2015A&A...575A..16M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET11:49:22

2015A&A...575A..16M - Astronomy and Astrophysics, volume 575A, 16-16 (2015/3-1)

Building gas rings and rejuvenating S0 galaxies through minor mergers.

MAPELLI M., RAMPAZZO R. and MARINO A.

Abstract (from CDS):

We investigate the effects of minor mergers between an S0 galaxy and a gas-rich satellite galaxy, by means of N-body/smoothed particle hydrodynamics simulations. The satellite galaxy is initially on a nearly parabolic orbit and undergoes several periapsis passages before being completely stripped. In most simulations, a portion of the stripped gas forms a warm dense gas ring in the S0 galaxy, with a radius of ∼6-13kpc and a mass of ∼107M. The ring is generally short-lived (≲3Gyr) if it forms from prograde encounters, while it can live for more than 6Gyr if it is born from counter-rotating or non-coplanar interactions. The gas ring keeps memory of the initial orbit of the satellite galaxy: it is corotating (counter-rotating) with the stars of the disc of the S0 galaxy, if it originates from prograde (retrograde) satellite orbits. Furthermore, the ring is coplanar with the disc of the S0 galaxy only if the satellite's orbit was coplanar, while it lies on a plane that is inclined with respect to the disc of the S0 galaxy by the same inclination angle as the orbital plane of the satellite galaxy. The fact that we form polar rings as long-lived and as massive as co-planar rings suggests that rings can form in S0 galaxies even without strong bar resonances. Star formation up to 0.01M/yr occurs for >6Gyr in the central parts of the S0 galaxy as a consequence of the interaction. We discuss the implications of our simulations for the rejuvenation of S0 galaxies in the local Universe.

Abstract Copyright:

Journal keyword(s): galaxies: interactions - methods: numerical - galaxies: kinematics and dynamics - galaxies: star formation - galaxies: ISM

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1533 GiG 04 09 51.8352578260 -56 07 06.404418566   11.77 10.92 10.27 11.0 ~ 179 0
2 NGC 2962 GiP 09 40 53.9319870230 +05 09 57.021439517   13.1       ~ 183 0
3 NGC 2974 Sy2 09 42 33.267 -03 41 56.82   12.19   10.77   ~ 415 0
4 NGC 4245 GiG 12 17 36.7828268294 +29 36 28.901023066   12.4       ~ 168 0
5 NGC 5636 GiP 14 29 39.0117751787 +03 15 58.688657848   13.70       ~ 57 1

    Equat.    Gal    SGal    Ecl

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2021.03.04-11:49:22

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