2003A&A...409..485P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST10:56:16

2003A&A...409..485P - Astronomy and Astrophysics, volume 409, 485-490 (2003/10-2)

Evidence for a large stellar bar in the Low Surface Brightness galaxy UGC 7321.

POHLEN M., BALCELLS M., LUETTICKE R. and DETTMAR R.-J.

Abstract (from CDS):

Late-type spiral galaxies are thought to be the dynamically simplest type of disk galaxy and our understanding of their properties plays a key role in galaxy formation and evolution scenarios. The low surface brightness (LSB) galaxy UGC 7321, a nearby, isolated, ``superthin'' edge-on galaxy, is an ideal object to study these purely disk-dominated bulge-less galaxies. Although late type spirals are believed to exhibit the simplest possible structure, even prior observations showed deviations from a pure single component exponential disk in the case of UGC 7321. We present for the first time photometric evidence for peanut-shaped outer isophotes from a deep optical (R-band) image of UGC 7321. Observations and dynamical modeling suggest that boxy/peanut-shaped (b/p) bulges in general form through the buckling instability in bars of the parent galaxy disks. Together with recent HI observations supporting the presence of a stellar bar in UGC 7321, this could be the earliest known case of the buckling process during the evolutionary life of a LSB galaxy, whereby material in the disk-bar has started to be pumped up above the disk, but a genuine bulge has not yet formed.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: structure - galaxies: fundamental parameters - galaxies: evolution - galaxies: peculiar - galaxies: individual: UGC 7321

Simbad objects: 5

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Number of rows : 5

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 NGC 128 GiG 00 29 15.047 +02 51 50.60   13.2       ~ 189 0
2 NGC 2424 LIN 07 40 39.318 +39 14 00.30   13.9       ~ 68 0
3 UGC 7321 EmG 12 17 34.021 +22 32 23.35   14.07   13.21   ~ 226 0
4 IC 4767 GiG 18 47 41.763 -63 24 20.45   14.67 12.96 13.00 12.41 ~ 73 0
5 HCG 87 CGG 20 48 11 -19 50.4           ~ 38 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-10:56:16

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