2012ApJ...757...84W


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.14CEST11:01:34

2012ApJ...757...84W - Astrophys. J., 757, 84 (2012/September-3)

Tracing cold H I gas in nearby, low-mass galaxies.

WARREN S.R., SKILLMAN E.D., STILP A.M., DALCANTON J.J., OTT J., WALTER F., PETERSEN E.A., KORIBALSKI B. and WEST A.A.

Abstract (from CDS):

We analyze line-of-sight atomic hydrogen (H I) line profiles of 31 nearby, low-mass galaxies selected from the Very Large Array–ACS Nearby Galaxy Survey Treasury (VLA-ANGST) and The H I Nearby Galaxy Survey (THINGS) to trace regions containing cold (T ≲ 1400 K) H I from observations with a uniform linear scale of 200 pc/beam. Our galaxy sample spans four orders of magnitude in total H I mass and nine magnitudes in MB. We fit single and multiple component functions to each spectrum to isolate the cold, neutral medium given by a low-dispersion (<6 km/s) component of the spectrum. Most H I spectra are adequately fit by a single Gaussian with a dispersion of 8-12 km/s. Cold H I is found in 23 of 27 (∼85%) galaxies after a reduction of the sample size due to quality-control cuts. The cold H I contributes ∼20% of the total line-of-sight flux when found with warm H I. Spectra best fit by a single Gaussian, but dominated by cold H I emission (i.e., have velocity dispersions of <6 km/s), are found primarily beyond the optical radius of the host galaxy. The cold H I is typically found in localized regions and is generally not coincident with the very highest surface density peaks of the global H I distribution (which are usually areas of recent star formation). We find a lower limit for the mass fraction of cold-to-total H I gas of only a few percent in each galaxy.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: ISM - ISM: atoms - ISM: clouds - ISM: structure - radio lines: ISM

Simbad objects: 35

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Number of rows : 35

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 NGC 247 LSB 00 47 08.554 -20 45 37.44 10.11 9.61 9.10 8.87   ~ 386 2
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9831 1
3 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 717 0
4 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 714 2
5 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 193 1
6 UGC 4459 GiG 08 34 07.29 +66 10 54.6 15.39 15.03 14.70 14.49   ~ 303 2
7 UGC 4483 GiG 08 37 03.29 +69 46 29.2 15.70 15.46 14.98 14.89   ~ 274 0
8 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 333 1
9 NAME M 81-82 Group GrG 09 55 +69.1           ~ 649 0
10 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 483 0
11 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 707 2
12 NAME M81 dwB G 10 05 30.44 +70 21 53.9 15.95 15.56 15.09 14.87   ~ 182 1
13 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 671 2
14 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 618 1
15 UGC 5692 GiG 10 30 36.58 +70 37 06.0 14.81 13.69 13.01 12.73   ~ 118 0
16 LEDA 32667 LSB 10 52 55.1 +69 32 46   17.2       ~ 78 1
17 NGC 3741 G 11 36 05.754 +45 17 02.96 15.01 14.55 14.23 14.06   ~ 198 0
18 UGC 6817 G 11 50 52.984 +38 52 50.92   13.72 13.9 13.39   ~ 155 0
19 NGC 4163 LSB 12 12 09.108 +36 10 03.13 14.33 13.70 13.2 12.98   ~ 192 0
20 NGC 4190 LSB 12 13 44.1699744302 +36 37 53.391666031 13.88 13.40 13.25 12.86   ~ 189 0
21 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 883 1
22 MCG+09-20-131 G 12 15 46.626 +52 23 13.91   15.3       ~ 63 0
23 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 233 0
24 NAME CVn I dwA GiC 12 38 40.1 +32 45 59 16.91 16.66 16.73 16.62   ~ 205 0
25 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 445 0
26 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 172 0
27 UGC 8651 G 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 138 0
28 UGC 8760 G 13 50 51.3121098935 +38 01 14.956142286 15.56 14.78   14.33   ~ 133 0
29 UGC 8833 G 13 54 48.52 +35 50 14.5   16.5   15.20   ~ 100 1
30 LEDA 166185 G 14 07 10.1 +35 03 37   16.9 17.2     ~ 81 0
31 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 259 0
32 UGC 9240 G 14 24 43.0755108543 +44 31 31.754423687 14.24 13.54 13.17 13.07   ~ 183 0
33 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1462 0
34 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 406 1
35 LEDA 2807157 GiG 23 45 35.177 +38 43 05.09   16.7 15.2     ~ 78 1

    Equat.    Gal    SGal    Ecl

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2021.06.14-11:01:34

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