ADC/CDS Standard Document for Catalog:/journal_tables/ApJS/79/77/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
J/ApJS/79/77 Bell Lab. H I Survey - High Velocity Clouds (Stark+ 1992) ================================================================================ The Bell Laboratories H I Survey - High Velocity Cloud Catalog Stark A.A., Gammie C.F., Wilson R.W., Bally J., Linke R.A. <Astrophys. J. Suppl. 79, 77 (1992)> =1992ApJS...79...77S ================================================================================ ADC_Keywords: H I data; Interstellar medium; Radio sources; Surveys Abstract: The sky north of declination -40 deg. was observed in the 21 cm line of atomic hydrogen with the FWHM = 2 deg. beam of the 20 foot horn reflector at AT&T Bell Laboratories, Crawford Hill. The survey covers a velocity range of 654 km/s centered on the Galactic standard of rest, with 5.3 km/s wide filters. This survey is distinguished by its sensitivity to low surface brightness features (antenna temperature about 50 mK) and relative freedom from sidelobe contamination. The high-velocity cloud list was extracted and cataloged automatically from the survey data. Introduction: Observations were made as drift scans along even declinations between -40 deg. and +90 deg. at the epoch (1981) of the observations. The horn antenna has a FWHM beam size of 2 deg. at 21 cm. The average rms noise of spectra taken at all declinations is 0.017 K in 5.2 km/s wide channels, although in some cases naseline problems make the survey unreliable at this level. The clouds cataloged were selected to be those near for which the velocities, when projected on the galactic plane at each possible distance, differed from the circular rotation velocities by more than 40 km/sec. The boundaries of the clouds were determined by either a decrease in emission to near the baseline emission or a steep drop in antenna temperature. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 132 1312 The catalog of high-velocity clouds -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- num +[1,1313] Running number 8- 13 F6.3 deg pkRAdeg Right Ascension (1950) of peak emission 18- 24 F7.3 deg pkDEdeg Declination (1950) of peak emission 29- 35 F7.3 deg pkGLON Galactic longitude of peak emission 40- 46 F7.3 deg pkGLAT Galactic latitude of peak emission 50- 55 F6.2 deg maxGLON Maximum galactic longitude of cloud 60- 65 F6.2 deg minGLON Minimum galactic longitude of cloud 70- 75 F6.2 deg maxGLAT Maximum galactic latitude of cloud 80- 85 F6.2 deg minGLAT Minimum galactic latitude of cloud 90- 95 F6.1 km/sec maxvel Maximum velocity of cloud 100-105 F6.1 km/sec minvel Minimum velocity of cloud 109-115 F7.2 K.km/sec flux Total flux 120-124 F5.2 K antemp Peak antenna temperature 129-132 I4 --- o_cl Number of points cloud detected -------------------------------------------------------------------------------- ================================================================================ (End) N. G. Roman [NASA/NSSDC/ADC] 1994-08-10