2020MNRAS.495.2867P

Query : 2020MNRAS.495.2867P

2020MNRAS.495.2867P - Mon. Not. R. Astron. Soc., 495, 2867-2881 (2020/July-1)

H I scale height in dwarf galaxies.

PATRA N.N.

Abstract (from CDS):

Assuming a vertical hydrostatic equilibrium in the baryonic discs, joint Poisson-Boltzmann equation was set up and solved numerically in a sample of 23 nearby dwarf galaxies from the LITTLE-THINGS survey. This is the largest sample to date for which detailed hydrostatic modelling is performed. The solutions of the Poisson-Boltzmann equation provide a complete three-dimensional distribution of the atomic hydrogen (H I) in these galaxies. Using these solutions, we estimate the vertical scale height (defined as the half width at half maxima of the density distribution) of the H I as a function of radius. We find that the scale height in our sample galaxies varies between a few hundred parsec at the centre to a few kiloparsec at the edge. These values are significantly higher than what is observed in spiral galaxies. We further estimate the axial ratios to investigate the thickness of the H I discs in dwarf galaxies. For our sample galaxies, we find a median axial ratio to be 0.40, which is much higher than the same observed in the Milky Way. This indicates that the vertical hydrostatic equilibrium results in thicker H I discs in dwarf galaxies naturally.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): atomic data - galaxies: dwarf - galaxies: kinematics and dynamics - galaxies: structure - radio lines: ISM

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
3 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
4 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
5 Z 206-10 AG? 07 28 17.724 +40 46 11.36   15.50       ~ 155 0
6 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
7 MCG+07-16-011 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 125 0
8 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
9 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
10 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
11 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
12 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 108 0
13 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
14 MCG+11-13-039 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 170 0
15 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
16 Z 157-55 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 138 0
17 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
18 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
19 Z 159-13 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 180 0
20 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
21 Z 270-22 bCG 12 46 56.426 +51 36 46.80   14.1       ~ 119 0
22 NGC 4789A GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 614 1
23 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
24 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
25 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
26 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1

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