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J/A+A/417/421       WSRT wide-field HI survey. II.           (Braun+, 2004)

The WSRT wide-field HI survey. II. Local Group features. Braun R., Thilker D.A. <Astron. Astrophys., 417, 421-435 (2004)> =2004A&A...417..421B
ADC_Keywords: Molecular clouds ; Radial velocities ; H I data Keywords: galaxies: Local Group - galaxies: evolution - galaxies: formation - galaxies: Magellanic Clouds - galaxies: intergalactic medium - quasars: absorption line Abstract: We have used the Westerbork array to carry out an unbiased wide-field survey for HI emission features, achieving an RMS sensitivity of about 18mJy/Beam at a velocity resolution of 17km/s over 1800deg2 and between -1000<VHel<+6500km/s. The primary data consists of auto-correlation spectra with an effective angular resolution of 49' FWHM. The survey region is centered approximately on the position of Messier 31 and is Nyquist-sampled over 60x30deg in RAxDE. In this paper we present our HI detections at negative velocities which could be distinguished from the Galactic foreground. Fully 29% of the entire survey area has high velocity HI emission at a column density exceeding our 3-sigma limit of about 1.5x1017cm-2 over 30km/s. We tabulate the properties of 95 discrete HVC components in the field, corresponding to more than an order of magnitude increase in number over that known previously. The distribution of discrete object number with flux density has an inflection point near which may correspond to a characteristic mass and distance for this population. A complete description of the observations and general methods of data reduction has already been given in Paper I (Braun et al., Cat. J/A+A/406/829). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 98 95 Catalog of high velocity HI features
See also: J/A+A/406/829 : WSRT wide-field HI survey. I. (Braun+, 2003) J/A+A/391/159 : A search for Compact High-Velocity Clouds (De Heij+, 2002) J/AJ/123/873 : HIPASS high-velocity clouds (Putman+, 2002) J/ApJS/136/463 : Distances and metallicities of HVCs and IVCs (Wakker, 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Running ID number 4- 7 A4 --- Pref Name-prefix (HVC or CHVC) (1) 9- 22 A14 --- Name Name-suffix (LLL.L+BB.B+VVV) (1) 24- 25 I2 h RAh Right ascension (J2000) 27- 28 I2 min RAm Right ascension (J2000) 30- 31 I2 s RAs Right ascension (J2000) 33 A1 --- DE- Declination sign (J2000) 34- 35 I2 deg DEd Declination (J2000) 37- 38 I2 arcmin DEm Declination (J2000) 40- 41 I2 arcsec DEs Declination (J2000) 43- 46 I4 km/s HRV Heliocentric radial velocity 48- 52 F5.1 km/s FWHM Velocity FWHM of the single spectrum with peak column density 54- 57 F4.2 10+18cm-2 NHI Peak HI column density 59- 62 F4.2 deg Maj Major axis FWHM 64- 67 F4.2 deg Min Minor axis FWHM 69- 71 I3 deg PArd [0,180] Major axis PA, CCW in (RA,DE) coord. 73- 77 F5.1 FHI Total HI Flux 81- 98 A18 --- IDs Other published IDs (2)
Note (1): Designation, consisting of a prefix, followed by the Galactic longitude, Galactic latitude, and Local Standard of Rest velocity. The prefix is CHVC for the clouds satisfying our isolation criteria; while HVC is used to indicate clouds connected to more extended complexes. The longitude and latitude refer to the peak of a spatial Gaussian fit to the integrated HI. The velocity refers to the peak of a Gaussian fit to the single spectrum of peak column density. Note (2): References: WW: Wakker & van Woerden, 1991A&A...250..509W, WV NNN in Simbad BB: Braun & Burton, 1999A&A...341..437B, [BB99] NN in Simbad DBB: De Heij et al., 2002 Cat. J/A+A/391/159, [DBB2002] NN in Simbad
Acknowledgements: R. Braun
(End) Patricia Bauer [CDS] 06-Apr-2004
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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