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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

Johnson, H.L.; Harrison, C.M.; Swinbank, A.M.; Bower, R.G.; Smail, I.; Koyama, Y.; Geach, J.E.

The Spatially Resolved Dynamics of Dusty Starburst Galaxies in a z ~ 0.4 Cluster: Beginning the Transition from Spirals to S0s Thumbnail


Authors

H.L. Johnson

C.M. Harrison

R.G. Bower

Y. Koyama

J.E. Geach



Abstract

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 cluster Cl 0024+17 at z = 0.4. We combine Hα dynamical maps from the VLT/FLAMES multi-IFU system with 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 rotational-support 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 ≥1 Gyr later, after the molecular gas has been depleted and/or stripped, via multiple tidal interactions with other cluster members.

Citation

Johnson, H., Harrison, C., Swinbank, A., Bower, R., Smail, I., Koyama, Y., & Geach, J. (2016). The Spatially Resolved Dynamics of Dusty Starburst Galaxies in a z ~ 0.4 Cluster: Beginning the Transition from Spirals to S0s. Monthly Notices of the Royal Astronomical Society, 460(1), 1059-1076. https://doi.org/10.1093/mnras/stw1030

Journal Article Type Article
Acceptance Date Apr 28, 2016
Online Publication Date May 1, 2016
Publication Date Jul 21, 2016
Deposit Date May 24, 2016
Publicly Available Date Jun 1, 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 460
Issue 1
Pages 1059-1076
DOI https://doi.org/10.1093/mnras/stw1030
Public URL https://durham-repository.worktribe.com/output/1411625
Related Public URLs http://arxiv.org/abs/1605.01058

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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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