2021AJ....161..175H


Query : 2021AJ....161..175H

2021AJ....161..175H - Astron. J., 161, 175-175 (2021/April-0)

A search for correlations between turbulence and star formation in LITTLE THINGS dwarf irregular galaxies.

HUNTER D.A., ELMEGREEN B.G., ARCHER H., SIMPSON C.E. and CIGAN P.

Abstract (from CDS):

Turbulence has the potential for creating gas density enhancements that initiate cloud and star formation (SF), and it can be generated locally by SF. To study the connection between turbulence and SF, we looked for relationships between SF traced by FUV images, and gas turbulence traced by kinetic energy density (KED) and velocity dispersion (vdisp) in the LITTLE THINGS sample of nearby dIrr galaxies. We performed 2D cross-correlations between FUV and KED images, measured cross-correlations in annuli to produce correlation coefficients as a function of radius, and determined the cumulative distribution function of the cross-correlation value. We also plotted on a pixel-by-pixel basis the locally excess KED, vdisp, and H I mass surface density, ΣHI, as determined from the respective values with the radial profiles subtracted, versus the excess SF rate density ΣSFR, for all regions with positive excess ΣSFR. We found that ΣSFR and KED are poorly correlated. The excess KED associated with SF implies a ∼0.5% efficiency for supernova energy to pump local H I turbulence on the scale of the resolution here, which is a factor of ∼2 too small for all of the turbulence on a galactic scale. The excess vdisp in SF regions is also small, only ∼0.37 km s–1. The local excess in ΣHI corresponding to an excess in ΣSFR is consistent with a H I consumption time of ∼1.6 Gyr in the inner parts of the galaxies. The similarity between this timescale and the consumption time for CO implies that CO-dark molecular gas has comparable mass to H I in the inner disks.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf irregular galaxies

Simbad objects: 42

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Number of rows : 42
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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 603 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1039 0
3 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 368 0
4 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1140 2
5 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1180 3
6 UGC 3860 G 07 28 17.724 +40 46 11.36   15.50       ~ 139 0
7 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 717 0
8 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1654 1
9 UGC 3966 G 07 41 25.777 +40 06 46.05   16.0       ~ 106 0
10 UGC 3974 G 07 41 56.3061361330 +16 48 07.439323443   15.4       ~ 210 0
11 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 715 2
12 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 193 1
13 UGC 4426 G 08 28 28.560 +41 51 27.13   18       ~ 140 0
14 UGC 4459 GiG 08 34 07.29 +66 10 54.6 15.39 15.03 14.70 14.49   ~ 305 2
15 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 83 0
16 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 333 1
17 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 563 0
18 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 485 0
19 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 674 2
20 UGC 5918 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 135 0
21 UGC 6456 bCG 11 28 00.43 +78 59 38.4   14.50       ~ 315 1
22 Mrk 178 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 218 1
23 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 260 0
24 UGC 6900 G 11 55 39.7065939676 +31 31 06.530347793   15.7       ~ 105 0
25 NGC 4163 LSB 12 12 09.108 +36 10 03.13 14.33 13.70 13.2 12.98   ~ 194 0
26 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 887 1
27 Mrk 209 bCG 12 26 16.02 +48 29 36.6   15.3       ~ 315 0
28 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 181 0
29 UGC 7698 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 146 0
30 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 206 0
31 UGC 7950 bCG 12 46 56.426 +51 36 46.80   14.1       ~ 99 0
32 M 94 SyG 12 50 53.148 +41 07 12.55 9.15 8.96 8.24 7.78   ~ 1268 2
33 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 551 1
34 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 446 0
35 UGC 8201 G 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 229 1
36 UGC 8308 G 13 13 22.839 +46 19 21.71   17       ~ 121 1
37 UGC 8320 G 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 247 0
38 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 172 0
39 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 260 0
40 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 286 1
41 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 408 1
42 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 433 1

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2021.09.21-07:09:40

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