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


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.24CEST23:56:11

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

Status at CDS:  

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 - 2020
#notes
1 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 567 2
2 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1145 3
3 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 698 0
4 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 684 2
5 UGC 4426 G 08 28 28.560 +41 51 27.13   18       ~ 128 0
6 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 464 0
7 UGC 5918 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 122 0
8 UGC 6900 G 11 55 39.7065939676 +31 31 06.530347793   15.7       ~ 94 0
9 NGC 4163 LSB 12 12 09.108 +36 10 03.13 14.33 13.70 13.2 12.98   ~ 184 0
10 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 165 0
11 UGC 7698 GiC 12 32 53.771 +31 32 50.56   13.50   13.03   ~ 132 0
12 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 191 0
13 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 528 1
14 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 437 0
15 UGC 8320 G 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 232 0
16 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 161 0
17 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 392 1
18 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 417 1

    Equat.    Gal    SGal    Ecl

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2020.05.24-23:56:11

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