2021AJ....161...71H

Query : 2021AJ....161...71H

2021AJ....161...71H - Astron. J., 161, 71-71 (2021/February-0)

Relationships between the stellar, gaseous, and star formation disks in LITTLE THINGS dwarf irregular galaxies: indirect evidence for substantial fractions of dark molecular gas.

HUNTER D.A., ELMEGREEN B.G., GOLDBERGER E., TAYLOR H., ERMAKOV A.I., HERRMANN K.A., OH S.-H., MALKO B., BARANDI B. and JUNDT R.

Abstract (from CDS):

The stellar, gaseous and young stellar disks in the LITTLE THINGS sample of nearby dwarf irregular galaxies are fitted with functions to search for correlations between the parameters. We find that the H I radial profiles are generally flatter in the center and fall faster in the outer regions than the V-band profiles, while young stars are more centrally concentrated, especially if the H I is more centrally flat. This pattern suggests that the H I is turning into molecules in the center, and the molecular clouds are forming stars and FUV. A model that assumes the molecular surface density is proportional to the total gas surface density to a power of 1.5 or 2, in analogy with the Kennicutt-Schmidt relation, reproduces the relationship between the ratio of the visible to the H I scale length and the H I Sersic index. The molecular fraction is estimated as a function of radius for each galaxy by converting the FUV to a molecular surface density using conventional calibrations. The average molecular fraction inside 3RD is 23% ± 17%. However, the break in the stellar surface brightness profile has no unified tracer related to star formation.

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

Journal keyword(s): Dwarf irregular galaxies - Star formation - Interstellar medium

VizieR on-line data: <Available at CDS (J/AJ/161/71): table1.dat table2.dat table3.dat table4.dat table5.dat>

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Wolf-Lundmark-Melotte G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 691 2
2 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1119 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
4 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 387 0
5 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1236 2
6 NGC 783 GiG 02 01 06.6095353032 +31 52 56.750490588   12.84       ~ 77 1
7 MCG-01-06-070 LIN 02 13 15.7954116216 -07 39 42.788642796   13.87   12.89   ~ 43 1
8 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1241 3
9 UGC 3422 AG? 06 15 08.1110403792 +71 08 12.022507860   14.10       ~ 46 1
10 UGC 3860 AG? 07 28 17.724 +40 46 11.36   15.50       ~ 149 0
11 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 769 0
12 UGC 3966 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 120 0
13 UGC 3974 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 225 0
14 NGC 2500 GiG 08 01 53.1717201720 +50 44 13.602483780 11.98 12.20 11.62 11.34 10.85 ~ 200 2
15 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 769 2
16 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 203 1
17 UGC 4426 LSB 08 28 28.560 +41 51 27.13   18       ~ 161 0
18 UGC 4459 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 338 2
19 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 100 0
20 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 356 1
21 NAME Leo A G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 615 0
22 NAME Sextans B H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 528 0
23 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 727 2
24 UGC 5918 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 159 0
25 UGC 6456 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 335 1
26 Mrk 178 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 230 1
27 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 280 0
28 NGC 3840 EmG 11 43 58.9639501800 +20 04 37.309753452 14.87 14.89 13.84 13.58   ~ 122 1
29 UGC 6900 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 129 0
30 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 222 0
31 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 965 1
32 Mrk 209 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 346 0
33 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 205 0
34 UGC 7698 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 169 0
35 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 232 0
36 UGC 7950 bCG 12 46 56.426 +51 36 46.80   14.1       ~ 112 0
37 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 592 1
38 UGC 8091 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 463 0
39 UGC 8201 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 255 1
40 UGC 8308 AG? 13 13 22.839 +46 19 21.71   17       ~ 131 1
41 UGC 8320 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 282 0
42 UGC 8508 AG? 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 195 0
43 UGC 9128 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 283 0
44 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 307 1
45 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 445 1
46 NAME PegDIG G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 474 1

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