2017MNRAS.465L..49J


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST03:36:15

2017MNRAS.465L..49J - Mon. Not. R. Astron. Soc., 465, L49-L53 (2017/February-2)

A constant intrinsic thickness for dwarf irregular galaxies?

JOHNSON M.C., HUNTER D.A., KAMPHUIS P. and WANG J.

Abstract (from CDS):

We assess the intrinsic thickness parameter, qo, for a sample of dwarf irregular galaxies and compare to larger, more massive spiral galaxy systems. We use optical photometry to determine b/a (minor-to-major axial ratio), and we use the H I kinematic inclination angle to derive qo. We find that qo ranges from 0.1 to 0.8 for the dwarfs. We find a trend in qo with luminosity, indicating that fainter dwarfs are thicker than brighter ones, similar to previous studies. However, we also find a trend in qo with H I kinematic inclination, which indicates that either the radius at which we measure b/a may be too small, or, that the stellar and gas discs have different inclinations. Because we selected only those objects that have nearly identical morphological and kinematic position angles, we find the latter reason unlikely. We find a weak trend in qo with hz/RD (ratio of stellar scaleheight to scalelength), which points to b/a not fully representing the stellar disc distribution. We conclude that a constant qo may not be appropriate for dwarf irregulars.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: kinematics and dynamics - galaxies: structure - galaxies: structure

Simbad objects: 21

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Number of rows : 21

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 582 2
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2956 2
3 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1115 2
4 ESO 154-23 G 02 56 50.4 -54 34 17   12.63   12.18 12.5 ~ 97 0
5 NGC 1313 G 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 614 2
6 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1158 3
7 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 709 0
8 ESO 59-1 G 07 31 18.2 -68 11 16   13.74   12.80 13.7 ~ 61 1
9 UGC 3966 G 07 41 25.777 +40 06 46.05   16.0       ~ 104 0
10 UGC 3974 G 07 41 56.3061361330 +16 48 07.439323443   15.4       ~ 205 0
11 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 700 2
12 UGC 4426 G 08 28 28.560 +41 51 27.13   18       ~ 135 0
13 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 80 0
14 UGC 6900 G 11 55 39.7065939676 +31 31 06.530347793   15.7       ~ 99 0
15 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 173 0
16 UGC 7698 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 138 0
17 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 541 1
18 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1277 2
19 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 167 0
20 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 423 1
21 NAME Local Group GrG ~ ~           ~ 7074 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-03:36:15

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