2000A&A...358..845J


Query : 2000A&A...358..845J

2000A&A...358..845J - Astronomy and Astrophysics, volume 358, 845-849 (2000/6-3)

IC 3328: A ``dwarf elliptical galaxy'' with spiral structure.

JERJEN H., KALNAJS A. and BINGGELI B.

Abstract (from CDS):

We present the 2-D photometric decomposition of the Virgo galaxy IC 3328. The analysis of the global light distribution of this morphologically classified nucleated dwarf elliptical galaxy (dE1,N) reveals a tightly wound, bi-symmetric spiral structure with a diameter of 4.5kpc, precisely centered on the nucleus of the dwarf. The amplitude of the spiral is only three percent of the dwarf's surface brightness making it the faintest and smallest spiral ever found in a galaxy. In terms of pitch angle and arm winding the spiral is similar to the intermediate-type galaxy M51, but it lacks the dust and prominent HII regions which signal the presence of gas. The visual evidence of a spiral pattern in an early-type dwarf galaxy reopens the question on whether these dwarfs are genuine rotationally supported or anisotropic stellar systems. In the case of IC 3328, we argue for a nearly face-on disk (dS0) galaxy with an estimated maximum rotation velocity of vc,max≃55km/s. The faintness of the spiral and the small motions within it, suggests that we could be seeing swing-amplified noise. The other possibility is a tidal origin, caused by the near passage of a small companion.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: individual: IC 3328 - galaxies: interactions - galaxies: kinematics and dynamics - 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 - 2022
#notes
1 NGC 4325 BiC 12 23 06.662 +10 37 16.45   15.0       ~ 122 1
2 LEDA 1374571 GiG 12 25 04.1002751904 +10 06 04.171485096           ~ 10 0
3 NGC 4380 BLL 12 25 22.178 +10 01 00.14   13.4       ~ 244 0
4 LEDA 40587 LSB 12 25 47.30 +10 05 33.7           ~ 11 0
5 IC 3328 GiP 12 25 57.9238048368 +10 03 13.552350912   14.9       ~ 151 0
6 LEDA 40696 G 12 26 29.85 +09 58 44.1           ~ 4 0
7 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6249 0
8 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4061 4

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2022.05.23-10:39:54

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