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Ultraviolet tails and trails in cluster galaxies: a sample of candidate gaseous stripping events in Coma

Smith, Russell J.; Lucey, John R.; Hammer, Derek; Hornschemeier, Ann E.; Carter, David; Hudson, Michael J.; Marzke, Ronald O.; Mouhcine, Mustapha; Eftekharzadeh, Sareh; James, Phil; Khosroshahi, Habib; Kourkchi, Ehsan; Karick, Arna

Ultraviolet tails and trails in cluster galaxies: a sample of candidate gaseous stripping events in Coma Thumbnail


Derek Hammer

Ann E. Hornschemeier

David Carter

Michael J. Hudson

Ronald O. Marzke

Mustapha Mouhcine

Sareh Eftekharzadeh

Phil James

Habib Khosroshahi

Ehsan Kourkchi

Arna Karick


We have used new deep observations of the Coma cluster from Galaxy Evolution Explorer to visually identify 13 star-forming galaxies with asymmetric morphologies in the ultraviolet (UV). Aided by wide-field optical broad-band and Hα imaging, we interpret the asymmetric features as being due to star formation within gas stripped from the galaxies by interaction with the cluster environment. The selected objects display a range of structures from broad fan-shaped systems of filaments and knots (‘jellyfish’) to narrower and smoother tails extending up to 100 kpc in length. Some of the features have been discussed previously in the literature, while others are newly identified here. We assess the ensemble properties of the sample. The candidate stripping events are located closer to the cluster centre than other star-forming galaxies; their radial distribution is more similar to that of all cluster members, dominated by passive galaxies. The fraction of blue galaxies which are undergoing stripping falls from 40 per cent in the central 500 kpc to less than 5 per cent beyond 1 Mpc. We find that tails pointing away from (i.e. galaxies moving towards) the cluster centre are strongly favoured (11/13 cases). From the small number of ‘outgoing’ galaxies with stripping signatures, we conclude that the stripping events occur primarily on first passage towards the cluster centre, and are short-lived compared to the cluster crossing time. Using galaxy infall trajectories extracted from a cosmological simulation, we find that the observed fraction of blue galaxies undergoing stripping can be reproduced if the events are triggered at a threshold radius of ∼1 Mpc and detectable for ∼500 Myr. Hubble Space Telescope images are available for two galaxies from our sample and reveal compact blue knots coincident with UV and Hα emission, apparently forming stars within the stripped material. Our results confirm that stripping of gas from infalling galaxies, and associated star formation in the stripped material, is a widespread phenomenon in rich clusters. Deep UV imaging of additional clusters is a promising route to constructing a statistically powerful sample of stripping events and constraining models for the truncation of star formation in clusters.


Smith, R. J., Lucey, J. R., Hammer, D., Hornschemeier, A. E., Carter, D., Hudson, M. J., …Karick, A. (2010). Ultraviolet tails and trails in cluster galaxies: a sample of candidate gaseous stripping events in Coma. Monthly Notices of the Royal Astronomical Society, 408(3), 1417-1432.

Journal Article Type Article
Acceptance Date Jun 25, 2010
Online Publication Date Oct 19, 2010
Publication Date Nov 1, 2010
Deposit Date Jan 20, 2012
Publicly Available Date Sep 20, 2018
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 408
Issue 3
Pages 1417-1432
Related Public URLs


Published Journal Article (4.8 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2010 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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