G. Violino
A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?
Violino, G.; Coppin, K.E.K.; Stevens, J.A.; Farrah, D.; Geach, J.E.; Alexander, D.M.; Hickox, R.; Smith, D.J.B.; Wardlow, J.L.
Authors
K.E.K. Coppin
J.A. Stevens
D. Farrah
J.E. Geach
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
R. Hickox
D.J.B. Smith
J.L. Wardlow
Abstract
It is thought that a class of broad absorption line (BAL) QSOs, characterized by Fe absorption features in their UV spectra (called ‘FeLoBALs’), could mark a transition stage between the end of an obscured starburst event and a youthful QSO beginning to shed its dust cocoon, where Fe has been injected into the interstellar medium by the starburst. To test this hypothesis, we have undertaken deep Submillimetre Common-User Bolometer Array 2 (SCUBA-2) 850 μm observations of a sample of 17 FeLoBAL QSOs with 0.89 ≤ z ≤ 2.78 and −23.31 ≤ MB ≤ −28.50 to directly detect an excess in the thermal emission of the dust which would probe enhanced star formation activity. We find that FeLoBALs are not luminous sources in the sub-mm, none of them are individually detected at 850 μm, nor as a population through stacking (Fs = 1.14 ± 0.58 mJy). Statistical and survival analyses reveal that FeLoBALs have sub-mm properties consistent with BAL and non-BAL QSOs with matched redshifts and magnitudes. An Spectral Energy Distribution fitting analysis shows that the far-infrared emission is dominated by active galactic nuclei activity, and a starburst component is required only in 6/17 sources of our sample; moreover the integrated total luminosity of 16/17 sources is L ≥ 1012 L⊙, high enough to classify FeLoBALs as infrared luminous. In conclusion, we do not find any evidence in support of FeLoBAL QSOs being a transition population between an ultraluminous infrared galaxy (ULIRG) and an unobscured QSO; in particular, FeLoBALs are not characterized by a cold starburst which would support this hypothesis.
Citation
Violino, G., Coppin, K., Stevens, J., Farrah, D., Geach, J., Alexander, D., …Wardlow, J. (2016). A SCUBA-2 survey of FeLoBAL QSOs. Are FeLoBALs in a ‘transition phase’ between ULIRGs and QSOs?. Monthly Notices of the Royal Astronomical Society, 457(2), 1371-1384. https://doi.org/10.1093/mnras/stv2937
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 15, 2015 |
Online Publication Date | Feb 4, 2016 |
Publication Date | Apr 1, 2016 |
Deposit Date | May 31, 2016 |
Publicly Available Date | Jun 15, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 457 |
Issue | 2 |
Pages | 1371-1384 |
DOI | https://doi.org/10.1093/mnras/stv2937 |
Related Public URLs | http://adsabs.harvard.edu/abs/2016MNRAS.457.1371V |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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