Query : 2019A&A...628A..58S

2019A&A...628A..58S - Astronomy and Astrophysics, volume 628A, 58-58 (2019/8-1)

Flaring stellar disk in the low surface brightness galaxy UGC 7321.


Abstract (from CDS):

We theoretically study the vertical structure of the edge-on low surface brightness (LSB) galaxy UGC 7321. This is one of the few well-observed LSBs. We modeled it as a gravitationally coupled disk system of stars and atomic hydrogen gas in the potential of the dark matter halo and treated the realistic case where the rotation velocity varies with radius. We used a dense and compact halo as implied by the observed rotation curve in this model. We calculated the thickness of stellar and HI disks in terms of the half-width at half-maximum of the vertical density distribution in a region of R=0-12kpc using input parameters constrained by observations. We obtain a mildly increasing disk thickness up to R=6kpc, in a good agreement with the observed trend, and predict a strong flaring beyond this. To obtain this trend, the stellar velocity dispersion has to fall exponentially at a rate of 3.2RD, while the standard value of 2RD gives a decreasing thickness with radius. Interestingly, both stellar and HI disks show flaring in the outer disk region although they are dynamically dominated by the dark matter halo from the very inner radii. The resulting vertical stellar density distribution cannot be fit by a single sech2/n function, in agreement with observations, which show wings at larger distances above the mid-plane. Invoking a double-disk model to explain the vertical structure of LSBs as done in the literature may therefore not be necessary.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: halos - galaxies: ISM - galaxies: individual: UGC 7321 - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure

Errata: erratum vol. 652, art. C1 (2021)

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1671 2
2 UGC 7321 EmG 12 17 34.021 +22 32 23.35   14.07   13.21   ~ 264 0
3 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 959 0
4 UGC 8146 AG? 13 02 08.046 +58 42 02.04   14.6       ~ 79 0

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