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J/A+A/594/A116      HI4PI spectra and column density maps    (HI4PI team+, 2016)

HI4PI: a full-sky HI survey based on EBHIS and GASS. HI4PI collaboration, Ben Bekhti N., Floeer L., Keller R., Kerp J., Lenz D., Winkel B., Bailin J., Calabretta M.R., Dedes L., Ford H.A., Gibson B.K., Haud U., Janowiecki S., Kalberla P. M. W., Lockman F.J., McClure-Griffiths N.M., Murphy T., Nakanishi H., Pisano D.J., Staveley-Smith L. <Astron. Astrophys. 594, A116 (2016)> =2016A&A...594A.116H (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; H I data ; Milky Way; Interstellar medium ; Spectroscopy Keywords: surveys - ISM: atoms - techniques: spectroscopic Abstract: Measurement of the Galactic neutral atomic hydrogen (HI) column density, NHI, and brightness temperatures, Tb, is of high scientific value for a broad range of astrophysical disciplines. In the past two decades, one of the most-used legacy HI datasets has been the Leiden/Argentine/Bonn Survey (LAB). We release the HI 4-pi survey (HI4PI), an all-sky database of Galactic HI, which supersedes the LAB survey. The HI4PI survey is based on data from the recently completed first coverage of the Effelsberg-Bonn HI Survey (EBHIS) and from the third revision of the Galactic All-Sky Survey (GASS). EBHIS and GASS share similar angular resolution and match well in sensitivity. Combining both, they are ideally suited to be a successor to LAB. The new HI4PI survey outperforms the LAB in angular resolution (16.1', FWHM) and sensitivity (43mK RMS). Moreover, it has full spatial sampling and thus overcomes a major issue of LAB, which severely undersamples the sky. We publish all-sky column density maps of the neutral atomic hydrogen in the Milky Way, along with full spectroscopic data, in several map projections including HEALPix. Description: The HI4PI data release comprises 21-cm neutral atomic hydrogen data of the Milky Way (-600km/s<vlsr<+600km/s for declination >0°; -470km/s<vlsr<+470km/s for declination <0°) as observed with the 100-m radio telescope at Effelsberg and the 64-m radio telescope at Parkes. HI4PI covers the full 4-pi sky. Spectral data is provided in three forms: (1) Standard FITS data cubes, for the full sky in both, Equatorial (J2000) and Galactic coordinates, each in four different map projections, AIT, CAR, MOL, and SFL; see world-coordinate-system, WCS, references: Greisen & Calabretta, 2002A&A...395.1061G, Calabretta & Greisen, 2002A&A...395.1077C, Greisen et al., 2006A&A...446..747G (2) Smaller FITS data cubes, each having a size of about 20x20 sq.deg. For convenience, we provide four different map projections, CAR, SFL, SIN, and TAN (again see WCS references). Note, size in longitude is 20° in absolute coordinates for CAR projection, and 20° true-angular size for SFL, SIN, and TAN projections. Again, Equatorial and Galactic coordinate systems are provided. (3) FITS binary tables containing lists of spectra sampled on a HealPIX grid (nside=1024, Galactic coordinates, Ring indexing scheme, Gorski et al., 2005ApJ...622..759G). To make handling of the data easier, the table is split into smaller files. Each of these contains spectra belonging to one of the 192 base/parent pixels of the nside=4 pixelization. For convenience, the binary tables also contain EQ2000 and Galactic coordinate positions for each individual spectrum, as well as the associated HealPIX index. Furthermore, we provide the full-sky HI column density distribution, both, in a (1) HealPIX-grid binary table (nside=1024, Galactic coordinates, Ring indexing scheme), and (2) Standard FITS 2D images in four map projections, AIT, CAR, MOL, and SFL. Various velocity intervals were applied to calculate NHI. Equatorial and Galactic coordinate systems are provided. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file nhi_eq.dat 31 44 List of all-sky NHI FITS images, Equatorial NHI/EQ2000/* 0 44 All-sky NHI FITS images, Equatorial (1.4G) nhi_gal.dat 31 44 List of all-sky NHI FITS images, Galactic NHI/GAL/* 0 44 All-sky NHI FITS images, Galactic (1.4G) allsky_eq.dat 12 4 List of all-sky FITS data cubes, Equatorial ALLSKY/EQ2000/* 0 4 All-sky FITS data cubes, Equatorial (120G) allsky_gal.dat 12 4 List of all-sky FITS data cubes, Galactic ALLSKY/GAL/* 0 4 All-sky FITS data cubes, Galactic (120G) cubes_eq.dat 28 534 List of 20dx20d FITS data cubes, Equatorial CUBES/EQ2000/* 0 534 20dx20d FITS data cubes, Equatorial (132G) cubes_gal.dat 28 534 List of 20dx20d FITS data cubes, Galactic CUBES/GAL/* 0 534 20dx20d FITS data cubes, Galactic (132G) nhi_hpx.dat 71 12582912 HI column densities NHI_HPX.fits 2880 209720 HI column densities (HPX-grid FITS binary table) hpxspec.dat 52 192 List of HPX-grid FITS binary tables HPX/* 0 192 Individual HPX-grid FITS binary tables (45G)
Byte-by-byte Description of file: nhi_eq.dat
Bytes Format Units Label Explanations
1- 3 A3 --- WCSproj WCS projection code 5- 8 I4 km/s b_RVel Lower radial velocity limit (LSR, Radio) 10- 13 I4 km/s B_RVel Upper radial velocity limit (LSR, Radio) 15- 31 A17 --- FileName Name of FITS file in subdirectory NHI/EQ2000
Byte-by-byte Description of file: nhi_gal.dat
Bytes Format Units Label Explanations
1- 3 A3 --- WCSproj WCS projection code 5- 8 I4 km/s b_RVel Lower radial velocity limit (LSR, Radio) 10- 13 I4 km/s B_RVel Upper radial velocity limit (LSR, Radio) 15- 31 A17 --- FileName Name of FITS file in subdirectory NHI/GAL
Byte-by-byte Description of file: allsky_eq.dat
Bytes Format Units Label Explanations
1- 3 A3 --- WCSproj WCS projection code 5- 12 A8 --- FileName Name of FITS file in subdirectory ALLSKY/EQ2000
Byte-by-byte Description of file: allsky_gal.dat
Bytes Format Units Label Explanations
1- 3 A3 --- WCSproj WCS projection code 5- 12 A8 --- FileName Name of FITS file in subdirectory ALLSKY/GAL
Byte-by-byte Description of file: cubes_eq.dat
Bytes Format Units Label Explanations
1- 5 F5.1 deg RAdeg Right ascension (J2000) of data cube center 7- 11 F5.1 deg DEdeg Declination (J2000) of data cube center 13- 15 A3 --- WCSproj WCS projection code 17- 28 A12 --- FileName Name of FITS file in subdirectory CUBES/EQ2000
Byte-by-byte Description of file: cubes_gal.dat
Bytes Format Units Label Explanations
1- 5 F5.1 deg GLON Galactic longitude of data cube center 7- 11 F5.1 deg GLAT Galactic latitude of data cube center 13- 15 A3 --- WCSproj WCS projection code 17- 28 A12 --- FileName Name of FITS file in subdirectory CUBES/GAL
Byte-by-byte Description of file: nhi_hpx.dat
Bytes Format Units Label Explanations
1- 8 I8 --- HPX HPX index (HPXINDEX) 10- 18 F9.5 deg RAdeg Right ascension (J2000) 20- 28 F9.5 deg DEdeg Declination (J2000) 30- 38 F9.5 deg GLON Galactic longitude (J2000) 40- 48 F9.5 deg GLAT Galactic latitude (J2000) 50- 71 E22.15 cm-2 NHI HI column density
Byte-by-byte Description of file: hpxspec.dat
Bytes Format Units Label Explanations
1- 8 F8.4 deg GLON Galactic longitude 10- 17 F8.4 deg GLAT Galactic latitude 19- 26 F8.4 deg RAdeg Right ascension (J2000) 28- 35 F8.4 deg DEdeg Declination (J2000) 37- 39 I3 --- HPXidx HealPIX index (nside=4, RING scheme,0-based) 41- 52 A12 --- FileName Name of the FITS file in subdirectory HPX
Acknowledgements: Benjamin Winkel, bwinkel(at)mpifr.de References: McClure-Griffiths et al., 2009ApJS..181..398M Kalberla et al., 2010A&A...521A..17K Winkel et al., 2010ApJS..188..488W Kerp et al., 2011AN....332..637K Kalberla & Haud, 2015A&A...578A..78K Winkel et al., 2016A&A...585A..41W
(End) Patricia Vannier [CDS] 22-Sep-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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