2018MNRAS.474.1108L

Query : 2018MNRAS.474.1108L

2018MNRAS.474.1108L - Mon. Not. R. Astron. Soc., 474, 1108-1115 (2018)

Tidal origin of NGC 1427A in the Fornax cluster.

LEE-WADDELL K., SERRA P., KORIBALSKI B., VENHOLA A., IODICE E., CATINELLA B., CORTESE L., PELETIER R., POPPING A., KEENAN O. and CAPACCIOLI M.

Abstract (from CDS):

We present new HI observations from the Australia Telescope Compact Array and deep optical imaging from OmegaCam on the VLT Survey Telescope of NGC 1427A, an arrow-shaped dwarf irregular galaxy located in the Fornax cluster. The data reveal a star-less HI tail that contains ∼10 per cent of the atomic gas of NGC 1427A as well as extended stellar emission that shed new light on the recent history of this galaxy. Rather than being the result of ram pressure induced star formation, as previously suggested in the literature, the disturbed optical appearance of NGC 1427A has tidal origins. The galaxy itself likely consists of two individual objects in an advanced stage of merging. The HI tail may be made of gas expelled to large radii during the same tidal interaction. It is possible that some of this gas is subject to ram pressure, which would be considered a secondary effect and implies a north-west trajectory of NGC 1427A within the Fornax cluster.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: individual: NGC 1427A - galaxies: interactions

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 QSO B0332-403 BLL 03 34 13.65448823 -40 08 25.3979928 18.54 18.35 17.87 17.5   ~ 349 1
2 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
3 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
4 NGC 1404 rG 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 787 1
5 NGC 1427A GiP 03 40 08.6854 -35 37 34.647   13.44   12.68 13.3 ~ 127 1
6 MCG-06-09-019 EmG 03 41 32.607 -34 53 18.01   13.95   13.02 13.8 ~ 106 0
7 NGC 1427 GiG 03 42 19.4455150392 -35 23 33.169251120   11.89   10.44   ~ 298 0
8 HIPASS J0342-36 EmG 03 42 52.5 -36 17 15           ~ 5 0
9 NGC 1437A GiG 03 43 02.19 -36 16 24.1   13.92   13.09   ~ 87 0
10 NGC 1436 GiG 03 43 37.0896438888 -35 51 11.004592644   12.49   11.16   ~ 143 0
11 ESO 358-60 GiC 03 45 12.14 -35 34 15.3   15.86   15.46 16.6 ~ 82 0
12 ESO 137-1 AG? 16 13 27.305 -60 45 50.59   14.84   13.87   ~ 132 0
13 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 340 2
14 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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