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dc.contributor.authorKimball, A.
dc.contributor.authorLacy, M.
dc.contributor.authorLonsdale, C.
dc.contributor.authorMacquart, Jean-Pierre
dc.date.accessioned2017-01-30T12:13:59Z
dc.date.available2017-01-30T12:13:59Z
dc.date.created2015-10-29T04:09:18Z
dc.date.issued2015
dc.identifier.citationKimball, A. and Lacy, M. and Lonsdale, C. and Macquart, J. 2015. ALMA detection of a disc-dominated [C II] emission line at z = 4.6 in the luminous QSO J1554+1937. Monthly Notices of the Royal Astronomical Society. 452 (1): pp. 88-98.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/19453
dc.identifier.doi10.1093/mnras/stv1160
dc.description.abstract

We present observations and analysis of an unusual [C ii] emission line in the very luminous quasi-stellar object (QSO) SDSS J155426.16+193703.0 at z ~ 4.6. The line is extremely broad (full width at half-maximum 735 km s−1) and seems to have a flat-topped or double-peaked line profile. A velocity map of the line shows a gradient across the source that indicates large-scale rotation of star-forming gas. Together, the velocity map and line profile suggest the presence of a massive rotating disc with a dynamical mass Mdyn ≳5×1010 M☉. Using the assumption of a rotating disc origin, we employ an empirical relation between galaxy disc circular velocity and bulge velocity dispersion (σ) to estimate that σ > 310 km s−1, subject to a correction for the unknown disc inclination. This result implies that this source is consistent with the local M–σ relation, or offset at most by an order of magnitude in black hole mass. In contrast, the assumption of a bulge origin for the [C ii] emission line would lead to a conclusion that the black hole is nearly two orders of magnitude more massive than predicted by the M–σ relation, similar to previous findings for other high-redshift QSOs. As disc rotation may be a common origin for [C ii] emission at high redshifts, these results stress that careful consideration of dynamical origins is required when using observations of this line to derive properties of high-redshift galaxies.

dc.publisherOxford University Press
dc.titleALMA detection of a disc-dominated [C II] emission line at z = 4.6 in the luminous QSO J1554+1937
dc.typeJournal Article
dcterms.source.volume452
dcterms.source.number1
dcterms.source.startPage88
dcterms.source.endPage98
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.departmentCurtin Institute of Radio Astronomy (Physics)
curtin.accessStatusOpen access


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