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The spatially resolved dynamics of dusty starburst galaxies in a z ~ 0.4 cluster: Beginning the transition from spirals to S0s

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.

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© 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.

Publication metadata

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

Year: 2016

Volume: 460

Issue: 1

Pages: 1059-1076

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


DOI: 10.1093/mnras/stw1030


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