SCUBA2 High Redshift Bright Quasar Survey: Far-infrared Properties and Weak-line Features

Abstract

We present a submillimetre continuum survey ('SCUBA2 High rEdshift bRight quasaR surveY', hereafter SHERRY) of 54 high redshift quasars at $5.6<z<6.9$ with quasar bolometric luminosities in a range of (0.2$-$$5)\times 10^{14}{L}_{\odot }$, using the Submillimetre Common-User Bolometer Array-2 (SCUBA2) on the James Clerk Maxwell Telescope. About 30% (16/54) of the sources are detected with a typical 850$\mu$m rms sensitivity of 1.2 $\mathrm{mJy}\mathrm{bea}{\mathrm{m}}^{-1}$ ($S{}_{\nu ,850\mu \mathrm{m}}=4$-5 mJy, at $>3.5\sigma$). The new SHERRY detections indicate far-infrared (FIR) luminosities of $3.5\times 10^{12}$ to $1.4\times 10^{13}$ $L_{\odot }$, implying extreme star formation rates of 90 to 1060 $M_{\odot }$ yr${}^{-1}$ in the quasar host galaxies. Compared with $z=$ 2$-$5 samples, the FIR luminous quasars ($L_{\mathrm{FIR}}>10^{13}{L}_{\odot }$) are more rare at $z\sim 6$. The optical/near-infrared (NIR) spectra of these objects show 11% (6/54) of the sources have weak Ly$\alpha$, emission line features, which may relate to different sub-phases of the central active galactic nuclei (AGNs). Our SCUBA2 survey confirms the trend reported in the literature that quasars with submillimeter detections tend to have weaker ultraviolet (UV) emission lines compared to quasars with nondetections. The connection between weak UV quasar line emission and bright dust continuum emission powered by massive star formation may suggest an early phase of AGN-galaxy evolution, in which the broad line region is starting to develop slowly or is shielded from the central ionization source, and has unusual properties such as weak line features or bright FIR emission.

28 pages, 10 figures, published in ApJ

References in corpus (32)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• A luminous quasar at a redshift of z = 7.085
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• The Pan-STARRS1 distant z>5.6 quasar survey: more than 100 quasars within the first Gyr of the universe
• 350 Micron Dust Emission from High Redshift Quasars
• The Final SDSS High-Redshift Quasar Sample of 52 Quasars at z>5.7
• Physical properties of 15 quasars at $z\gtrsim 6.5$
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
• A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang
• Rapidly star-forming galaxies adjacent to quasars at redshifts exceeding 6
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• Star formation and the interstellar medium in z>6 UV-luminous Lyman-break galaxies
• Star formation in the hosts of high-z QSOs: Evidence from Spitzer PAH detections
• Thermal Emission from Warm Dust in the Most Distant Quasars
• Supermassive black holes with high accretion rates in active galactic nuclei: II. the most luminous standard candles in the Universe
• Discovery of eight z ~ 6 quasars from Pan-STARRS1
• Constraining the radio-loud fraction of quasars at z>5.5
• Millimeter and Radio Observations of z~6 Quasars
• Two bright z > 6 quasars from VST ATLAS and a new method of optical plus mid-infra-red colour selection
• The discovery of the first luminous z~6 quasar in the UKIDSS Large Area Survey
• Bright [CII] 158$\mu$m emission in a quasar host galaxy at $z=6.54$
• Weak Emission Line Quasars in the Context of a Modified Baldwin Effect
• Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
• Double tidal disruptions in galactic nuclei
• No signs of star formation being regulated in the most luminous quasars at z~2 with ALMA
• Environments of z>5 quasars: searching for protoclusters at submillimetre wavelengths
• SHARC-II 350 micron Observations of Thermal Emission from Warm Dust in z>=5 Quasars
• Kiloparsec-Scale Simulations of Star Formation in Disk Galaxies III. Structure and Dynamics of Filaments and Clumps in Giant Molecular Clouds
• Submm-bright X-ray absorbed QSOs at z~2: insights into the co-evolution of AGN and star-formation

Cited by in corpus (8)

• The Pan-STARRS1 z>5.6 quasar survey II: Discovery of 55 Quasars at 5.6<z<6.5
• The Infrared Emission and Vigorous Star Formation of Low-redshift Quasars
• Constraining galaxy overdensities around three z~6.5 quasars with ALMA and MUSE
• The interstellar medium distribution, gas kinematics, and system dynamics of the far-infrared luminous quasar SDSS J2310+1855 at $z=6.0$
• A Mixture of LBG Overdensities in the Fields of Three $6<z<7$ Quasars: Implications for the Robustness of Photometric Selection
• ALMACAL. XI. Over-densities as signposts to proto-clusters? A cautionary tale
• Cospatial 21 cm and metal-line absorbers in the epoch of reionization -- I : Incidence and observability
• The Radio Galaxy Environment Reference Survey (RAGERS): a submillimetre study of the environments of massive radio-quiet galaxies at $z=1-3$