ADC/CDS Standard Document for Catalog:/catalogs/8/8030/
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.) |
|
VIII/30 5C14/5C15/5C16 Radio Survey at 408 and 1407 MHz (Benn+ 1991)
================================================================================
The 5C14, 5C15, and 5C16 Radio Source Surveys of the 5C12 Area
Benn C.R., Kenderdine S.
<Mon. Not. Roy. Astron. Soc. 251, 253 (1991)>
=1991MNRAS.251..253B
================================================================================
ADC_Keywords: Galactic pole, north ; Radio sources ; Surveys
Description:
This catalog contains the fourteenth, fifteenth, and sixteenth
sections of the 5C Cambridge survey of radio sources. This catalog
reports further 408 and 1407 MHz observations of the 5C12 area (Benn
et al. 1982), which were carried out with the One-Mile Telescope at
Cambridge to provide more accurate positions for the 5C12 sources
and to extend the 5C12 catalog. Positions and flux densities were
measured for 691 sources in a 5 degree x 5 degree area near the
north galactic pole. The catalog data include the serial (source)
number, right ascension (B1950.0) and declination (B1950.0), rms
uncertainty in 408 MHz position, peak 408 MHz flux density and rms
uncertainty, effective envelope attenuation (P_eff) at 408 MHz,
difference between the 408 MHz and 1407 MHz positions, rms
uncertainty in 1407 MHz position, peak 1407 MHz flux density and
uncertainty, envelope attenuation P at 1407 MHz and radio spectral
index between 408 MHz and 1407 MHz.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
5crssv.dat 98 697 Catalog Data
--------------------------------------------------------------------------------
Byte-by-byte Description of file: 5crssv.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- ID *Source name
7- 8 I2 h RAh * Right ascension (B1950)
10- 11 I2 min RAm * Right ascension (B1950)
13- 17 F5.2 s RAs * Right ascension (B1950)
20 A1 --- DE- sign of Declination
21- 22 I2 deg DEd * Declination (B1950)
24- 25 I2 arcmin DEm * Declination (B1950)
27- 30 F4.1 arcsec DEs *[0,60] Declination (B1950)
32- 35 F4.1 arcsec ErRA408 *? Rms uncertainty in the 408 MHz R.A.
38- 41 I4 mJy S408 *? Peak 408 MHz flux density
43- 46 I4 mJy e_S408 *? Rms uncertainty in S408
49- 53 F5.3 --- Att-408 *? Effective envelope attenuation at 408 MHz
56- 60 F5.1 arcsec Diff-ra *? RA difference in between 408 and 1407 MHz
62- 66 F5.1 arcsec Diff-dec *? DEC difference in between 408 and 1407 MHz
69- 71 F3.1 arcsec ErRA1407 *? Rms uncertainty in the 1407 MHz R.A.
74- 78 F5.1 mJy S1407 *? Peak 1407 MHz flux density
80- 84 F5.1 mJy e_S1407 *? Rms uncertainty in S1407
87- 91 F5.3 --- Att-1407 ? Effective envelope attenuation at 1407 MHz
94- 98 F5.2 --- Alpha *? Radio Spectral Index
--------------------------------------------------------------------------------
Note on ID:
The serial number of the 5C12 source is given in this column. Additions
to the 316-source catalog given in Benn et al. 1982 are numbered from
5C12.317 onwards. Pairs of 1407 MHz detections blended at 408 MHz are
numbered as one source with components a, b. Sources 5C12.7 and 5C12.9
of 5C12 are now known to be lobes of a wide double (see Section 2 of
Benn et al. 1988), and here they have been numbered 7a and 7b.
Note on RAh, RAm, RAs, DEd, DEm, DEs:
Right ascension, declination: The coordinates have been corrected
for precession to epoch B1950.0 measured at 408 MHz or, if detected
at the higher frequency only, at 1407 MHz. The positions are weighted
means of those measured from the 5C12 and 5C14 + 15 + 16 maps.
Note on ErRA408:
Rms uncertainty in the 408 MHz right ascension. The uncertainty in
declination is larger by a factor cosec (declination), approximately
1.74 at the 5C12 map center.
Note on S408, e_S408:
Peak 408 MHz flux density and rms uncertainty, measured from the 5C14 +
5C15 + 5C16 combined map. Flux densities are on the scale of Kellermann
et al. (1969); to bring them on to the scale of Baars et al. (1977),
they should be multiplied by 1.07 (Riley 1988).
Note on Att-408:
Effective envelope attenuation P_eff at 408 MHz. S408 must be
multiplied by this factor to recover the apparent flux density S' with
which the source appears on the 5C14 + 5C15 + 5C16 map, and hence the
signal-to-noise ratio.
Note on Diff-ra, Diff-dec:
Difference between 408 MHz and 1407 MHz positions in the sense
1407-408 MHz. The 1407 MHz position was measured from whichever of the
5C12, 5C14, 5C15, or 5C16 maps gave the highest signal-to-noise ratio.
Note on ErRA1407:
Rms uncertainty in 1407 MHz right ascension. The uncertainty in
declination is larger by a factor cosec(declination).
Note on S1407, e_S1407:
Peak 1407 MHz flux density and uncertainty. The flux density was
measured from whichever of the 5C12, 5C14, 5C15, or 5C16 maps gave the
highest signal-to-noise ratio. Flux densities are on the scale of
Kellermann et al. (1969); to bring them on to the scale of Baars et al.
(1977), they should be multiplied by 1.04.
Note on Alpha:
Radio spectral index between 408 and 1407 MHz, defined by
S_nu =~ nu^(alpha).
--------------------------------------------------------------------------------
Remarks and Modifications:
The 5C14, 5C15, and 5C16 Radio Source Surveys of the 5C12 Area was
received by the Astronomical Data Center (ADC), NASA Goddard Space
Flight Center, from Dr. Heinz Andernach. The catalog was originally
submitted to Dr. Andernach by Dr. C. Benn.
The "alpha" or spectral index column differed in sign between the
published version of this catalog and the electronic version submitted
to the ADC. Apparently the absolute value of the column was the same in
the two versions, only the sign was affected. The electronic version
was modified by the ADC to agree with the printed catalog.
The declination (seconds) column contained a mix of I2 and F4.1 format
numbers in the electronic version submitted to the ADC. A decimal point
was added to the I2 format numbers (byte number 29) by the ADC so the
entire column could be read with an F4.1 format. No change was made to
the data values themselves.
Acknowledgements:
The original ADC documentation by N. A. Oliversen (1994) was used
to create this ReadMe file.
References:
Baars, J. W. M., Genzel, R. Pauliny-Toth, I. I. K., and Witzel, A.
1977, A&A, 61, 99 (1977A&A....61...99B)
Benn, C. R., Grueff, G., Vigotti, M., and Wall, J. V. 1982, MNRAS, 200,
747 (1982MNRAS.200..747B)
Benn, C. R., Grueff, G., Vigotti, M., and Wall, J. V. 1988, MNRAS, 230, 1
(1988MNRAS.230....1B)
Benn, C. R. and Kenderdine, S. 1991, MNRAS, 251, 253 (1991MNRAS.251..253B)
Kellermann, K. I., Pauliny-Toth, I. I. K., and Williams, P. J. S. 1969,
ApJ, 157, 1 (1969ApJ...157....1K)
Riley, J. M. 1988, MNRAS, 233, 225 (1988MNRAS.233..225R)
================================================================================
(End) C.-H. Joseph Lyu [Hughes STX/NASA] 08-Apr-1996