifrequency catalogue of Blazars
• UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions
• Fast neutral outflows in powerful radio galaxies: a major source of feedback in massive galaxies
• Driving Outflows with Relativistic Jets and the Dependence of AGN Feedback Efficiency on ISM Inhomogeneity
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• Radio Jets Clearing the Way Through a Galaxy: Watching Feedback in Action
• Relativistic Jet Feedback in Evolving Galaxies
• Observations of HI Absorbing Gas in Compact Radio Sources at Cosmological Redshifts
• Probing radio source environments via HI and OH absorption
• The location of the broad HI absorption in 3C305: clear evidence for a jet-accelerated neutral outflow
• The HI absorption "Zoo"
• A survey for redshifted molecular and atomic absorption lines - II. Associated HI, OH and millimetre lines in the z >~ 3 Parkes quarter-Jansky flat-spectrum sample
• Detection of $1.6\times 10^{10}$ M${}_{\odot }$ of molecular gas in the host galaxy of the $z=5.77$ SDSS quasar J0927+2001
• Is cold gas fuelling the radio galaxy NGC 315?
• Complete ionisation of the neutral gas: why there are so few detections of 21-cm hydrogen in high redshift radio galaxies and quasars
• A Giant Metrewave Radio Telescope search for associated HI 21cm absorption in high-redshift flat-spectrum sources
• A survey for the missing hydrogen in high redshift radio sources
• Signatures of restarted activity in core-dominated, triple radio sources selected from the FIRST survey
• New searches for HI 21-cm in damped Lyman-alpha absorption systems
• A Multi-Epoch VLBI Survey of the Kinematics of CJF Sources; Part I: Model-Fit Parameters and Maps
• Imaging HI Absorption toward Symmetric Radio Galaxies - Evidence for a Circumnuclear Torus

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• The HI absorption zoo: JVLA extension to $z\sim 0.4$
• PKSB1740-517: An ALMA view of the cold gas feeding a distant interacting young radio galaxy
• Atomic and Molecular Absorption in Redshifted Radio Sources
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• The mid-infrared properties and gas content of active galaxies over large look-back times
• FLASH Pilot Survey: Detections of associated 21 cm HI absorption in GAMA galaxies at 0.42 < z <1.00
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• Further Observational Evidence for a Critical Ionising Luminosity in Active Galaxies
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• Redshift evolution of the HI detection rate in radio-loud active galactic nuclei
• Intervening or associated? Machine learning classification of redshifted H I 21-cm absorption
• Disc galaxy resolved in HI absorption against the radio lobe of 3C 433: Case study for future surveys
• HI Absorption in Low-power Radio AGNs Detected by FAST
• Ultra-violet photo-ionisation in far-infrared selected sources