SCUBA2 high redshift bright quasar survey: Far-infrared properties and weak-line features

Qiong Li, Ran Wang, Xiaohui Fan, Xue Bing Wu, Linhua Jiang, Eduardo Banados, Bram Venemans, Yali Shao, Jianan Li, Yunhao Zhang, Chengpeng Zhang, Jeff Wagg, Roberto Decarli, Chiara Mazzucchelli, Alain Omont, Frank Bertoldi

Research output: Contribution to journalArticlepeer-review

Abstract

We present a submillimeter 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 the range of 0.2−5×1014 L, 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 850µm rms sensitivity of 1.2 mJy beam1 (Sν,850 µm = 4–5 mJy, at > 3.5σ). The new SHERRY detections indicate far-infrared (FIR) luminosities of 3.5×1012 to 1.4×1013 L, implying extreme star formation rates of 90-1060 M yr1 in the quasar host galaxies. Compared with z = 2−5 samples, the FIR-luminous quasars (LFIR > 1013 L) are more rare at z ∼ 6. The optical/near-infrared (NIR) spectra of these objects show that 11% (6/54) of the sources have weak Lyα 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 non-detections. 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 shielded from the central ionization source, and has unusual properties such as weak-line features or bright FIR emission.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Sep 2 2020

Keywords

  • Cosmology: observations
  • Galaxies: active
  • Galaxies: high redshift
  • Quasars: general
  • Submillimeter: galaxies

ASJC Scopus subject areas

  • General

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