2006MNRAS.369.1849A


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.20CET01:47:15

2006MNRAS.369.1849A - Mon. Not. R. Astron. Soc., 369, 1849-1857 (2006/July-2)

Origin of disc lopsidedness in the Eridanus group of galaxies.

ANGIRAS R.A., JOG C.J., OMAR A. and DWARAKANATH K.S.

Abstract (from CDS):

The HI surface density maps for a sample of 18 galaxies in the Eridanus group are Fourier analysed. This analysis gives the radial variation of the lopsidedness in the HI spatial distribution. The lopsidedness is quantified by the Fourier amplitude A1of the m = 1 component normalized to the average value. It is also shown that in the radial region where the stellar disc and HI overlap, their A1coefficients are comparable. All the galaxies studied show significant lopsidedness in Hi. The mean value of A1in the inner regions of the galaxies (1.5-2.5 scalelengths) is ≥ 0.2. This value of A1is twice the average value seen in the field galaxies. Also, the lopsidedness is found to be smaller for late-type galaxies; this is opposite to the trend seen in the field galaxies. These two results indicate a different physical origin for disc lopsidedness in galaxies in a group environment compared to the field galaxies. Further, a large fraction (∼30 per cent) shows a higher degree of lopsidedness (A1≥ 0.3). It is also seen that the disc lopsidedness increases with the radius as demonstrated in earlier studies, but over a radial range that is two times larger than done in the previous studies. The average lopsidedness of the halo potential is estimated to be ∼10 per cent, assuming that the lopsidedness in HI disc is due to its response to the halo asymmetry.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): galaxies: evolution - galaxies: ISM - galaxies: spiral - galaxies: structure

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Eridanus ClG GrG 00 30 00 -21 30.0           ~ 142 0
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1497 2
3 NGC 1285 G 03 17 53.414 -07 17 51.78   13.3   12.60 13.2 ~ 40 1
4 NGC 1309 GiG 03 22 06.5558186281 -15 23 59.793798444   12.08   12.5 11.7 ~ 177 0
5 ESO 548-5 GiG 03 23 47.25 -19 45 10.2   13.70   13.14 13.7 ~ 35 0
6 NGC 1325 GiP 03 24 25.5763209528 -21 32 38.606979499   12.28 11.55 11.13 11.6 ~ 150 0
7 NGC 1345 EmG 03 29 31.694 -17 46 42.04   13.67   12.96 13.6 ~ 83 0
8 NGC 1347 IG 03 29 41.8 -22 16 44   13.74   12.97   ~ 42 0
9 ESO 548-32 LSB 03 32 19.17 -17 43 04.6   14.84   14.09 14.6 ~ 42 0
10 IC 1953 GiG 03 33 41.885 -21 28 43.03   12.41   12.3 12.1 ~ 101 0
11 NGC 1359 GiP 03 33 47.698 -19 29 31.01   12.61   12.25 13.1 ~ 77 0
12 NGC 1367 GiG 03 35 01.351 -24 55 59.19   11.48   9.98 11.1 ~ 166 0
13 ESO 548-49 G 03 35 28.07 -21 13 01.3   15.35   14.75   ~ 14 0
14 ESO 482-13 GiG 03 36 53.694 -24 54 47.07   15.17   14.20 14.8 ~ 30 0
15 NGC 1390 GiG 03 37 52.160 -19 00 30.07   14.63   13.31 14.0 ~ 44 0
16 NGC 1414 GiP 03 40 57.135 -21 42 50.07   14.65   13.88   ~ 46 0
17 ESO 482-35 GiG 03 41 14.649 -23 50 20.09   13.69   12.46   ~ 54 0
18 NGC 1422 GiP 03 41 31.064 -21 40 53.38   13.99   12.93   ~ 65 0
19 MCG-03-10-041 EmG 03 43 35.5075823957 -16 00 52.075688553   14.40   13.8 13.8 ~ 31 0
20 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1369 1
21 ESO 549-35 GiP 03 55 03.95 -20 23 00.6   15.46   14.45 16.4 ~ 36 0
22 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 969 1
23 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2489 2

    Equat.    Gal    SGal    Ecl

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2020.01.20-01:47:15

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