J/ApJS/234/2 The GALFA-HI survey data release 2 (Peek+, 2018)
The GALFA-HI survey data release 2.
Peek J.E.G., Babler B.L., Zheng Y., Clark S.E., Douglas K.A., Korpela E.J.,
Putman M.E., Stanimirovic S., Gibson S.J., Heiles C.
<Astrophys. J. Suppl. Ser., 234, 2 (2018)>
=2018ApJS..234....2P 2018ApJS..234....2P
ADC_Keywords: H I data ; Surveys
Keywords: methods: data analysis; radio lines: ISM; surveys
Abstract:
We present the Galactic Arecibo L-Band Feed Array HI (GALFA-HI) survey
data release 2 (DR2). The survey covers the 21cm hyperfine transition
of Galactic HI from -650 to 650km/s, with 0.184km/s channel spacing,
4' angular resolution, and 150mK rms noise per 1km/s velocity channel.
DR2 covers the entirety of the sky available from the William E.
Gordon 305m antenna at Arecibo, from decl. -1°17' to decl.
+37°57' across all R.A.: 4 steradians or 32% of the sky. DR2
differs in a number of ways from data release 1, which was released in
2011. DR2 is built from a largely separate set of observations from
DR1, which were taken in a much more consistent mode. This
consistency, coupled with more careful attention to systematics and
more advanced data reduction algorithms, leads to a much
higher-quality DR2 data product. We present three data sets for public
use: HI data cubes, far- sidelobe stray-radiation-corrected column
density maps, and results of the Rolling Hough Transform linear
feature detection algorithm.
Description:
The GALFA-HI survey is conducted with the William E. Gordon Arecibo
Observatory 305m telescope, located south of Arecibo Puerto Rico. This
survey owes its name to the instrument with which it was conducted,
the ALFA, a 7-beam array of heterodyne detectors, sensitive from 1225
to 1525MHz.
The observational strategy of DR2 is one of the significant
differences from DR1 (Peek+ 2011ApJS..194...20P 2011ApJS..194...20P); see section 2.2.
Region North-1 was included in DR1, but otherwise all of the Arecibo
HI data presented in this work are new.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 62 12 The 12 regions used to construct DR2
table3.dat 142 450 A link table for GALFA-HI Wide data cubes
table4.dat 144 450 A link table for GALFA-HI Narrow data cubes
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See also:
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
J/ApJ/722/395 : Compact H I clouds from the GALFA-H I survey (Begum+, 2010)
J/ApJ/758/44 : The GALFA-HI compact cloud catalog (Saul+, 2012)
J/ApJ/793/132 : Perseus cloud sources Gaussian param. (Stanimirovic+, 2014)
J/ApJ/808/136 : UV counterparts in HI clouds using ALFA data (Donovan+, 2015)
J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)
J/A+A/585/A41 : EBHIS spectra and HI column density maps (Winkel+, 2016)
http://purcell.ssl.berkeley.edu/ : GALFA HI Data Archive
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Region Region identifier
10-11 I2 h RAloh Lower range of Hour of Right ascension
13-14 I2 min RAlom Lower range of Minute Right ascension
16-17 I2 h RAuph Upper range of Hour of Right ascension
19-20 I2 min RAupm Upper range of Minute Right ascension
22-24 I3 deg DElod Lower range of Degree of declination
26-27 I2 arcmin DElom Lower range of Arcminute of declination
29-31 I3 deg DEupd Upper range of Degree of declination
33-34 I2 arcmin DEupm Upper range of Arcminute of declination
36-38 I3 h Time Integration time
40-50 A11 "Y/M/D" DateLo Lower date of observation
51 A1 --- --- [-]
52-62 A11 "Y/M/D" DateUp Upper date of observation
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Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 6 F6.2 deg RAdeg Right Ascension of data cube center (J2000)
8- 13 F6.2 deg DEdeg [2.3/34.4] Declination of data cube center (J2000)
15- 52 A38 --- File Filename, 1.1GB data cube uncompressed
54-144 A91 --- URL Download URL as of 2017-10-05
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History:
From electronic version of the journal
References:
Peek et al. Paper I. 2011ApJS..194...20P 2011ApJS..194...20P
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Mar-2018