Massive molecular gas companions uncovered by VLA CO(1-0) observations of the $z$ = 5.2 radio galaxy TN J0924$-$2201

Abstract

We present Karl G. Jansky Very Large Array (VLA) K-band (19 GHz) observations of the redshifted CO(1-0) line emission toward the radio galaxy TN J0924$-$2201 at $z=5.2$, which is one of the most distant CO-detected radio galaxies. With the angular resolution of $\sim 2^{\prime \prime }$, the CO(1-0) line emission is resolved into three clumps, within $\pm 500$ km\,s${}^{-1}$ relative to its redshift, where is determined by Ly$\alpha$. We find that they locate off-center and 12-33 kpc away from the center of the host galaxy, which has counterparts in $HST$ $i$-band, $Spitzer$/IRAC and ALMA Band-6 (230 GHz; 1.3 mm). With the ALMA detection, we estimate $L_{\mathrm{IR}}$ and SFR of the host galaxy to be $(9.3\pm 1.7)\times 10^{11}{L}_{\odot }$ and $110\pm 20$ $M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$, respectively. We also derive the $3\sigma$ upper limit of $M_{{\mathrm{H}}_2}<1.3\times 10^{10}$ $M_{\odot }$ at the host galaxy. The detected CO(1-0) line luminosities of three clumps, $L_{\mathrm{CO}(1-0)}^{\prime }$ = (3.2-4.7)$\times 10^{10}$ $\mathrm{K}\mathrm{km}{\mathrm{s}}^{-1}\mathrm{p}{\mathrm{c}}^2$, indicate the presence of three massive molecular gas reservoirs with $M_{{\mathrm{H}}_2}$ = (2.5-3.7)$\times 10^{10}$ $M_{\odot }$, by assuming the CO-to-H${}_2$ conversion factor ${\alpha }_{\mathrm{CO}}=0.8$ $M_{\odot }(\mathrm{K}\mathrm{km}{\mathrm{s}}^{-1}\mathrm{p}{\mathrm{c}}^2{)}^{-1}$, although the star formation rate (SFR) is not elevated because of the non-detection of ALMA 1.3 mm continuum (SFR $<$ 40 $M_{\odot }$ yr${}^{-1}$). From the host galaxy, the nearest molecular gas clump labeled as clump A, is apparently aligning with the radio jet axis, showing the radio-CO alignment. The possible origin of these three clumps around TN J0924$-$2201 can be interpreted as merger, jet-induced metal enrichment and outflow.

arXiv comment14 pages, 9 figures. Accepted for publication in ApJ

References in corpus (34)

• Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
• CASA, the Common Astronomy Software Applications for Radio Astronomy
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• ISM masses and the star formation law at Z = 1 to 6 // ALMA observations of dust continuum in 145 galaxies in the COSMOS survey field
• A survey of molecular gas in luminous sub-millimetre galaxies
• The Evolution of the Star-forming Interstellar Medium across Cosmic Time
• Distant Radio Galaxies and their Environments
• Tracing the molecular gas in distant submillimetre galaxies via CO(1-0) imaging with the EVLA
• Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0<z<4
• A Sample of 669 Ultra Steep Spectrum Radio Sources to Find High Redshift Radio Galaxies
• A Radio Galaxy at z=5.19
• CO(4-3) and dust emission in two powerful high-z radio galaxies, and CO lines at high redshifts
• The Spitzer High Redshift Radio Galaxy Survey
• Discovery of six Ly alpha emitters near a radio galaxy at z ~ 5.2
• Molecular gas at high redshift: jet-induced star formation?
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• ALMA observations of massive molecular gas filaments encasing radio bubbles in the Phoenix cluster
• Dust and star formation in distant radio galaxies
• Anisotropic Metal-enriched Outflows Driven by AGN in Clusters of Galaxies
• Clustering of Star-forming Galaxies Near a Radio Galaxy at z=5.2
• Detection of Two Massive CO Systems in 4C 41.17 at z = 3.8
• CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources
• ALMA twenty-six arcmin${}^2$ survey of GOODS-S at one-millimeter (ASAGAO): Near-infrared-dark faint ALMA sources
• Precession of the Super-Massive Black Hole in NGC 1275 (3C 84)?
• CO(1-0) & CO(5-4) observations of the most distant known radio galaxy at z=5.2
• The Lifetime of FRIIs in Groups and Clusters: Implications for Radio-Mode Feedback
• CO(1-0) detection of molecular gas in the massive Spiderweb Galaxy (z=2)
• Massive galaxies on the road to quenching: ALMA observations of powerful high redshift radio galaxies
• Detection of CO J=1-0 in the z=3.79 radio galaxy 4C60.07
• Impact of relativistic jets on the star formation rate: a turbulence-regulated framework
• The Mysterious Morphology of MRC0943-242 as Revealed by ALMA and MUSE
• Quenching by gas compression and consumption: A case study of a massive radio galaxy at z = 2.57
• ALMA and MUSE observations reveal a quiescent multi-phase circumgalactic medium around the z~3.6 radio galaxy 4C 19.71
• A sensitive search for CO J=1-0 emission in 4C 41.17: high-excitation molecular gas at z=3.8

Cited by in corpus (2)

• CO survey of high-z radio galaxies, revisited with ALMA: Jet-cloud Alignments and Synchrotron Brightening by Molecular Gas in the Circumgalactic Environment
• Gas-Poor Hosts and Gas-Rich Companions of $z\approx$3.5 Radio Active Galactic Nuclei: ALMA Insights into Jet Triggering and Feedback