J/AJ/160/66 LITTLE THINGS catalog of HI holes in 41 galaxies (Pokhrel+, 2020)
A catalog of holes and shells in the interstellar medium of the LITTLE THINGS
dwarf galaxies.
Pokhrel N.R., Simpson C.E., Bagetakos I.
<Astron. J., 160, 66 (2020)>
=2020AJ....160...66P 2020AJ....160...66P
ADC_Keywords: Galaxies, nearby; Interstellar medium; Star Forming Region;
H I data; Radio lines; Regional catalog
Keywords: Dwarf irregular galaxies ; HI shells ; Interstellar medium ;
Star formation
Abstract:
We present a catalog of holes and shells in the neutral atomic
hydrogen (HI) of 41 gas-rich dwarf galaxies in LITTLE THINGS (Local
Irregulars That Trace Luminosity Extremes, The HI Nearby Galaxy
Survey). We analyzed their properties as part of an investigation into
the relation between star formation and structures and kinematics in
the HI of small galaxies. We confirmed 306 holes between 38pc (our
resolution limit) and 2.3kpc, with expansion velocities up to 30km/s.
The global star formation rates (SFRs) measured by Hα and far-UV
(FUV) emission are consistent with those estimated from the energy
required to create the cataloged holes in our sample. Although we
found no obvious correlation between global star forming regions
(SFRs) and the HI surface and volume porosities of our sample, two of
the four galaxies with the lowest porosity and the two galaxies with
the highest porosity have no recent star formation as measured by
Hα and FUV emission.
Description:
For this study, we use data from the LITTLE THINGS (Local Irregulars
That Trace Luminosity Extremes, The H i Nearby Galaxy Survey) project,
which looks at star formation processes in dwarf galaxies. The LITTLE
THINGS sample contains 41 gas-rich, non-interacting, relatively
isolated nearby dwarf galaxies with a wide range of properties.
The LITTLE THINGS multiwavelength data set includes HI observations
obtained with the National Radio Astronomy Observatory (NRAO) NSF's
Karl G. Jansky Very Large Array (VLA). These data have high
sensitivity (≤1.1mJy/beam/channel), high angular resolution (∼6"),
and high velocity resolution. The HI data for 20 galaxies are taken
from the VLA archives, with 2.6km/s channel separation; the separation
is 1.3km/s for the new data obtained from the VLA in the B, C, and D
array configurations by the LITTLE THINGS group. The angular
resolution limit of 6" corresponds to linear resolutions ranging from
∼26 to 300pc, with 110pc at the average distance of 3.7Mpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 52 41 Basic galaxy information
tableb1.dat 81 1 Hole Properties of CVnIdwA
tableb2.dat 81 15 Hole Properties of DDO 43
tableb3.dat 81 18 Hole Properties of DDO 46
tableb4.dat 81 19 Hole Properties of DDO 47
tableb5.dat 81 41 Hole Properties of DDO 50
tableb6.dat 81 17 Hole Properties of DDO 52
tableb7.dat 81 7 Hole Properties of DDO 53
tableb8.dat 81 7 Hole Properties of DDO 63
tableb9.dat 81 4 Hole Properties of DDO 69
tableb10.dat 81 9 Hole Properties of DDO 70
tableb11.dat 81 4 Hole Properties of DDO 75
tableb12.dat 81 18 Hole Properties of DDO 87
tableb13.dat 81 2 Hole Properties of DDO 101
tableb14.dat 81 4 Hole Properties of DDO 126
tableb15.dat 81 5 Hole Properties of DDO 133
tableb16.dat 81 9 Hole Properties of DDO 154
tableb17.dat 81 3 Hole Properties of DDO 155
tableb18.dat 81 3 Hole Properties of DDO 165
tableb19.dat 81 3 Hole Properties of DDO 167
tableb20.dat 81 2 Hole Properties of DDO 168
tableb21.dat 81 3 Hole Properties of DDO 187
tableb22.dat 81 1 Hole Properties of DDO 210
tableb23.dat 81 3 Hole Properties of DDO 216
tableb24.dat 81 8 Hole Properties of F564-V3
tableb25.dat 81 2 Hole Properties of Haro 29
tableb26.dat 81 1 Hole Properties of Haro 36
tableb27.dat 81 20 Hole Properties of IC 10
tableb28.dat 81 11 Hole Properties of IC 1613
tableb29.dat 81 7 Hole Properties of LGS 3
tableb30.dat 81 10 Hole Properties of M81dwA
tableb31.dat 81 1 Hole Properties of Mrk 178
tableb32.dat 81 5 Hole Properties of NGC 1569
tableb33.dat 81 11 Hole Properties of NGC 2366
tableb34.dat 81 3 Hole Properties of NGC 3738
tableb35.dat 81 21 Hole Properties of NGC 4214
tableb36.dat 81 1 Hole Properties of SagDIG
tableb37.dat 81 3 Hole Properties of UGC 8508
tableb38.dat 81 4 Hole Properties of WLM
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See also:
VIII/11 : Berkeley Low-Latitude H I Survey (Weaver+ 1973)
J/A+A/229/362 : Small-scale structures in HI hole of M33 (Deul+, 1990)
J/AJ/128/2170 : Hα imaging of irregular galaxies (Hunter+, 2004)
J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004)
J/A+A/437/101 : HI shells in the outer Milky Way (Ehlerova+, 2005)
J/ApJ/621/673 : Line indices for 124 early-type galaxies (Thomas+, 2005)
J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007)
J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)
J/A+A/496/177 : JHKs and GLIMPSE photometry of RCW 120 (Deharveng+, 2009)
J/AJ/141/23 : HI holes in THINGS galaxies (Bagetakos+, 2011)
J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies (Hunter+, 2012)
J/A+A/550/A23 : HI shells in Leiden/Argentina/Bonn HI survey (Ehlerova+, 2013)
J/AJ/146/104 : Dwarf galaxies surface brightness profiles I. (Herrmann+,2013)
J/A+A/564/A116 : HI supershells catalogue (Suad+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- ID Galaxy identification
11- 12 I2 h RAh Hour of right ascension (J2000)
14- 15 I2 min RAm Minute of right ascension (J2000)
17- 20 F4.1 s RAs Second of right ascension (J2000)
22 A1 --- DE- [±] Sign of declination (J2000)
23- 24 I2 deg DEd Degree of declination (J2000)
26- 27 I2 arcmin DEm Arcminute of declination (J2000)
29- 30 I2 arcsec DEs Arcsecond of declination (J2000)
32- 35 F4.1 Mpc Dist [0.5/10.3] Distance (1)
37- 41 F5.1 deg PA [-85/89] Position angle (1)
43- 47 F5.2 deg i [0/72.1]? Inclination (1)
49- 52 F4.2 kpc RD [0.15/2.26] V-band scale length (2)
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Note (1): From Hunter+, 2012, J/AJ/144/134
Note (2): From Hunter+, 2004, J/AJ/128/2170
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Byte-by-byte Description of file: tableb*.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Hole sequential identification
4- 5 I2 h RAh Hour of right ascension (J2000)
7- 8 I2 min RAm Minute of right ascension (J2000)
10- 13 F4.1 s RAs Second of right ascension (J2000)
15 A1 --- DE- Sign of declination (J2000)
16- 17 I2 deg DEd Degree of declination (J2000)
19- 20 I2 arcmin DEm Arcminute of declination (J2000)
22- 25 F4.1 arcsec DEs Arcsecond of declination (J2000)
27- 30 I4 km/s vhel Heliocentric velocity
32- 33 I2 km/s vexp Expansion velocity
35 I1 --- Type Hole type
37- 39 I3 deg PA Position angle
41- 44 I4 pc Diam Hole's diameter
46- 50 F5.1 Myr Age Age
52- 55 F4.1 [/cm2] logNHI Log H I column density (1020/cm-2)
57- 60 F4.1 kpc Rad Radius
62- 64 F3.1 --- b/a Axial ratio
66- 69 I4 Msun Mass ? H I mass (104M☉)
71- 75 F5.2 [10-7J] logEMc ? Energy required to form the hole calculated
with McCray method (1050erg) (1)
77- 81 F5.2 [10-7J] logECh ? Energy required to form the hole calculated
with Chevalier method (1050erg) (2)
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Note (1): See McCray+, 1987ApJ...317..190M 1987ApJ...317..190M or section 3.2 of the article
Note (2): See Chevalier+, 1974ApJ...188..501C 1974ApJ...188..501C or section 3.2 of the article
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 14-Dec-2020