2018MNRAS.480..210L

Query : 2018MNRAS.480..210L

2018MNRAS.480..210L - Mon. Not. R. Astron. Soc., 480, 210-222 (2018/October-2)

The disc-averaged star formation relation for Local Volume dwarf galaxies.

LOPEZ-SANCHEZ A.R., LAGOS C.D.P., YOUNG T. and JERJEN H.

Abstract (from CDS):

Spatially resolved H I studies of dwarf galaxies have provided a wealth of precision data. However these high-quality, resolved observations are only possible for handful of dwarf galaxies in the Local Volume. Future H I surveys are unlikely to improve the current situation. We therefore explore a method for estimating the surface density of the atomic gas from global H I parameters that are conversely widely available. We perform empirical tests using galaxies with resolved H I maps, and find that our approximation produces values for the surface density of atomic hydrogen within typically 0.5 dex of the true value. We apply this method to a sample of 147 galaxies drawn from modern near-infrared stellar photometric surveys. With this sample we confirm a strict correlation between the atomic gas surface density and the star formation rate surface density, which is vertically offset from the Kennicutt-Schmidt relation by a factor of 10-30, and significantly steeper than the classical N = 1.4 of Kennicutt (1998). We further infer the molecular fraction in the sample of low surface brightness, predominantly dwarf galaxies by assuming that the star formation relationship with molecular gas observed for spiral galaxies also holds in these galaxies, finding a molecular-to-atomic gas mass fraction within the range of 5-15 per cent. Comparison of the data to available models shows that a model in which the thermal pressure balances the vertical gravitational field captures better the shape of the ΣSFR-Σgas relationship. However, such models fail to reproduce the data completely, suggesting that thermal pressure plays an important role in the discs of dwarf galaxies.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: irregular - galaxies: star formation - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/480/210): table1.dat table2.dat>

Simbad objects: 126

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Number of rows : 126
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 ESO 349-31 AG? 00 08 13.1536 -34 34 47.836   15.54   14.99   ~ 156 3
3 ESO 410-5 LSB 00 15 31.21 -32 10 49.9   15.32 14.9 14.58   ~ 120 1
4 ESO 294-10 AG? 00 26 33.37 -41 51 19.1   15.76 15.3 14.97   ~ 122 2
5 ESO 473-24 AG? 00 31 22.51 -22 45 57.5   16.11   15.87 17.7 ~ 62 1
6 IC 1574 AG? 00 43 03.82 -22 14 48.8 15.25 14.73 14.35 14.24 14.2 ~ 137 1
7 ESO 540-30 AG? 00 49 20.96 -18 04 31.5   16.45   15.33   ~ 92 1
8 MCG-04-03-019 G 00 49 49.3 -21 00 58 16.11 15.64 15.36 14.8 15.5 ~ 144 1
9 ESO 540-32 LSB 00 50 24.5 -19 54 23 17.44 16.54 16.01 15.70   ~ 79 1
10 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
11 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 526 0
12 Z 458-20 AG? 01 07 23.0321 +16 41 00.988 15.01 14.55 14.07     ~ 148 0
13 LEDA 166061 AG? 01 08 21.93 -38 12 34.5           ~ 31 0
14 NGC 625 AGN 01 35 04.632 -41 26 10.32 12.37 11.78 11.25 11.03 11.5 ~ 312 2
15 MCG-07-04-032 AG? 01 45 03.74 -43 35 52.9 13.45 12.92 12.63 12.51 12.8 ~ 152 1
16 LEDA 166065 LSB 02 00 10.2 +28 49 53   17.2       ~ 67 0
17 ESO 115-21 G 02 37 49.563 -61 19 53.77 14.14 13.52 13.13 12.95   ~ 100 1
18 ESO 154-23 AG? 02 56 50.38 -54 34 17.1   12.63   12.18 12.5 ~ 123 0
19 ESO 199-7 AG? 02 58 04.18 -49 22 59.0   16.44   16.00 16.4 ~ 29 0
20 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
21 NGC 1311 Sy2 03 20 06.946 -52 11 07.76 13.89 13.35 12.93 12.75 13.1 ~ 136 0
22 LEDA 305802 G 03 20 36.5 -66 18 40           ~ 8 0
23 IC 1959 GiG 03 33 12.576 -50 24 51.13 13.52 13.32 12.96 12.75 12.7 ~ 119 0
24 LEDA 13216 EmG 03 34 15.34 -61 05 47.7   16.38   15.9 15.5 ~ 18 0
25 IC 2038 GiP 04 08 53.7569973144 -55 59 21.778144080   14.82   13.80   ~ 43 0
26 IC 2039 GiP 04 09 02.3235506064 -56 00 41.646005964   14.97   13.91   ~ 35 0
27 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
28 UGCA 92 AG? 04 32 03.8366 +63 36 51.243   16.15       ~ 128 0
29 NAME Cam B G 04 53 07.1 +67 05 57   16.71       ~ 79 0
30 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
31 ESO 252-1 IG 04 56 58.3 -42 48 03   15.28   15.04   ~ 53 0
32 NGC 1744 LSB 04 59 57.7383643080 -26 01 19.840639764 12.43 11.90 11.41 11.20 11.7 ~ 159 0
33 6dFGS gJ052323.7-343430 EmG 05 23 23.72 -34 34 29.5   17.20   15.67   ~ 19 0
34 LEDA 17965 AG? 05 50 17.710 -10 17 51.61   18.17   15.00   ~ 26 0
35 ESO 364-29 G 06 05 44.0 -33 05 00   13.60   13.23 13.2 ~ 48 0
36 NGC 2188 EmG 06 10 09.8934 -34 06 14.168   12.10 11.82 11.39   ~ 115 0
37 ESO 121-20 AG? 06 15 54.19 -57 43 31.7   15.85   15.49 15.6 ~ 63 1
38 ESO 489-56 AG? 06 26 17.4435 -26 16 01.290   16.69   16.28 15.0 ~ 60 0
39 ESO 308-22 AG? 06 39 32.7727 -40 43 05.254   16.23   15.88 16.9 ~ 35 0
40 LEDA 76040 AG? 06 46 56.634 -17 56 27.11   16.0   15.4 15.1 ~ 26 0
41 NAME Argo Dwarf Irregular G 07 05 17.4 -58 31 13   14.2       ~ 53 0
42 Z 57-6 AG? 07 13 51.60 +10 31 19.0   14.9       ~ 105 0
43 ESO 59-1 AG? 07 31 18.20 -68 11 16.8   13.74   12.80 13.7 ~ 81 1
44 LEDA 21406 AG? 07 37 10.9090 -69 20 14.727           ~ 13 0
45 MCG+07-16-011 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 125 0
46 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
47 Z 87-33 AG? 07 42 31.794 +16 33 36.69   15.6       ~ 22 0
48 Z 88-7 G 07 57 01.027 +14 23 47.66   16.0       ~ 161 0
49 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
50 ESO 6-1 AG? 08 19 22.1394597504 -85 08 35.693588832   15.16   13.94   ~ 25 0
51 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
52 MCG-04-22-003 AG? 09 09 46.54 -23 00 33.0   15.64 14.44 14.74 13.76 ~ 40 0
53 NGC 2784 EmG 09 12 19.497 -24 10 21.36 12.02 10.99 10.16 9.30   ~ 144 1
54 LEDA 166099 G 09 12 29.3 -24 14 28   16.35 15.27   14.45 ~ 19 1
55 ESO 564-30 AG? 09 13 12.8372 -19 24 31.980   14.91   14.13 15.0 ~ 32 0
56 NGC 2835 EmG 09 17 52.8523921416 -22 21 16.839119700   11.03   10.32 10.9 ~ 285 0
57 MCG-04-22-009 AG? 09 21 27.7213 -22 30 00.894   14.87   13.87 15.6 ~ 46 0
58 ESO 565-3 AG? 09 23 10.00 -20 10 03.2   15.53   14.64   ~ 20 0
59 NGC 2915 AG? 09 26 11.532 -76 37 34.75 13.13 12.93 12.68 11.90 12.8 ~ 371 2
60 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
61 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
62 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1067 2
63 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
64 ESO 376-16 AG? 10 43 27.06 -37 02 33.4   15.44   14.64 15.1 ~ 29 0
65 ESO 318-13 AG? 10 47 41.60 -38 51 13.2   15.02   13.96   ~ 45 0
66 ESO 215-9 AG? 10 57 29.90 -48 10 43.0   16.03   15.02 15.0 ~ 79 0
67 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
68 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
69 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
70 ESO 320-14 AG? 11 37 53.24 -39 13 13.2   15.85   15.17 16.0 ~ 48 0
71 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
72 ESO 379-7 AG? 11 54 43.49 -33 33 36.0   16.60   15.50 15.3 ~ 61 0
73 ESO 379-24 AG? 12 04 57.1010 -35 44 29.693   16.58   15.92 15.8 ~ 27 0
74 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
75 ESO 321-14 AG? 12 13 48.8792 -38 14 00.250 16.32 15.70 15.35 15.20 15.2 ~ 92 0
76 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
77 IC 3104 AG? 12 18 46.06 -79 43 33.9   13.65 12.8 12.04   ~ 93 1
78 Z 187-47 GiG 12 28 38.743 +35 43 02.91 15.50 15.12 14.86 14.78   ~ 130 1
79 ESO 381-18 EmG 12 44 42.39 -35 58 00.2   15.79   14.84 15.1 ~ 59 0
80 MCG-06-28-017 AG? 12 46 00.67 -33 50 13.0   14.24   13.50 14.0 ~ 91 0
81 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
82 LEDA 166152 AG? 13 05 02.8154 -40 04 58.706   16.0   16.2 16.0 ~ 64 0
83 ESO 269-58 AG? 13 10 32.8047 -46 59 37.747   12.50   11.31   ~ 76 0
84 MCG+08-24-090 AG? 13 13 22.839 +46 19 21.71   17       ~ 135 1
85 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
86 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 274 0
87 LEDA 46885 GiC 13 24 36.23 -30 58 18.5   16.67   17.33   ~ 61 1
88 IC 4247 EmG 13 26 44.43 -30 21 44.7 15.34 14.67 14.28 14.13 14.53 ~ 99 0
89 ESO 324-24 LSB 13 27 37.6117 -41 28 44.128   12.91   12.13 12.3 ~ 107 0
90 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
91 ESO 444-78 GiC 13 36 30.7829 -29 14 10.181   15.49   14.81 15.0 ~ 97 0
92 ESO 444-84 GiC 13 37 19.99 -28 02 42.0 16.04 15.34 15.05 15.05 14.9 ~ 133 1
93 Z 218-34 AG? 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 165 0
94 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
95 IC 4316 EmG 13 40 18.41 -28 53 32.0   15.02 15.93 14.15   ~ 89 0
96 NGC 5264 GiG 13 41 36.683 -29 54 47.25 13.86 12.96 12.39 12.14 15.83 ~ 164 1
97 ESO 325-11 AG? 13 45 01.0528 -41 51 45.993   14.02   13.49 12.9 ~ 113 0
98 LEDA 2807150 LSB 13 54 33.356 +04 14 39.66   16.8 17.1     ~ 89 0
99 MCG+06-31-023 AG? 13 54 48.8114 +35 50 07.775   16.5   15.20   ~ 123 1
100 ESO 384-16 AG? 13 57 01.37 -35 19 58.7   14.80   14.10 14.81 ~ 62 0
101 NGC 5408 EmG 14 03 20.907 -41 22 39.75   12.59   11.96 12.2 ~ 368 3
102 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 94 0
103 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
104 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
105 ESO 222-10 AG? 14 35 02.58 -49 25 14.3   14.8   14.6 14.7 ~ 36 0
106 ESO 272-25 AG? 14 43 25.52 -44 42 18.9   14.79   14.00 13.8 ~ 40 0
107 ESO 223-9 AG? 15 01 08.67 -48 17 25.7   12.3   12.5 12.6 ~ 81 0
108 ESO 274-1 G 15 14 13.429 -46 48 33.12   12.00   10.97 11.3 ~ 118 0
109 ESO 137-18 GiG 16 20 58.352 -60 29 27.48   12.23   11.03 11.9 ~ 74 0
110 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
111 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
112 ESO 461-36 G 20 03 57.4 -31 40 53   17.06   16.2 16.1 ~ 73 1
113 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
114 IC 5052 G 20 52 01.633 -69 11 35.93 12.83 12.20 11.66 11.40   ~ 169 0
115 IC 5152 rG 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 273 1
116 ESO 468-20 G 22 40 43.6 -30 47 55   15.88   15.13   ~ 45 0
117 MCG-05-55-012 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 163 0
118 MCG-06-51-005 GiG 23 26 56.21 -37 20 48.9 14.90 14.69 14.35 14.19 14.2 ~ 74 0
119 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
120 IC 5332 GiG 23 34 27.488 -36 06 03.89 11.59 11.27 10.72 10.50 11.2 ~ 216 0
121 NGC 7713 EmG 23 36 15.154 -37 56 22.18   11.63   11.09 11.6 ~ 151 1
122 MCG-05-56-001 G 23 43 45.549 -31 57 24.37 14.55 14.03 13.73 13.63   ~ 162 1
123 LEDA 2807157 GiG 23 45 35.177 +38 43 05.09   16.7 15.2     ~ 93 1
124 ESO 348-9 AG? 23 49 23.4984 -37 46 25.536   14.6   14.7 14.4 ~ 60 0
125 ESO 149-3 AG? 23 52 02.15 -52 34 33.9 15.48 15.10 14.89 14.84 14.9 ~ 88 0
126 NGC 7793 GiG 23 57 49.7540045856 -32 35 27.701550744 10.26 9.74 9.28 9.06 9.7 ~ 1188 2

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