The LABOCA survey of the Extended Chandra Deep Field-South: clustering of submillimetre galaxies
Hickox, R.C.; Wardlow, J.L.; Smail, I.; Myers, A.D.; Alexander, D.M.; Swinbank, A.M.; Danielson, A.L.R.; Stott, J.P.; Chapman, S.C.; Coppin, K.E.K.; Dunlop, J.S.; Gawiser, E.; Lutz, D.; van der Werf, P.; Weiss, A.
Professor Ian Smail firstname.lastname@example.org
Professor David Alexander email@example.com
P. van der Werf
We present a measurement of the spatial clustering of submillimetre galaxies (SMGs) at z= 1–3. Using data from the 870 μm Large APEX Bolometer Camera (LABOCA) submillimetre survey of the Extended Chandra Deep Field-South, we employ a novel technique to measure the cross-correlation between SMGs and galaxies, accounting for the full probability distributions for photometric redshifts of the galaxies. From the observed projected two-point cross-correlation function we derive the linear bias and characteristic dark matter halo masses for the SMGs. We detect clustering in the cross-correlation between SMGs and galaxies at the >4σ level. Accounting for the clustering of galaxies from their autocorrelation function, we estimate an autocorrelation length for SMGs of Graphic Mpc assuming a power-law slope γ= 1.8, and derive a corresponding dark matter halo mass of Graphic. Based on the evolution of dark matter haloes derived from simulations, we show that that the z= 0 descendants of SMGs are typically massive (∼2–3L*) elliptical galaxies residing in moderate- to high-mass groups (Graphic). From the observed clustering we estimate an SMG lifetime of ∼100 Myr, consistent with lifetimes derived from gas consumption times and star formation time-scales, although with considerable uncertainties. The clustering of SMGs at z∼ 2 is consistent with measurements for optically selected quasi-stellar objects (QSOs), supporting evolutionary scenarios in which powerful starbursts and QSOs occur in the same systems. Given that SMGs reside in haloes of characteristic mass ∼6 × 1012 h−1 M⊙, we demonstrate that the redshift distribution of SMGs can be described remarkably well by the combination of two effects: the cosmological growth of structure and the evolution of the molecular gas fraction in galaxies. We conclude that the powerful starbursts in SMGs likely represent a short-lived but universal phase in massive galaxy evolution, associated with the transition between cold gas-rich, star-forming galaxies and passively evolving systems.
Hickox, R., Wardlow, J., Smail, I., Myers, A., Alexander, D., Swinbank, A., …Weiss, A. (2012). The LABOCA survey of the Extended Chandra Deep Field-South: clustering of submillimetre galaxies. Monthly Notices of the Royal Astronomical Society, 421(1), 284-295. https://doi.org/10.1111/j.1365-2966.2011.20303.x
|Journal Article Type||Article|
|Acceptance Date||Nov 30, 2011|
|Online Publication Date||Mar 21, 2012|
|Publication Date||Mar 21, 2012|
|Deposit Date||Jun 13, 2012|
|Publicly Available Date||Apr 22, 2016|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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