A SCUBA-2 850$\mu$m Survey of Heavily Reddened Quasars at z~2

Abstract

We present new 850$\mu$m SCUBA-2 observations for a sample of 19 heavily reddened Type-I quasars at redshifts $z\sim$2 with dust extinctions of A${}_{\mathrm{V}}\simeq 2-6$ mag. Three of the 19 quasars are detected at $>$3$\sigma$ significance corresponding to an 850$\mu$m flux-limit of $\gtrsim$4.8 mJy. Assuming the 850$\mu$m flux is dominated by dust heating due to star formation, very high star formation rates (SFR) of $\sim$2500-4500 M${}_{\odot }$ yr${}^{-1}$ in the quasar host galaxies are inferred. Even when considering a large contribution to the 850$\mu$m flux from dust heated by the quasar itself, significant SFRs of $\sim$600-1500 M${}_{\odot }$ yr${}^{-1}$ are nevertheless inferred for two of the three detected quasars. We stack the remaining 16 heavily reddened quasars and derive an average 3$\sigma$ upper limit on the SFRs in these quasar host galaxies of $<$880 M${}_{\odot }$ yr${}^{-1}$. The number counts of sub-mm galaxies in the total survey area (134.3arcmin${}^2$) are consistent with predictions from blank-field surveys. There are, however, individual quasars where we find evidence for an excess of associated sub-mm galaxies. For two quasars, higher spatial resolution and spectroscopic ALMA observations confirm the presence of an excess of sub-mm sources. We compare the 850$\mu$m detection rate of our quasars to both unobscured, ultraviolet luminous quasars as well as the much more obscured population of mid-infrared luminous Hot Dust Obscured Galaxies (HotDOGs). When matched by luminosity and redshift, we find no significant differences in the 850$\mu$m flux densities of these various quasar populations given the current small sample sizes.

11 pages, 9 figures, MNRAS Accepted

References in corpus (17)

• Cosmic Star Formation History
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• 350 Micron Dust Emission from High Redshift Quasars
• The SCUBA-2 Cosmology Legacy Survey: 850um maps, catalogues and number counts
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• The First Hyper-Luminous Infrared Galaxy Discovered by WISE
• Heavily reddened type 1 quasars at z > 2 I: Evidence for significant obscured black-hole growth at the highest quasar luminosities
• The mean star formation rates of unobscured QSOs: searching for evidence of suppressed or enhanced star formation
• Dust-Deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission
• Restframe Optical Spectroscopic Classifications for Submillimeter Galaxies
• Submillimetre observations of WISE-selected high-redshift, luminous, dusty galaxies
• The Discovery of Gas-Rich, Dusty Starbursts in Luminous Reddened Quasars at $z\sim 2.5$ with ALMA
• The Intrinsic Far-infrared Continua of Type-1 Quasars
• What produces the far-infrared/submm emission in the most luminous QSOs?
• [OIII] Emission Line Properties in a New Sample of Heavily Reddened Quasars at $z>2$
• Submillimetre observations of WISE/radio-selected AGN and their environments
• UV-Luminous, Star-Forming Hosts of z~2 Reddened Quasars in the Dark Energy Survey

Cited by in corpus (7)

• The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening
• Dust-Enshrouded AGN can Dominate Host-Galaxy-Scale Cold-Dust Emission
• Submillimetre galaxies in two massive protoclusters at z = 2.24: witnessing the enrichment of extreme starbursts in the outskirts of HAE density peaks
• Resolving Disks & Mergers in $z\sim 2$ Heavily Reddened Quasars and their Companion Galaxies with ALMA
• ASW${}^2$DF: Census of the obscured star formation in a galaxy cluster in formation at $z=2.2$
• Submillimeter galaxy overdensities around physically associated quasar pairs
• The Radio Galaxy Environment Reference Survey (RAGERS): a submillimetre study of the environments of massive radio-quiet galaxies at $z=1-3$