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Lookup NU author(s): Dr Christopher HarrisonORCiD
This is the final published version of an article that has been published in its final definitive form by Oxford University Press, 2016.
For re-use rights please refer to the publisher's terms and conditions.
© 2016 The Authors. Published by Oxford University Press on behalf of The Royal Astronomical Society. To investigate what drives the reversal of the morphology-density relation at intermediate/high redshift, we present a multiwavelength analysis of 27 dusty starburst galaxies in the massive clusterCl 0024+17 at z=0.4. We combineHa dynamical maps from theVLT/FLAMES multi- IFU systemwith far-infrared imaging using Herschel/SPIRE and millimetre spectroscopy from IRAM/NOEMA, in order to measure the dynamics, star formation rates and gas masses of this sample. Most galaxies appear to be rotationally supported, with a median ratio of rotationalsupport to line-of-sight velocity dispersion v/σ ~ 5 ± 2, and specific angular momentum λR = 0.83 ± 0.06 - comparable to field spirals of a similar mass at this redshift. The star formation rates of 3-26 M⊙ yr-1 and average 12CO-derived gas mass of ~ 1 × 1010 M⊙ suggest gas depletion time-scales of ~1 Gyr (~0.25 of the cluster crossing time). We derive characteristic dust temperatures (mean Td = 26 ± 1 K) consistent with local galaxies of similar far-infrared luminosity, suggesting that the low-density gas is yet to be stripped. Taken together, these results suggest that these starbursts have only recently accreted from the field, with star formation rates likely enhanced due to the effects of ram pressure. In order to make the transition to cluster S0s these galaxies must lose ~40 per cent of their specific angular momentum. We suggest this must occur ≥1Gyr later, after the molecular gas has been depleted and/or stripped, via multiple tidal interactions with other cluster members.
Author(s): Johnson HL, Harrison CM, Swinbank AM, Bower RG, Smail I, Koyama Y, Geach JE
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Print publication date: 21/07/2016
Online publication date: 04/05/2016
Acceptance date: 28/04/2016
Date deposited: 04/02/2020
ISSN (print): 0035-8711
ISSN (electronic): 1365-2966
Publisher: Oxford University Press
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