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Galaxies 2015, 3(4), 192-201; doi:10.3390/galaxies3040192

Back to the Green Valley: How to Rejuvenate an S0 Galaxy through Minor Mergers

INAF—Astronomical Observatory of Padova, Vicolo dell’Osservatorio 5, Padova 35122, Italy
Academic Editors: Alexei Moiseev, José Alfonso López Aguerri and Enrichetta Iodice
Received: 14 October 2015 / Revised: 8 November 2015 / Accepted: 10 November 2015 / Published: 13 November 2015
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Abstract

About half of the S0 galaxies in the nearby Universe show signatures of recent or ongoing star formation. Whether these S0 galaxies were rejuvenated by the accretion of fresh gas is still controversial. We study minor mergers of a gas-rich dwarf galaxy with an S0 galaxy, by means of N-body smoothed-particle hydrodynamics simulations. We find that minor mergers trigger episodes of star formation in the S0 galaxy, lasting for \(\sim\)10 Gyr. One of the most important fingerprints of the merger is the formation of a gas ring in the S0 galaxy. The ring is reminiscent of the orbit of the satellite galaxy, and its lifetime depends on the merger properties: polar and counter-rotating satellite galaxies induce the formation of long-lived smooth gas rings. View Full-Text
Keywords: galaxies: interactions; methods: numerical; galaxies: kinematics and dynamics;galaxies: ISM; galaxies: star formation galaxies: interactions; methods: numerical; galaxies: kinematics and dynamics;galaxies: ISM; galaxies: star formation
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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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Mapelli, M. Back to the Green Valley: How to Rejuvenate an S0 Galaxy through Minor Mergers. Galaxies 2015, 3, 192-201.

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