J/ApJS/140/331 High-velocity HI observations at 21cm (Lockman+, 2002)
A very sensitive 21 centimeter survey for galactic high-velocity H I.
Lockman F.J., Murphy E.M., Petty-Powell S., Urick V.J.
<Astrophys. J. Suppl. Ser., 140, 331-365 (2002)>
=2002ApJS..140..331L 2002ApJS..140..331L
ADC_Keywords: H I data ; Surveys ; Radial velocities ; Diffuse clouds
Keywords: Galaxy: halo - Galaxy: structure - ISM: clouds - surveys
Abstract:
Very sensitive HI 21cm observations have been made in 860 directions
at δ≥-43° in search of weak, Galactic, high-velocity HI
emission lines at moderate and high Galactic latitudes.
Description:
The observations were made with the 140 Foot (43m) Telescope of the
NRAO in Green Bank, WV, during 19 observing sessions between 1993
March and 1996 September.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 287 Observed central positions
table3.dat 118 430 Detections of high-velocity hydrogen
table4.dat 76 309 High velocity gaussian components
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See also:
J/A+AS/142/25 : High velocity HI Southern Survey (Morras+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Object name
15 A1 --- f_Name [ab] Flanking position (1)
17- 18 I2 h RAh Hour of Right Ascension (B1950)
20- 21 I2 min RAm Minute of Right Ascension (B1950)
23- 24 I2 s RAs Second of Right Ascension (B1950)
26 A1 --- DE- Sign of the Declination (B1950)
27- 28 I2 deg DEd Degree of Declination (B1950)
30- 31 I2 arcmin DEm Arcminute of Declination (B1950)
33- 34 I2 arcsec DEs Arcsecond of Declination (B1950)
36- 42 F7.3 deg GLON Galactic longitude
44- 50 F7.3 deg GLAT Galactic latitude
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Note (1): Note as follows:
a = Flanking positions offset 13.5 minutes in right ascension.
b = Flanking position at lower right ascension only.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- LMPU The identification number
5- 16 A12 --- Name Object name (G1)
17 A1 --- n_Name [±] Flanking direction (G1)
19- 20 I2 h RAh Hour of Right Ascension (B1950)
22- 23 I2 min RAm Minute of Right Ascension (B1950)
25- 26 I2 s RAs Second of Right Ascension (B1950)
28 A1 --- DE- Sign of the Declination (B1950)
29- 30 I2 deg DEd Degree of Declination (B1950)
32- 33 I2 arcmin DEm Arcminute of Declination (B1950)
35- 36 I2 arcsec DEs Arcsecond of Declination (B1950)
38- 44 F7.3 deg GLON Galactic longitude
46- 52 F7.3 deg GLAT Galactic latitude
54- 59 F6.1 mK Tpeak ? Beam-average brightness peak temperature (2)
61- 65 F5.1 mK e_Tpeak ? Uncertainty in TPeak
67- 71 F5.1 km/s DelV ? Line width (2)
73- 76 F4.1 km/s e_DelV ? Uncertainty in DelV
78- 83 F6.1 km/s VLSR ? Local Standard of Rest velocity
85- 88 F4.1 km/s e_VLSR ? Uncertainty in VLSR
90- 93 F4.1 mK RMSG ? RMS noise of the data with respect to the
Gaussian
95- 98 F4.1 mK RMSB RMS noise of the data with respect to the
polynomial baseline
100-103 F4.2 10+19cm-2 NHI ? Hydrogen column density in a line wing
105-108 I4 km/s Vel ? Mean velocity of the line wing
110-118 A9 --- Rem Remarks (3)
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Note (2): Uncorrected for instrumental broadening, which can be significant
for the narrowest lines.
Note (3): Note use the abbreviations:
A = Alternate reference position used;
F = Frequency-switched observations;
H = Hanning smoothed;
U = Uncertain.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Component identification number
5- 11 F7.3 deg GLON Galactic longitude
13- 19 F7.3 deg GLAT Galactic latitude
21- 32 A12 --- Name Object name (G1)
33 A1 --- n_Name [±] Flanking direction (G1)
35- 36 I2 h RAh Hour of Right Ascension (B1950)
38- 39 I2 min RAm Minute of Right Ascension (B1950)
41- 42 I2 s RAs Second of Right Ascension (B1950)
44 A1 --- DE- Sign of the Declination (B1950)
45- 46 I2 deg DEd Degree of Declination (B1950)
48- 49 I2 arcmin DEm Arcminute of Declination (B1950)
51- 52 I2 arcsec DEs Arcsecond of Declination (B1950)
54- 59 F6.1 km/s Vpeak Velocity of line peak
61- 68 E8.2 cm-2 NHI Hydrogen column density (2)
70- 76 A7 --- Complex Name of associated complex
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Note (2): Refers to the entire Gaussian even if part of it lies at
|VLSR|<100 km/s.
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Global Notes:
Note (G1): Directions are identified by the common name of the extragalactic
source upon which they were centered, with a "-" or "+" suffix to
indicate flanking directions in a triple.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 18-Oct-2005