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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25056
Title: Shapley Supercluster Survey: ram-pressure stripping versus tidal interactions in the Shapley supercluster
Authors: MERLUZZI, Paola 
BUSARELLO, Giovanni 
Dopita, M. A.
Haines, C. P.
Steinhauser, D.
Bourdin, H.
Mazzotta, P.
Issue Date: 2016
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 460
Issue: 3
First Page: 3345
Abstract: We present two new examples of galaxies undergoing transformation in the Shapley supercluster core. These low-mass (M_{star }∼ 0.4-1× 10^{10} M<SUB>☉</SUB>) galaxies are members of the two clusters SC 1329-313 (z ∼ 0.045) and SC 1327-312 (z ∼ 0.049). Integral-field spectroscopy complemented by imaging in the ugriK bands and in Hα narrow band is used to disentangle the effects of tidal interaction (TI) and ram-pressure stripping (RPS). In both galaxies, SOS 61086 and SOS 90630, we observe one-sided extraplanar ionized gas extending respectively ∼30 and ∼41 kpc in projection from their discs. The galaxies' gaseous discs are truncated, and the kinematics of the stellar and gas components are decoupled, supporting the RPS scenario. The emission of the ionized gas extends in the direction of a possible companion for both galaxies suggesting a TI. The overall gas velocity field of SOS 61086 is reproduced by ad hoc N-body/hydrodynamical simulations of RPS acting almost face-on and starting ∼250 Myr ago, consistent with the age of the young stellar populations. A link between the observed gas stripping and the cluster-cluster interaction experienced by SC 1329-313 and A3562 is suggested. Simulations of ram pressure acting almost edge-on are able to fully reproduce the gas velocity field of SOS 90630, but cannot at the same time reproduce the extended tail of outflowing gas. This suggests that an additional disturbance from a TI is required. This study adds a piece of evidence that RPS may take place in different environments with different impacts and witnesses the possible effect of cluster-cluster merger on RPS.
URI: http://hdl.handle.net/20.500.12386/25056
URL: https://academic.oup.com/mnras/article/460/3/3345/2609457
ISSN: 0035-8711
DOI: 10.1093/mnras/stw1198
Bibcode ADS: 2016MNRAS.460.3345M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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