2002A&A...389..825V


Query : 2002A&A...389..825V

2002A&A...389..825V - Astronomy and Astrophysics, volume 389, 825-835 (2002/7-3)

Star formation in the warped outer pseudoring of the spiral galaxy NGC 3642.

VERDES-MONTENEGRO L., BOSMA A. and ATHANASSOULA E.

Abstract (from CDS):

NGC 3642 was classified as a spiral galaxy with three rings and no bar. We have performed an HI and optical study of this nearly face-on galaxy. We find that the nuclear ring might in fact be part of an inner one-armed spiral, that could be driving nuclear accretion and feeding the central activity in the inner kpc. The inner ring is faint, and the outer ring is a rather ill-defined pseudoring. Furthermore, the size ratio of the rings is such that they cannot be due to a single pattern speed linking them together. The outer pseudoring is peculiar, since it lies in the faint outer parts of the disk, where star formation is still going on at 1.4 times the optical radius. Higher HI column densities are associated with these regions and the atomic gas layer is warped. These perturbations affect only the outer disk, since the kinematics within the main body conforms well to an ordinary differentially rotating disk. We propose here that both nuclear activity and star formation in the warped outer parts might be linked to the fact that NGC 3642 is located in a rich environment, where its close neighbors show clear signs of merging. Our suggestion is that NGC 3642 has captured recently a low-mass, gas-rich dwarf, and star formation was triggered in this infalling external gas that produced also a pronounced warp in the gaseous disk.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 3642 - galaxies: kinematics - galaxies: photometry - galaxies: spiral - galaxies: structure

Simbad objects: 8

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Number of rows : 8
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 3610 GiG 11 18 25.276 +58 47 10.49   11.4       ~ 287 0
2 NGC 3613 GiG 11 18 36.130 +57 59 59.73   11.6       ~ 194 0
3 NGC 3619 GiG 11 19 21.621 +57 45 27.66   12.6       ~ 154 0
4 NGC 3642 LIN 11 22 17.89416 +59 04 28.2648   14.86 14.04     ~ 193 0
5 NGC 3674 GiG 11 26 26.6127569213 +57 02 54.068612346   13.1       ~ 67 0
6 NGC 3683 H2G 11 27 31.890 +56 52 36.15   12.7       ~ 171 0
7 UGC 6484 GiG 11 29 11.7658874352 +57 07 56.358316800   12.6       ~ 65 0
8 NAME Local Group GrG ~ ~           ~ 7313 0

    Equat.    Gal    SGal    Ecl

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2021.07.26-00:56:04

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