2008MNRAS.388..697M

Query : 2008MNRAS.388..697M

2008MNRAS.388..697M - Mon. Not. R. Astron. Soc., 388, 697-708 (2008/August-1)

Lopsided galaxies: the case of NGC 891.

MAPELLI M., MOORE B. and BLAND-HAWTHORN J.

Abstract (from CDS):

It has been known for a long time that a large fraction of disc galaxies are lopsided. We simulate three different mechanisms that can induce lopsidedness: flyby interactions, gas accretion from cosmological filaments and ram pressure from the intergalactic medium. Comparing the morphologies, HI spectrum, kinematics and m = 1 Fourier components, we find that all of these mechanisms can induce lopsidedness in galaxies, although in different degrees and with observable consequences. The time-scale over which lopsidedness persists suggests that flybys can contribute to ∼20 per cent of lopsided galaxies. We focus our detailed comparison on the case of NGC 891, a lopsided, edge-on galaxy with a nearby companion (UGC 1807). We find that the main properties of NGC 891 (morphology, HI spectrum, rotation curve, existence of a gaseous filament pointing towards UGC 1807) favour a flyby event for the origin of lopsidedness in this galaxy.

Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): methods: {em N}-body simulations - galaxies: individual: NGC 891 - galaxies: interactions - galaxies: kinematics and dynamics

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 UGC 731 AG? 01 10 43.98 +49 36 07.9   17       ~ 103 0
3 MCG+07-05-040 AG? 02 21 13.40 +42 45 45.7   11.26   14.38   ~ 46 0
4 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
5 NGC 1637 Sy2 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 444 0
6 NGC 2985 Sy2 09 50 22.233 +72 16 43.13   11.37 10.61     ~ 269 1
7 NGC 3027 AG? 09 55 40.631 +72 12 12.84   12.3       ~ 121 0
8 M 61 Sy2 12 21 54.9282582888 +04 28 25.597367184 10.07 10.18 9.65     ~ 1084 1
9 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1286 1
10 NGC 5006 EmG 13 11 45.7713514368 -19 15 42.466312620   13.33   11.89   ~ 42 0
11 NGC 5324 GiG 13 52 05.9053842768 -06 03 29.757803652   12.5   11.62 12.3 ~ 64 0
12 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
13 NGC 7421 EmG 22 56 54.3533970816 -37 20 50.437978152 12.61 12.64 11.93 11.71 12.1 ~ 127 1
14 NAME Local Group GrG ~ ~           ~ 9325 0

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