2012ApJ...746...10K


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST21:41:43

2012ApJ...746...10K - Astrophys. J., 746, 10 (2012/February-2)

Interaction between dark matter sub-halos and a galactic gaseous disk.

KANNAN R., MACCIO A.V., PASQUALI A., MOSTER B.P. and WALTER F.

Abstract (from CDS):

We investigate the idea that the interaction of dark matter (DM) sub-halos with the gaseous disks of galaxies can be the origin for the observed holes and shells found in their neutral hydrogen (H I) distributions. We use high-resolution hydrodynamic simulations to show that pure DM sub-halos impacting a galactic disk are not able to produce holes; on the contrary, they result in high-density regions in the disk. However, sub-halos containing a small amount of gas (a few percent of the total DM mass of the sub-halo) are able to displace the gas in the disk and form holes and shells. The sizes and lifetimes of these holes depend on the sub-halo gas mass, density, and impact velocity. A DM sub-halo, of mass 108 M and a gas mass fraction of ∼3%, is able to create a kiloparsec-scale hole with a lifetime similar to those observed in nearby galaxies. We also register an increase in the star formation rate at the rim of the hole, again in agreement with observations. Even though the properties of these simulated structures resemble those found in observations, we find that the number of predicted holes (based on mass and orbital distributions of DM halos derived from cosmological N-body simulations) falls short compared to the observations. Only a handful of holes are produced per gigayear. This leads us to conclude that DM halo impact is not the major channel through which these holes are formed.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: structure - ISM: bubbles - ISM: 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 - 2021
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1033 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11310 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9793 1
4 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1132 2
5 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5292 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15356 1
7 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 712 2
8 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 192 1
9 IC 2475 G 09 27 54.3265464527 +29 47 30.560161344   15.7       ~ 13 0
10 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 331 1
11 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 668 2
12 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 617 1
13 UGC 5889 GiP 10 47 22.401 +14 04 16.74 14.17 14.31 13.61 13.51   ~ 125 1
14 UGC 8201 G 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 228 1
15 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 171 0
16 UGC 8651 G 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 138 0
17 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2621 2
18 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2047 0
19 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 600 0
20 NGC 6705 OpC 18 51 05 -06 16.2   6.32 5.8     ~ 366 0
21 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2307 2

    Equat.    Gal    SGal    Ecl

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2021.05.15-21:41:43

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