2002A&A...390L..35N


Query : 2002A&A...390L..35N

2002A&A...390L..35N - Astronomy and Astrophysics, volume 390, L35-38 (2002/8-2)

Origin of radially increasing stellar scaleheight in a galactic disk.

NARAYAN C.A. and JOG C.J.

Abstract (from CDS):

For the past twenty years, it has been accepted that the vertical scaleheight of the stellar disk in spiral galaxies is constant with radius. However, there is no clear physical explanation for this in the literature. Here we calculate the vertical stellar scaleheight for a self-gravitating stellar disk including the additional gravitational force of the HI and H2 gas and the dark matter halo. We apply our model to two edge-on galaxies, NGC 891 and NGC 4565, and find that the resulting scaleheight shows a linear increase of nearly a factor of two within the optical disk for both these galaxies. Interestingly, we show that the observed data when looked at closely, do not imply a constant scaleheight but actually support this moderate flaring in scaleheight.

Abstract Copyright:

Journal keyword(s): galaxies: fundamental parameters - galaxies: individual: NGC 891, NGC 4565 - galaxies: kinematics and dynamics - galaxies: photometry - galaxies: spiral - galaxies: structure

Simbad objects: 4

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Number of rows : 4
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 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1594 2
2 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 533 1
3 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 914 0
4 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 722 1

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2022.06.30-06:28:44

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