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Galaxies 2016, 4(4), 77; doi:10.3390/galaxies4040077

Asymmetric Star Formation Efficiency Due to Ram Pressure Stripping

1
Centro de Astro-Ingeniería and Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
2
Instituto de Astronomía Teórica y Experimental, UNC-CONICET, Córdoba X5000BGR, Argentina
3
International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
4
Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), 44 Rosehill Street Redfern, NSW 2016, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Stefano Ettori and Dominique Eckert
Received: 6 September 2016 / Revised: 25 November 2016 / Accepted: 5 December 2016 / Published: 13 December 2016
(This article belongs to the Special Issue Exploring the Outskirts of Galaxy Clusters)
View Full-Text   |   Download PDF [428 KB, uploaded 13 December 2016]   |  

Abstract

Previous works have shown that a dense cluster environment affects satellite galaxy properties and accelerates or truncates their evolutionary processes. In this work, we use the EAGLE simulation to study this effect, dissecting the galaxies in two halves: the one that is falling directly to the cluster (leading half) and the one behind (trailing half). Considering all galaxies within the virial radius of the most massive groups and clusters of the simulation ( M h a l o > 10 13 . 8 [ M ] ), we find that on average the leading half presents an enhancement of the star formation rate with respect to the trailing half. We conclude that galaxies falling into the intra-cluster medium experience a boost in star-formation in their leading half due to ram pressure. Sparse observations of jellyfish galaxies have revealed visually the enhancement of the star formation in the leading half. In order to confirm this effect statistically using observations, different cases must be investigated using the simulation as a test dataset. View Full-Text
Keywords: galaxy; clusters; ram pressure; jellyfish galaxies galaxy; clusters; ram pressure; jellyfish galaxies
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Troncoso Iribarren, P.; Padilla, N.; Contreras, S.; Rodriguez, S.; García-Lambas, D.; Lagos, C.P. Asymmetric Star Formation Efficiency Due to Ram Pressure Stripping. Galaxies 2016, 4, 77.

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