VIII/37 The Third Bologna Survey (B3) (Ficarra+ 1985)
Third Bologna Survey at 408 MHz Ficarra A., Grueff G., Tomassetti G. <Astron. Astrophys. Suppl. Ser. 59, 255 (1985)> =1985A&AS...59..255F
ADC_Keywords: Radio sources ; Surveys Keywords: radiotelescope - radiosources - catalogue Description: This catalogue contains the first section of a sky survey performed at 408MHz with the 'Northern Cross' Radiotelescope. It contains about 13.000 radiosources. Although sources down to about 70mJy were measured, only sources brighter than 0.10Jy are retained in the catalogue. According to our estimate of confusion errors, this corresponds to a detection threshold of about 5σ. The list is meant to include all the sources with a measured flux S>0.10Jy, in the sky area included between the declinations +37°15' and +47°37', epoch 1978.0. A number of zones however are affected by interferences, malfunctions, etc. The principal one is centered about the radiosource Cyg A, which is itself in the map, but not in the catalogue. The zone between RA 19h30m to 20h30m is entirely lacking, due to strong confusion. In the zone from 19h00m to 19h30m and from 20h30m to 21h00m, only sources brighter than 0.75Jy are listed, and to this level the catalogue is espected to be complete. For detailed discussion of the completeness of the catalogue see the original publication cited above. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file b3.dat 48 13340 The Bologna Third Catalogue
See also: VIII/36 : The Second Bologna Servey (B2) J/AJ/98/419 : Observed quantities from B3 sources Byte-by-byte Description of file: b3.dat
Bytes Format Units Label Explanations
1- 9 A9 --- B3 Source name, (IAU-style), eventually followed by a multiplicity letter A, B... 12- 13 I2 h RAh Right Ascension (1950.0) 14- 15 I2 min RAm Right Ascension (1950.0) 16- 19 F4.1 s RAs [0/60] Right Ascension (1950.0) 20 A1 --- DE- [+] Declination sign 21- 22 I2 deg DEd Declination (1950.0) 23- 24 I2 arcmin DEm Declination (1950.0) 25- 26 I2 arcsec DEs Declination (1950.0) 29- 33 F5.2 Jy Flux The source total flux. In the large majority of cases, this is practically equivalent to the peak flux 35- 37 F3.1 --- Fit Goodness of the fitting algorithm, related to the R.M.S. value of te residuals in the fitting matrix 39- 42 I4 --- ACOD1 ? Four digit string indicating source reliability (1) 44 A1 --- n_Diam [RD] If not blank the source were measured by a double source algorithm. R => resolved D => double 45- 48 F4.1 arcmin Diam ? If the source is double: the separation
Note (1): An algorithm was devised by which every source was marked with a four-digit number n1, n2, n3, n4 with each digit indicating a separate reason for problems, as follows: n1: a disturbing, strong source is present, very close in R.A., or very close in DEC. The flux ratio R is indicated by n1 and is n1 = R/10, truncated to the integer. n2: if non-zero, it indicates that the source lies in the vertical part of the cross-shaped area, and in the position of a grating response in N-S. It thus indicates a larger chance for the source to be spurious. The value itself is the rank of the grating response (n2 = 5 means the grating closer to the source, etc. down to n2 = 1) n3: if non-zero it means that the source is very close to a very strong source, although not in the cross-shaped area mentioned above. A circular area is defined with radius r=2.8sqrt(R)pix; n3 indicates how close the source is to the disturbing source, in units of 1/r n4: if n4 > 4, it indicates that the source lies within a disturbed area with the following code: 5: solar interferences 6: sidelobes of Cyg A 7: supernova remnant G160.4+2.8 (Felli et al., 1977A&AS...27..181F) 8: supernova remnant G166.0+4.3 (Willis, 1973A&A....26..237W) 9: man-made interferences If n4 < 4, it indicates that n4 (and no more) disturbing sources are present. In this case the previous digit refer to the stronger disturbing source.
Acknowledgements: The file and the basic documentation were kindly provided by Marzia Cannizzaro in September 1995.
(End) Patricia Bauer [CDS] 16-Sep-1997
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