J/AJ/105/393 Small Drift Scan Survey Galaxies Northern Sky (Kent+ 1993)
A Small Drift Scan Survey for Galaxies in the Northern Sky Kent S.M., Ramella M., Nonino M. <Astron. J. 105, 393 (1993)> =1993AJ....105..393K
ADC_Keywords: Galaxy catalogs ; Magnitudes ; Selected areas Abstract: The file is an ASCII text file containing data for 1053 galaxies brighter than 18.0 mag. in the filter used. The effective wavelength of this filter for objects that have the color of galaxies closely matches that of Thuan and Gunn r filter. The strip covered in the survey is 12 arcmin wide by 60 degree long. The observations were carried out on the night of 23 May 1990, using the drift scanning technique, with the 24 inch telescope of the Whipple Observatory. The effective integration time was 57 s. Introduction: One key problem of galaxy surveys using photographic plates is an accurate magnitude calibration. Moreover sensitivity and vignetting variations across the plate, need to be removed. The drift-scan technique is a viable alternative: in this observing mode the telescope tracking is stopped and the CCD is clocked at the sidereal rate. CCD columns are aligned in the east-west direction. The CCD is read continuously, building up an image of a strip of the sky. Data were reduced in the standard manner, but replacing bias with drift dark (CCD is operating in drift scan mode with the shutter closed). Flatfields were obtained from median averaging sets of data frames. Astrometry was done using stars whose position was known from the Guide Star Catalog. The galaxy-star classification was done using the east-west FWHM. Then every candidate galaxy was visually inspected. Important Notice: The published coordinates have errors (up to 6" in the worst case): this is due to a charge smearing problem, which correlates with magnitude. The coordinates in this version are the corrected ones. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 42 1053 *The galaxy catalog
Note on table.dat: Galaxy number 357 has been removed in the electronic table.
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID *[1/1054]+ Number as in the published version 6- 7 I2 h RAh [11/16]+= 1950 Right Ascension 9- 10 I2 min RAm 1950 Right Ascension minutes 12- 17 F6.3 s RAs 1950 Right Ascension seconds 20- 21 I2 deg DEd [29/29] 1950 Declination degrees 23- 24 I2 arcmin DEm 1950 Declination minutes of arc 26- 30 F5.2 arcsec DEs 1950 Declination seconds of arc 32- 36 F5.2 mag Mag Magnitude 37 A1 --- u_Mag Uncertainty Flag on Magnitude 38- 42 F5.1 arcsec Ap Aperture radius used to compute Mag
Note on ID: the galaxy number 357 is missing in the electronic table: galaxies 357 and 358 seem identical in the printed table.
History: * July 1994: the first version was prepared by N. Paul. M. Kuin [NSSDC/ADC] and M. Nonino [Trieste]. * December 1996: the ID number was added at CDS (P. Dubois) Acknowledgements: This work has been supported by NSF Grant No. AST 8451724, Nato Grant No. CRG 901016, and a donation from the Digital Equipment Corporation
(End) N. Paul. M. Kuin [NSSDC/ADC] and M. Nonino [Trieste] 05-Dec-1996
|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|