CO spectra of the ISM in the Host Galaxies of the Most Luminous WISE-Selected AGNs

Abstract

We present observations of mid-J J=4-3 or J=5-4 carbon monoxide (CO) emission lines and continuum emission from a sample of ten of the most luminous log(L/L_solar)~14 Hot Dust-Obscured Galaxies (Hot DOGs) discovered by the Wide-field Infrared Survey Explorer (WISE) with redshifts up to 4.6. We uncover broad spectral lines (FWHM~400 km/s) in these objects, suggesting a turbulent molecular interstellar medium (ISM) may be ubiquitous in Hot DOGs. A halo of molecular gas, extending out to a radius of 5 kpc is observed in W2305-0039, likely supplied by 940 km/s molecular outflows. W0831+0140 is plausibly the host of a merger between at least two galaxies, consistent with observations made using ionized gas. These CO(4-3) observations contrast with previous CO(1-0) studies of the same sources: the CO(4-3) to CO(1-0) luminosity ratios exceed 300 in each source, suggesting that the lowest excited states of CO are underluminous. These findings show that the molecular gas in Hot DOGs is consistently turbulent, plausibly a consequence of AGN feedback, triggered by galactic mergers.

19 pages (16 main text & 3 in Appendix), 9 figures, plus 3 in Appendix. MNRAS in press

References in corpus (26)

• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• Growing supermassive black holes in the late stages of galaxy mergers are heavily obscured
• The First Hyper-Luminous Infrared Galaxy Discovered by WISE
• Half of the Most Luminous Quasars May Be Obscured: Investigating the Nature of WISE-Selected Hot, Dust-Obscured Galaxies
• The Most Luminous Galaxies Discovered by WISE
• Submillimeter Follow-up of WISE-Selected Hyperluminous Galaxies
• The ALPINE-ALMA [CII] Survey: Size of Individual Star-Forming Galaxies at z=4-6 and their Extended Halo Structure
• The Kinematics of z ~ 6 Quasar Host Galaxies
• The ALMA Spectroscopic Survey in the HUDF: CO Excitation and Atomic Carbon in Star-Forming Galaxies at $z=1-3$
• Mergers Do Trigger AGNs out to z $\sim$ 0.6
• Molecules in galaxies
• Submillimetre observations of WISE-selected high-redshift, luminous, dusty galaxies
• High molecular gas content and star formation rates in local galaxies that host quasars, outflows and jets
• Expectations of the size evolution of massive galaxies at $3\le z\le 6$ from the TNG50 simulation: the CEERS/JWST view
• Fast Outflows in Hot Dust-Obscured Galaxies with Keck/NIRES
• Spectral Classification and Ionized Gas Outflows in $z\sim 2$ WISE-Selected Hot Dust-Obscured Galaxies
• An extended [CII] halo around a massive star-forming galaxy at z = 5.3
• The Dust-to-Gas Ratio and the Role of Radiation Pressure in Luminous, Obscured Quasars
• Detection of companion galaxies around hot dust-obscured hyper-luminous galaxy W0410-0913
• Imaging Polarization of the Blue-Excess Hot Dust-Obscured Galaxy WISE J011601.41-050504.0
• A Census of WISE-selected Dual and Offset AGN Across the Sky: New Constraints on Merger-Driven Triggering of Obscured AGN
• The composite nature of Dust-Obscured Galaxies (DOGs) at z~2-3 in the COSMOS field: I. A Far-Infrared View
• Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at $z$~3
• An Overdensity of Lyman Break Galaxies Around the Hot Dust-Obscured Galaxy WISE J224607.56$-$052634.9
• An overdensity of red galaxies around the hyperluminous dust-obscured quasar W1835$+$4355 at $z=2.3$
• Alma Reveals A Gas-rich, Maximum-starburst In The Hyperluminous, Dust-obscured Quasar W0533-3401 AT $z\sim 2.9$

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