J/AJ/74/366 Flux densities at 22.25 MHz. I. (Roger+, 1969)
Spectral flux densities of radio sources at 22.25 MHz. I.
Roger R.S., Costain C.H., Lacey J.D.
<Astron. J. 74, 366 (1969)>
=1969AJ.....74..366R 1969AJ.....74..366R (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources
Abstract:
Flux densities for 200 radio sources have been derived from
observations with the 22.25MHz radio telescope at the Dominion Radio
Astrophysical Observatory. Ionospheric conditions, the method of
calibration, and the reduction procedure are described. The effects of
these new measures on the spectral indices of the sources are
indicated.
Note: this catalogue is superseded by Cat. J/A+AS/65/485
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 206 Flux densities at 22.25MHz
notes.dat 82 35 Individual notes
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See also:
J/A+AS/65/485 : Flux densities at 22.25 MHz. II. (Roger+ 1986)
(supersedes this version)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 38 A38 --- Name Source designations (1)
39 A1 --- l_S22.25MHz Limit flag on S22.25MHz
40- 44 I5 Jy S22.25MHz Flux at 22.25MHz
47- 50 I4 Jy e_S22.25MHz ? rms uncertainty on S22.25MHz
53- 54 I2 --- Nrec ? Number of records used to derive S22.25MHz
56- 77 A22 --- Conf Name of confusing sources (2)
80- 99 A20 --- Bkg Name of background complexity (3)
100-101 I2 --- Notes ? Individual note detailed in file notes.dat
103-106 A4 --- Spec Spectrum to 22MHz (4)
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Note (1): An * following the name indicates that the two consecutive sources
are associated and that the data apply to the sum of both sources.
Note (2): Confusion exists with the source listed in this column and the flux
density has been corrected for it. If the identification of the
confusing source is uncertain, the tentative identification is given
in brackets [ ]. Not previously catalogued sources are listed
as "NPC".
Sources in parentheses ( ) may contribute to the flux density but are
not apparent on the records and have therefore not been allowed for.
Note (3): A cross (X) in this column indicates that the background emission in
the neighborhood of the source has complex structure which may
affect the accuracy of the flux density measurement. If the
complexity is due to nearby sources or their sidelobes (sl.), these
are listed in the column.
Note (4): Effect of the 22MHz flux density on the spectrum defined by
higher-frequency measurements.
S: confirmation of a straight spectrum or lack of evidence for
departures from a straight spectrum.
C+: upward curving of the spectrum at low frequency
C-: downward trend
Doubtful trends are shown with these symbols in parentheses
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Notes Number of the note
4- 82 A79 ---- Note Text of the Note
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 21-Jun-1999