Kinematics and Star Formation of High-Redshift Hot Dust-Obscured Quasars as Seen by ALMA

Abstract

Hot, dust-obscured galaxies (Hot DOGs) are a population of hyper-luminous obscured quasars identified by WISE. We present ALMA observations of the [CII] fine-structure line and underlying dust continuum emission in a sample of seven of the most extremely luminous (EL; L${}_{\mathrm{bol}}$ $\ge$ 10${}^{14}$ L${}_{\odot }$) Hot DOGs, at redshifts z ~ 3.0-4.6. The [CII] line is robustly detected in four objects, tentatively in one, and likely red-shifted out of the spectral window in the remaining two based on additional data. On average, [CII] is red-shifted by ~ 780 km/s from rest-frame ultraviolet emission lines. EL Hot DOGs exhibit consistently very high ionized gas surface densities, with ${\Sigma }_{[\mathrm{CII}]}$ ~ 1-2 x 10${}^9$ L${}_{\odot }$ kpc${}^{-2}$; as high as the most extreme cases seen in other high-redshift quasars. As a population, EL Hot DOG hosts seem to be roughly centered on the main-sequence of star forming galaxies, but the uncertainties are substantial and individual sources can fall above and below. The average, intrinsic [CII] and dust continuum sizes (FWHMs) are ~ 2.1 kpc and ~ 1.6 kpc, respectively, with a very narrow range of line-to-continuum size ratios, 1.61 $\pm$ 0.10, suggesting they could be linearly proportional. The [CII] velocity fields of EL Hot DOGs are diverse: from barely rotating structures, to resolved hosts with ordered, circular motions, to complex, disturbed systems that are likely the result of ongoing mergers. In contrast, all sources display large line-velocity dispersions, FWHM $\gtrsim$ 500 km/s, which on average are larger than optically and IR-selected quasars at similar or higher redshifts. We argue that one possible hypothesis for the lack of a common velocity structure, the systematically large dispersion of the ionized gas, and the presence of nearby companion galaxies may be that, rather than a single event, the EL Hot DOG phase could be recurrent.

31 pages, 13 figures. Accepted for publication in A&A

References in corpus (58)

• Cosmic Star Formation History
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• The Herschel view of the dominant mode of galaxy growth from z=4 to the present day
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Black Holes on FIRE: Stellar Feedback Limits Early Feeding of Galactic Nuclei
• A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang
• The ALPINE-ALMA [CII] Survey: data processing, catalogs, and statistical source properties
• A Compendium of Far-Infrared Line and Continuum Emission for 227 Galaxies Observed by the Infrared Space Observatory
• The First Hyper-Luminous Infrared Galaxy Discovered by WISE
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• 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
• Kiloparsec-scale ALMA Imaging of [CII] and Dust Continuum Emission of 27 Quasar Host Galaxies at z~6
• The ALPINE-ALMA [CII] Survey: Size of Individual Star-Forming Galaxies at z=4-6 and their Extended Halo Structure
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
• The X-Ray to Mid-Infrared Relation of AGN at High Luminosity
• ALMA Observations Show Major Mergers Among the Host Galaxies of Fast-growing, High-redshift Supermassive Black Holes
• NuSTAR and XMM-Newton Observations of Luminous, Heavily Obscured, WISE-Selected Quasars at z ~ 2
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular gas reservoirs in high-redshift galaxies
• The compact, ~1 kpc host galaxy of a quasar at z=7.1
• ALMA Imaging of HCN, CS and dust in Arp 220 and NGC 6240
• The Spatially Resolved [CII] Cooling Line Deficit in Galaxies
• ALMA Observation of 158 micron [CII] Line and Dust Continuum of a z=7 Normally Star-forming Galaxy in the Epoch of Reionization
• Mid-Infrared Properties of Luminous Infrared Galaxies II: Probing the Dust and Gas Physics of the GOALS Sample
• A wide dispersion in star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• Large turbulent reservoirs of cold molecular gas around high-redshift starburst galaxies
• Strong C+ emission in galaxies at z~1-2: Evidence for cold flow accretion powered star formation in the early Universe
• The WISSH QSOs project IX. Cold gas content and environment of luminous QSOs at z~2.4-4.7
• Submillimetre observations of WISE-selected high-redshift, luminous, dusty galaxies
• Bright [CII] 158$\mu$m emission in a quasar host galaxy at $z=6.54$
• Powerful H2 Line Cooling in Stephan's Quintet II. Group-wide Gas and Shock Modeling of the Warm H2 and a Comparison with [CII]157.7um Emission and Kinematics
• A 33 GHz Survey of Local Major Mergers: Estimating the Sizes of the Energetically Dominant Regions from High Resolution Measurements of the Radio Continuum
• Exceptional AGN-driven turbulence inhibits star formation in the 3C 326N radio-galaxy
• The ALPINE-ALMA [CII] survey: Small Lya-[CII] velocity offsets in main-sequence galaxies at 4.4 < z < 6
• [OIII] Emission Line Properties in a New Sample of Heavily Reddened Quasars at $z>2$
• Interferometric Follow-Up of WISE Hyper-Luminous Hot, Dust-Obscured Galaxies
• Fast Outflows in Hot Dust-Obscured Galaxies with Keck/NIRES
• Massive Star Cluster Formation and Destruction in Luminous Infrared Galaxies in GOALS
• Spectral Classification and Ionized Gas Outflows in $z\sim 2$ WISE-Selected Hot Dust-Obscured Galaxies
• Close companions to two high-redshift quasars
• ALMA Observations of Quasar Host Galaxies at $z\simeq 4.8$
• The Dust-to-Gas Ratio and the Role of Radiation Pressure in Luminous, Obscured Quasars
• Overdensities of SMGs around WISE-selected, ultra-luminous, high-redshift AGN
• The ISM Properties and Gas Kinematics of a Redshift 3 Massive Dusty Star-forming Galaxy
• Resolving the Interstellar Medium in Ultraluminous Infrared QSO Hosts with ALMA
• The SCUBA-2 850 $\mu m$ follow-up of WISE-selected, luminous dust-obscured quasars
• The composite nature of Dust-Obscured Galaxies (DOGs) at z~2-3 in the COSMOS field: I. A Far-Infrared View
• The Dynamics and Distribution of Angular Momentum in HiZELS Star-Forming Galaxies at z = 0.8 - 3.3
• The Hunt for Red Quasars: Luminous Obscured Black Hole Growth Unveiled in the Stripe 82 X-ray Survey
• Cosmological simulations of quasar fueling to sub-parsec scales using Lagrangian hyper-refinement
• Cold Molecular Gas and Free-Free Emission from Hot, Dust-Obscured Galaxies at $z$~3
• The Close AGN Reference Survey (CARS). Discovery of a global [CII] 158 $\mu$m line excess in AGN HE1353-1917
• The composite nature of Dust-Obscured Galaxies (DOGs) at z~2-3 in the COSMOS field: II. The AGN fraction

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• A dusty compact object bridging galaxies and quasars at cosmic dawn
• Radio and Far-IR Emission Associated with a Massive Star-forming Galaxy Candidate at z$\simeq$6.8: A Radio-Loud AGN in the Reionization Era?
• Imaging Polarization of the Blue-Excess Hot Dust-Obscured Galaxy WISE J011601.41-050504.0