2014MNRAS.439.1948Y


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST13:25:15

2014MNRAS.439.1948Y - Mon. Not. R. Astron. Soc., 439, 1948-1958 (2014/April-1)

Tidal-induced lopsidedness in Magellanic-type galaxies.

YOZIN C. and BEKKI K.

Abstract (from CDS):

We investigate the tidally induced conversion of barred late-type spirals to Magellanic-type discs with numerical simulations, to establish how the lifetime of lopsidedness (asymmetry) varies with numerical parametrizations. Using a reference model based on observed properties of the Large Magellanic Cloud (LMC), we show that its off-centre bar, one-arm spiral and one-sided star formation can be induced by a brief tidal interaction. We thereafter perform a detailed parameter study, and find that at the dynamical mass of LMC-type discs ( ∼ 1010 M), stellar lopsidedness (as quantified by the m = 1 Fourier mode) and bar off-centredness can vary widely in amplitude, but are generally short-lived ( ∼ Gyr). Tidal interactions induce more persistent lopsidedness in lower mass galaxies (several Gyr), in particular those with large halo-to-disc mass ratios as implied by recent halo occupation models. We suggest that the tidal interactions play a larger role in the observed ubiquity of lopsidedness than the presently favoured gas accretion mechanism for lower mass galaxies. Other characteristics of Magellanic-type galaxies, such as one-sided star formation, are quantified and tend to arise more prominently in discs with later-type spiral structure (more halo-dominated inner disc, weaker bars) following retrograde orbital encounters.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: dwarf - galaxies: interactions - Magellanic Clouds

Simbad objects: 12

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Number of rows : 12

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 NAME Magellanic Stream HVC 00 32 -30.0           ~ 841 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9756 1
3 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 714 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5904 1
5 NAME LMC Bar ? 05 22 08 -69 23.5           ~ 270 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15285 1
7 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1785 1
8 NGC 4027 IG 11 59 30.168 -19 15 54.62   11.71 11.10 10.60 11.5 ~ 235 1
9 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1039 1
10 NGC 4618 GiP 12 41 32.8926165605 +41 09 03.051998352 11.03 11.22 10.78     ~ 299 2
11 NGC 4625 GiP 12 41 52.701 +41 16 25.39 12.74 12.92 12.35     ~ 319 2
12 NGC 4628 Sy2 12 42 25.276 -06 58 15.47   13.8   13.5 12.9 ~ 66 0

    Equat.    Gal    SGal    Ecl

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2021.04.14-13:25:15

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