Far-infrared and Molecular CO Emission From the Host Galaxies of Faint Quasars at z~6

Abstract

We present new millimeter and radio observations of nine z~6 quasars discovered in deep optical and near-infrared surveys. We observed the 250 GHz continuum in eight of the nine objects and detected three of them. New 1.4 GHz radio continuum data have been obtained for four sources, and one has been detected. We searched for molecular CO (6-5) line emission in the three 250 GHz detections and detected two of them. We study the FIR and radio emission and quasar-host galaxy evolution with a sample of 18 z~6 quasars that are faint at UV/optical wavelengths (rest-frame 1450A magnitudes of m_1450\ge20.2). The average FIR-to-AGN UV luminosity ratio of this faint quasar sample is about two times higher than that of the bright quasars at z~6 (m_1450<20.2). A fit to the average FIR and AGN bolometric luminosities of both the UV/optically faint and bright z~6 quasars, and the average luminosities of samples of submillimeter /millimeter-observed quasars at z~2 to 5, yields a relationship of L_{FIR} {L_{bol}}^{0.62}. Five of the 18 faint z~6 quasars have been detected at 250 GHz. These 250 GHz detections, as well as most of the millimeter-detected optically bright z~6 quasars, follow a shallower trend of L_{FIR} {L_{bol}}^{0.45} defined by the starburst-AGN systems in local and high-z universe. The millimeter continuum detections in the five objects and molecular CO detections in three of them reveal a few x10^8 M_sun of FIR-emitting warm dust and 10^10 M_sun of molecular gas in the quasar host galaxies. All these results argue for massive star formation in the quasar host galaxies, with estimated star formation rates of a few hundred M_sun yr^{-1}. Additionally, the higher FIR-to-AGN luminosity ratio found in these 250 GHz-detected faint quasars also suggests a higher ratio between star formation rate and supermassive black hole accretion rate than the UV/optically most luminous quasars at z~6.

23 pages, 4 figures, to be published in AJ

References in corpus (17)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• 350 Micron Dust Emission from High Redshift Quasars
• Spitzer Quasar and ULIRG Evolution Study (QUEST): II. The Spectral Energy Distributions of Palomar-Green Quasars
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• The Evolution of Dust in the Early Universe with Applications to the Galaxy SDSS J1148+5251
• A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang
• Gemini Near-infrared Spectroscopy of Luminous z~6 Quasars: Chemical Abundances, Black Hole Masses, and MgII Absorption
• Black hole masses and enrichment of z ~ 6 SDSS quasars
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• CO(1-0) in z >/~ 4 Quasar Host Galaxies: No Evidence for Extended Molecular Gas Reservoirs
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Six more quasars at redshift 6 discovered by the Canada-France High-z Quasar Survey
• Millimeter and Radio Observations of z~6 Quasars
• The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey
• The Radio/Optical Catalog of the SSA13 Field
• The Discovery of Three New z>5 Quasars in the AGN and Galaxy Evolution Survey
• SHARC-II 350 micron Observations of Thermal Emission from Warm Dust in z>=5 Quasars

Cited by in corpus (93)

• Star Formation and Gas Kinematics of Quasar Host Galaxies at z~6: New insights from ALMA
• The MassiveBlack-II Simulation: The Evolution of Halos and Galaxies to z~0
• The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• Galaxy growth in a massive halo in the first billion years of cosmic history
• Bright [CII] and dust emission in three z>6.6 quasar host galaxies observed by ALMA
• Star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• Spectral Energy Distributions of QSOs at z>5: common AGN-heated dust and occasionally strong star-formation
• Blowing cold flows away: the impact of early AGN activity on the formation of a brightest cluster galaxy progenitor
• Redshift 6.4 host galaxies of 10^8 solar mass black holes: low star formation rate and dynamical mass
• The Coevolution of Supermassive Black Holes and Massive Galaxies at High Redshift
• The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• Dust emission in an accretion-rate-limited sample of z>6 quasars
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) VIII. A less biased view of the early co-evolution of black holes and host galaxies
• COPSS II: The Molecular Gas Content of Ten Million Cubic Megaparsecs at $z\sim 3$
• A wide dispersion in star formation rate and dynamical mass of 10^8 solar mass black hole host galaxies at redshift 6
• Molecular gas in three z~7 quasar host galaxies
• The dust-to-stellar mass ratio as a valuable tool to probe the evolution of local and distant star forming galaxies
• The anatomy of an extreme starburst within 1.3Gyr of the Big Bang revealed by ALMA
• Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) III. Star formation properties of the host galaxies at $z\gtrsim 6$ studied with ALMA
• High-redshift quasars and their host galaxies I: kinematical and dynamical properties and their tracers
• Spatially Resolved Interstellar Medium and Highly-Excited Dense Molecular Gas in the Most Luminous Quasar at z=6.327
• GA-NIFS: Black hole and host galaxy properties of two z$\simeq$6.8 quasars from the NIRSpec IFU
• Gas dynamics of a luminous $z$ = 6.13 quasar ULAS J1319$+$0950 revealed by ALMA high resolution observations
• Infrared spectral energy distribution decomposition of WISE-selected, hyperluminous hot dust-obscured galaxies
• The dust content of QSO hosts at high redshift
• Galaxy Gas Fractions at High-Redshift: The Tension between Observations and Cosmological Simulations
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• The Evolution of Chemical Abundance in Quasar Broad Line Region
• Complete infrared spectral energy distributions of mm detected quasars at z>5
• Far-Infrared Properties of the Bright, Gravitationally Lensed Quasar J0439+1634 at z=6.5
• Dynamical Characterization of Galaxies at z~4-6 via Tilted Ring Fitting to ALMA [CII] Observations
• The Contribution of Host Galaxies to the Infrared Energy Output of $z\gtrsim 5.0$ QUASARS
• Molecular gas in z~6 quasar host galaxies
• The molecular gas content in obscured AGN at z > 1
• What produces the far-infrared/submm emission in the most luminous QSOs?
• An X-ray and Multiwavelength Survey of Highly Radio-Loud Quasars at z > 4: Jet-Linked Emission in the Brightest Radio Beacons of the Early Universe
• Constraining the quasar radio-loud fraction at $z\sim 6$ with deep radio observations
• First Results from COPSS: The CO Power Spectrum Survey
• The Formation of Galaxies Hosting z~6 Quasars
• Impact of X-rays on CO emission from high-z galaxies
• Star Formation and ISM Properties in Host Galaxies of Three Far-infrared Luminous Quasars at $z\sim 6$
• Physical properties of the first quasars
• Probing the full CO spectral line energy distribution (SLED) in the nuclear region of a quasar-starburst system at $z=6.003$
• The Pan-STARRS1 $\mathbf{z}>5.6$ Quasar Survey: III. The $\mathbf{z}\approx 6$ Quasar Luminosity Function
• Interferometric Follow-Up of WISE Hyper-Luminous Hot, Dust-Obscured Galaxies
• A Population of Dust-Rich Quasars at z ~ 1.5
• Constraints on high-J CO emission lines in $z\sim 6$ quasars
• HST narrow-band search for extended Ly-alpha emission around two z>6 quasars
• HerMES: Spectral Energy Distributions of Submillimeter Galaxies at z >4
• Co-evolution of Extreme Star Formation and Quasar: hints from {\it Herschel} and the Sloan Digital Sky Survey
• Star formation and black hole growth at z=4.8
• Limits to Rest-Frame Ultraviolet Emission From Far-Infrared-Luminous z~6 Quasar Hosts
• The spectral energy distribution of the redshift 7.1 quasar ULAS J1120+0641
• The Canada-France High-z Quasar Survey: 1.2mm Observations
• Galaxy Formation Through Filamentary Accretion at z=6.1
• The interstellar medium distribution, gas kinematics, and system dynamics of the far-infrared luminous quasar SDSS J2310+1855 at $z=6.0$
• The Tully-Fisher Relation of COLD GASS Galaxies
• Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1<z<4
• A comprehensive view of the interstellar medium in a quasar host galaxy at z~6.4
• The host galaxies of z=7 quasars: predictions from the BlueTides simulation
• Extreme star formation in the host galaxies of the fastest growing super-massive black holes at z=4.8
• Black versus Dark: Rapid Growth of Supermassive Black Holes in Dark Matter Halos at z ~ 6
• CO emission in optically obscured (type-2) quasars at redshifts z=0.1-0.4
• Black hole -- galaxy scaling relations in FIRE: the importance of black hole location and mergers
• Observing the host galaxies of high-redshift quasars with JWST: predictions from the BlueTides simulation
• The SCUBA-2 850 $\mu m$ follow-up of WISE-selected, luminous dust-obscured quasars
• Molecular gas in type 2 quasars at z~0.2-0.3
• WISE detections of known QSOs at redshifts greater than six
• Resolving the interstellar medium in the nuclear region of two z=5.78 quasar host galaxies with ALMA
• A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs
• A tiny host galaxy for the first giant black hole: $z=7.5$ quasar in BlueTides
• HYPERION. Coevolution of supermassive black holes and galaxies at $z>6$ and the build-up of massive galaxies
• SCUBA2 High Redshift Bright Quasar Survey: Far-infrared Properties and Weak-line Features
• Near-infrared Extinction due to Cool Supernova Dust in Cassiopeia A
• CO Tully-Fisher Relation of Star-forming Galaxies at z=0.05-0.3
• Big Three Dragons: Molecular Gas in a Bright Lyman-Break Galaxy at $z=7.15$
• Unveiling the warm dense ISM in $z>6$ quasar host galaxies via water vapor emission
• The cold molecular gas in z$\gtrsim$6 quasar host galaxies
• Molecular gas and dust properties in $z>7$ quasar hosts
• Extreme Galaxies During Reionization: Testing ISM and Disk Models
• The molecular gas content of ULIRG type 2 quasars at z < 1
• Radio-loud fraction of z>6 quasars
• [CI], [CII] and CO emission lines as a probe for alpha variations at low and high redshifts
• Active Galactic Nuclei and their Role in Galaxy Evolution: The Infrared Perspective
• High Star Formation Rates of Low Eddington Ratio Quasars at $z\gtrsim 6$
• Faint AGN in z>~6 Lyman-break Galaxies Powered by Cold Accretion and Rapid Angular Momentum Transport
• ALMA Observations for CO Emission from Luminous Lyman-break Galaxies at $z=6.0293$-$6.2037$
• Ground-state 12CO emission and a resolved jet at 115 GHz (rest-frame) in the radio loud quasar 3C318
• A luminous molecular gas pair beyond redshift 7
• Where is Population II?
• Star Formation in Quasar Host Galaxies at Redshift 6: Millimeter Surveys and New Insights from ALMA