2017ApJ...834L...4B

Query : 2017ApJ...834L...4B

2017ApJ...834L...4B - Astrophys. J., 834, L4-L4 (2017/January-1)

Angular momentum of dwarf galaxies.

BUTLER K.M., OBRESCHKOW D. and OH S.-H.

Abstract (from CDS):

We present measurements of baryonic mass Mb and specific angular momentum (sAM) jb in 14 rotating dwarf Irregular (dIrr) galaxies from the LITTLE THINGS sample. These measurements, based on 21 cm kinematic data from the Very Large Array and stellar mass maps from the Spitzer Space Telescope, extend previous AM measurements by more than two orders of magnitude in Mb. The dwarf galaxies show systematically higher jb values than expected from the jb∝Mb2/3 scaling of spiral galaxies, representative of a scale-free galaxy formation scenario. This offset can be explained by decreasing baryon mass fractions fM=Mb/Mdyn (where Mdyn is the dynamical mass) with decreasing Mb (for Mb 1011 M☉). We find that the sAM of neutral atomic hydrogen (H i) alone is about 2.5 times higher than that of the stars. The M-j relation of H i is significantly steeper than that of the stars, as a direct consequence of the systematic variation of the H i fraction with Mb.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

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

Simbad objects: 18

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Number of rows : 18
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 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
3 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
4 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
5 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
6 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
7 MCG+11-13-039 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 170 0
8 Z 157-55 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 138 0
9 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
10 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
11 Z 159-13 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 180 0
12 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
13 NGC 4789A GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 614 1
14 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
15 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
16 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
17 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
18 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1

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