Star Formation in Luminous LoBAL Quasars at 2.0<z<2.5

Abstract

Low-ionisation broad absorption line quasars (LoBALs) mark an important, yet poorly understood, population of quasars showing direct evidence for energetic mass outflows. We outline a sample of 12 luminous (L${}_{\mathrm{bol}}$ $>$10${}^{46}$ergs${}^{-1}$) LoBALs at 2.0$<$z$<$2.5 - a key epoch in both star formation and black hole accretion, which have been imaged as part of a targeted program with the \textit{Herschel} Spectral and Photometric Imaging REceiver (SPIRE). We present K-band NOTCam spectra for three of these targets, calculating their spectroscopic redshifts, black hole masses and bolometric luminosities, and increasing the total number of LoBAL targets in our sample with spectral information from five to eight. Based on FIR obeservations from \textit{Herschel} SPIRE, we derive prolific SFRs ranging 740 - 2380M${}_{\odot }$yr${}^{-1}$ for the detected targets, consistent with LoBALs existing in an evolutionary phase associated with starburst activity. Furthermore, an upper limit of $<$440M${}_{\odot }$yr${}^{-1}$ is derived for the non-detections, meaning moderate-to-high SFRs cannot be ruled out, even among the undetected targets. Indeed, we detect an enhancement in both the SFRs and FIR fluxes of LoBALs compared to HiBAL and non-BAL quasars, further supporting the evolutionary LoBAL paradigm. Despite this enhancement in SFR however, the environments of LoBALs appear entirely consistent with the general galaxy population at 2.0$<$z$<$2.5.

13 pages, 10 figures, Accepted to MNRAS

References in corpus (12)

• Cosmic Star Formation History
• The Sloan Digital Sky Survey Quasar Catalog IV. Fifth Data Release
• unWISE: unblurred coadds of the WISE imaging
• The (black hole)-bulge mass scaling relation at low masses
• Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
• The AGN Outflow in the HDFS Target QSO J2233-606 from a High-Resolution VLT/UVES Spectrum
• Evidence that FeLoBALs may signify the transition between an ultraluminous infrared galaxy and a quasar
• No signs of star formation being regulated in the most luminous quasars at z~2 with ALMA
• Intrinsic AGN SED & black hole growth in the Palomar--Green quasars
• A sensitive submillimetre survey of Broad Absorption Line quasars
• Near-IR spectroscopy of luminous LoBAL quasars at 1<z<2.5
• The mid-infrared and CO gas properties of an extreme star-forming FeLoBAL quasar

Cited by in corpus (4)

• The fraction and kinematics of broad absorption line quasars across cosmic time
• Connecting radio emission to AGN wind properties with Broad Absorption Line Quasars
• A Targeted Search for Variable Gravitationally Lensed Quasars
• The Nature of LoBAL QSOs: II. HST/WFC3 Observations Reveal Host Galaxies Dominated by Mergers