The HI absorption zoo: JVLA extension to $z\sim 0.4$

Abstract

We present an HI 21cm absorption study of a sample of 26 radio-loud active galactic nuclei (AGN) at $0.25<z<0.4$ carried out with the Karl G. Jansky Very Large Array. Our aim was to study the rate of incidence of HI in various classes of radio AGN, the morphology and kinematics of the HI, and the nature of the interaction between the HI and the radio source. Our sample consists of 14 extended sources and 12 compact sources in the radio-power range 10${}^{25.7}$W/Hz$-10^{26.5}$W/Hz. We detect HI in 5 sources with a detection rate of $\sim$19%, similar to the detection rate at lower redshifts. The rest-frame UV luminosities of most of the sources in the sample, including all the detections, are below the proposed threshold above which the HI is supposed to have been ionised. The optical emission-line spectra show that despite their high radio powers, one-third of the sample, including two detections, are low-ionisation sources. The radio continuum emission from the HI detections is unresolved at kpc scales, but is extended on parsec scales. The detections have complex HI 21cm absorption profiles with FWZI ranging from 60 km/s to 700 km/s and exhibit remarkably high HI column densities in the range 10${}^{21}$ cm${}^{-2}$ to 10${}^{22}$ cm${}^{-2}$ for T${}_{\mathrm{spin}}=$100 K and unit covering factor. A modelling of the HI 21cm absorption profiles suggests that in 2 sources the gas is disturbed, and in 3 cases, including the one with disturbed HI, the majority of the absorption is consistent with arising from an HI disc. Though we detect no fast HI outflows, the optical emission lines in the HI detections show the presence of highly disturbed gas in the nuclear region. Since some of our detections are low-ionisation AGN, this disturbance may be caused by the radio jets. Overall, our findings point towards a continuation of the low-$z$ trends in the incidence of HI in radio AGN up to $z\sim 0.4$.

arXiv comment23 pages, 10 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (75)

• emcee: The MCMC Hammer
• Planck 2013 results. XVI. Cosmological parameters
• The Optical and Near-Infrared Properties of Galaxies: I. Luminosity and Stellar Mass Functions
• The Baryonic Tully-Fisher Relation
• On the fundamental dichotomy in the local radio-AGN population: accretion, evolution, and host galaxy properties
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• The Thirteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey MApping Nearby Galaxies at Apache Point Observatory
• On the Estimation of Confidence Intervals for Binomial Population Proportions in Astronomy: The Simplicity and Superiority of the Bayesian Approach
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• Roma-BZCAT: A multifrequency catalogue of Blazars
• The VLBA Calibrator Survey - VCS1
• Near-infrared template spectra of normal galaxies: k-corrections, galaxy models and stellar populations
• Relativistic jet feedback III: feedback on gas disks
• Analytical approximations of K-corrections in optical and near-infrared bands
• Relativistic jet feedback in high-redshift galaxies I: Dynamics
• Radio Jets Clearing the Way Through a Galaxy: Watching Feedback in Action
• Relativistic Jet Feedback in Evolving Galaxies
• SDSSJ150634.27+013331.6: the second compact elliptical galaxy in the NGC5846 group
• A universal ultraviolet-optical colour-colour-magnitude relation of galaxies
• Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies
• The ALMA Spectroscopic Survey in the HUDF: CO luminosity functions and the molecular gas content of galaxies through cosmic history
• A Cold, Massive, Rotating Disk Galaxy 1.5 Billion Years after the Big Bang
• Observations of HI Absorbing Gas in Compact Radio Sources at Cosmological Redshifts
• The WISE Blazar-Like Radio-Loud Sources: An All-Sky Catalog Of Candidate Gamma-Ray Blazars
• Probing radio source environments via HI and OH absorption
• Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES Detection of a Starbursting Galaxy at z=0.376
• HI absorption in radio galaxies: effect of orientation or interstellar medium?
• The jet-ISM interactions in IC 5063
• Relativistic jet feedback II: Relationship to gigahertz peak spectrum and compact steep spectrum radio galaxies
• The spin temperature of high-redshift damped Lyman-$\alpha$ systems
• The Presence and Distribution of HI Absorbing Gas in Sub-galactic Sized Radio Sources
• The HI absorption "Zoo"
• The interstellar and circumnuclear medium of active nuclei traced by HI 21-cm absorption
• WSRT Ultra-Deep Neutral Hydrogen Imaging of Galaxy Clusters at z=0.2, a Pilot Survey of Abell 963 and Abell 2192
• HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
• HI 21-centimetre emission from an ensemble of galaxies at an average redshift of one
• Kinematics and physical conditions of HI in nearby radio sources. The last survey of the old Westerbork Synthesis Radio Telescope
• The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the molecular gas in CO-selected galaxies
• A Pilot Survey of HI in Field Galaxies at Redshift z~0.2
• Centaurus A: morphology and kinematics of the atomic hydrogen
• 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
• A survey for redshifted molecular and atomic absorption lines I
• A search for HI 21cm absorption in strong MgII absorbers in the redshift desert
• Atomic hydrogen in star-forming galaxies at intermediate redshifts
• The wide-field VLBA calibrator survey -- WFCS
• A complete sample of 21-cm absorbers at z~1.3: Giant Metrewave Radio Telescope Survey Using MgII Systems
• Is cold gas fuelling the radio galaxy NGC 315?
• CHILES VI: HI and H$\alpha$ Observations for z < 0.1 Galaxies; Probing HI Spin Alignment with Filaments in the Cosmic Web
• Molecular Emission from a Galaxy Associated with a z~2.2 Damped Lyman-alpha Absorber
• Giant Metrewave Radio Telescope Detection of HI 21 cm Emission from Star-forming Galaxies at $z\approx 1.3$
• Cold gas in massive early-type galaxies: The case of NGC 1167
• A Giant Metrewave Radio Telescope search for associated H{\sc i} 21\,cm absorption in GHz-peaked-spectrum sources
• Probing multi-phase outflows and AGN feedback in compact radio galaxies: the case of PKSB 1934-63
• Radio Follow-up on all Unassociated Gamma-ray Sources from the Third Fermi Large Area Telescope Source Catalog
• A Giant Metrewave Radio Telescope search for associated HI 21cm absorption in high-redshift flat-spectrum sources
• Redshifted HI and OH absorption in radio galaxies and quasars
• FLASH Early Science -- Discovery of an intervening HI 21-cm absorber from an ASKAP survey of the GAMA 23 field
• An HI absorbing circumnuclear disk in Cygnus A
• Massive, Absorption-selected Galaxies at Intermediate Redshifts
• A Giant Metrewave Radio Telescope survey for associated HI 21-cm absorption in the Caltech-Jodrell Flat-spectrum sample
• Correlation between X-ray and radio absorption in compact radio galaxies
• A Search for Intrinsic HI 21 cm and OH 18 cm Absorption Toward Compact Radio Sources
• CHILES: HI morphology and galaxy environment at z=0.12 and z=0.17
• Feedback from low-luminosity radio galaxies: B2 0258+35
• Prevalence of neutral gas in centres of merging galaxies
• BUDHIES IV: Deep 21-cm neutral Hydrogen, optical and UV imaging data of Abell 963 and Abell 2192 at z $\simeq$ 0.2
• Mapping the neutral atomic hydrogen gas outflow in the restarted radio galaxy 3C 236
• The parsec-scale HI outflows in powerful radio galaxies
• Ionisation of the atomic gas in redshifted radio sources
• Giant Metrewave Radio Telescope detection of associated HI 21cm absorption at $z=1.2230$ towards TXS1954+513
• Invisible Active Galactic Nuclei. II Radio Morphologies & Five New HI 21 cm Absorption Line Detections
• High Molecular Gas Masses in Absorption-selected Galaxies at $z\approx 2$
• Atomic and Molecular Absorption in Redshifted Radio Sources
• "Invisible AGN" I: Sample Selection and Optical/Near-IR Spectral Energy Distributions
• Young radio jets breaking free: molecular and HI outflows in their centers

Cited by in corpus (9)

• The First Large Absorption Survey in HI (FLASH): I. Science Goals and Survey Design
• Better Together: The Complex Interplay Between Radiative Cooling and Magnetic Draping
• HI absorption at z~0.7 against the lobe of the powerful radio galaxy PKS 0409-75
• FLASH Pilot Survey: Detections of associated 21 cm HI absorption in GAMA galaxies at 0.42 < z <1.00
• Redshift evolution of the HI detection rate in radio-loud active galactic nuclei
• The FAST HI 21-cm absorption blind survey. II. -- Statistic Exploration for Associated and Intervening systems
• HI Absorption in Low-power Radio AGNs Detected by FAST
• Turbulent circumnuclear disc and cold gas outflow in the newborn radio source 4C 31.04
• HI 21-cm absorption in radio-loud AGN with double-peaked [OIII] emission