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J/A+A/406/829  Background galaxies in the WSRT wide-field Survey (Braun+, 2003)

The WSRT wide-field HI survey: I The background galaxy sample Braun R., Thilker D., Walterbos R.A.M. <Astron. Astrophys. 406, 829 (2003)> =2003A&A...406..829B
ADC_Keywords: Galaxies, rotation; Redshifts; H I data Keywords: Galaxies: distances and redshifts -- Galaxies: evolution -- Galaxies: formation -- Galaxies: fundamental parameters -- Galaxies: luminosity function, mass function Description: We have used the Westerbork array to carry out an unbiased wide-field survey for H I emission features, achieving an RMS sensitivity of about 18mJy/beam at a velocity resolution of 17km/s over 1800deg2 and between -1000<VHel<+6500 km/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 60x30 deg in RAxDec. In this paper we present the results for our HI detections of external galaxies at positive Local Group Standard of Rest (LGSR) velocity. We detect 155 external galaxies in excess of 8 sigma in integrated HI flux density. Plausible optical associations are found within a 30' search radius for all but one of our HI detections in DSS images, although several are not previously catalogued or do not have published redshift determinations. Our detection without a DSS association is at low galactic latitude. Twenty-three of our objects are detected in HI for the first time. We classify almost half of our detections as "confused", since one or more companions is catalogued within a radius of 30' and a velocity interval of 400km/s. Nine of the detected galaxies fall so near the edges of the survey coverage (either spatially or in velocity) that their parameters can not be reliably determined. These nine objects are excluded from the enclosed table. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file wsrtgals.dat 80 146 Properties of HI detected Galaxies
Byte-by-byte Description of file: wsrtgals.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name formed from truncated J2000 RA, +DEC 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 19 I2 s RAs Right ascension (J2000) 21 A1 --- DE- Declination sign 22- 23 I2 deg DEd Declination (J2000) 25- 26 I2 arcmin DEm Declination (J2000) 28- 29 I2 arcsec DEs Declination (J2000) 31- 34 I4 km/s HRV Heliocentric radial velocity 36- 38 I3 km/s W20 Velocity profile width at 20% of peak 40- 44 F5.1 Flux Total HI Flux at 1410MHz 46- 49 F4.2 e_Flux Error in total HI Flux 51- 55 F5.2 [solMass] MHI Logarithm of HI Mass in Solar Masses 57- 68 A12 --- ID Catalog Name of most plausible optical ID 70- 71 A2 --- Notes Note about optical ID (1) 73- 76 F4.1 arcmin Offset Angular offset of detection with optical ID 78- 80 I3 --- Confu Confusion index (2)
Note (1): c: confused source (catalogued companion within 30arcmin and 400km/s) ?: source without a previous redshift determination o: significant centroid offset of ID, but less than 10 kpc +: significant centroid offset of ID, larger than 10 kpc, but s/n < 10 ++: very significant centroid offset of ID, larger than 10 kpc and s/n > 10 Note (2): A three digit "confusion" index, "abc" enumerating the number of catalogued companions (truncated at 9) within a 30 arcmin radius which are (a): within 400 km/s (b): between 400 and 1000 km/s (c): of unknown redshift

(End) Robert Braun [Astron] 12-Aug-2003
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