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Ionized gas discs in elliptical and S0 galaxies at z < 1

Jaffe, Yara L.; Aragón-Salamanca, Alfonso; Ziegler, Bodo; Kuntschner, Harald; Zaritsky, Dennis; Rudnick, Gregory; Poggianti, Bianca M.; Hoyos, Carlos; Halliday, Claire; Demarco, Ricardo

Authors

Yara L. Jaffe

Bodo Ziegler

Harald Kuntschner

Dennis Zaritsky

Gregory Rudnick

Bianca M. Poggianti

Carlos Hoyos

Claire Halliday

Ricardo Demarco



Abstract

We analyse the extended, ionized-gas emission of 24 early-type galaxies (ETGs) at 0 < z < 1 from the ESO Distant Cluster Survey (EDisCS). We discuss different possible sources of ionization and favour star formation as the main cause of the observed emission. 10 galaxies have disturbed gas kinematics, while 14 have rotating gas discs. In addition, 15 galaxies are in the field, while 9 are in the infall regions of clusters. This implies that, if the gas has an internal origin, this is likely stripped as the galaxies get closer to the cluster centre. If the gas instead comes from an external source, then our results suggest that this is more likely acquired outside the cluster environment, where galaxy–galaxy interactions more commonly take place. We analyse the Tully–Fisher relation of the ETGs with gas discs, and compare them to EDisCS spirals. Taking a matched range of redshifts, MB < −20, and excluding galaxies with large velocity uncertainties, we find that, at fixed rotational velocity, ETGs are 1.7 mag fainter in MB than spirals. At fixed stellar mass, we also find that ETGs have systematically lower specific star formation rates than spirals. This study constitutes an important step forward towards the understanding of the evolution of the complex ISM in ETGs by significantly extending the look-back-time baseline explored so far.

Citation

Jaffe, Y. L., Aragón-Salamanca, A., Ziegler, B., Kuntschner, H., Zaritsky, D., Rudnick, G., …Demarco, R. (2014). Ionized gas discs in elliptical and S0 galaxies at z < 1. Monthly Notices of the Royal Astronomical Society, 440(4), https://doi.org/10.1093/mnras/stu507

Journal Article Type Article
Acceptance Date Mar 9, 2014
Publication Date May 1, 2014
Deposit Date Apr 20, 2017
Publicly Available Date Apr 20, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 440
Issue 4
DOI https://doi.org/10.1093/mnras/stu507
Keywords galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: ISM, galaxies: kinematics and dynamics
Public URL http://eprints.nottingham.ac.uk/id/eprint/42055
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stu507
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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