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J/ApJS/230/7     Spectral flux densities from 50MHz to 50GHz     (Perley+, 2017)

An accurate flux density scale from 50 MHz to 50 GHz. Perley R.A., Butler B.J. <Astrophys. J. Suppl. Ser., 230, 7-7 (2017)> =2017ApJS..230....7P (SIMBAD/NED BibCode)
ADC_Keywords: Interferometry ; Radio sources Keywords: instrumentation: interferometers; methods: data analysis; methods: observational; techniques: interferometric; telescopes Abstract: The flux-density scale of Perley & Butler (2013ApJS..204...19P) is extended downward to ∼50MHz by utilizing recent observations with the Karl G. Jansky Very Large Array (VLA) of 20 sources between 220MHz and 48.1GHz, and legacy VLA observations at 73.8MHz. The derived spectral flux densities are placed on an absolute scale by utilizing the Baars+ (1977A&A....61...99B) values for Cygnus A (3C405) for frequencies below 2GHz, and the Mars-based polynomials for 3C286, 3C295, and 3C196 from Perley & Butler above 2GHz. Polynomial expressions are presented for all 20 sources, with accuracy limited by the primary standards to 3%-5% over the entire frequency range. Corrections to the scales proposed by Perley & Butler, and by Scaife & Heald (2012MNRAS.423L..30S) are given. Description: The VLA observations were made in five observing sessions: 1998 Mar 07-08, 1998 Oct 04-05, 2014 Oct 11-12, 2016 Jan 25-26 and 2016 Jan 27. The first two of these sessions were taken under Project ID AK461. These data were taken with the original VLA correlator, with 1.6MHz bandwidth. All other data were taken with the new Jansky VLA system. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 60 20 Source list table5.dat 137 34 Derived spectral flux densities table10.dat 82 20 Flux calibrator suitability for VLA
See also: J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Source name 12- 32 A21 --- OName Alternate name 34 A1 --- Band4 [*] *: Band 4 used for this source (1) 36 A1 --- BandP [*] *: Band P used for this source (1) 38 A1 --- BandL [*] *: Band L used for this source (1) 40 A1 --- BandS [*] *: Band S used for this source (1) 42 A1 --- BandC [*] *: Band C used for this source (1) 44 A1 --- BandX [*] *: Band X used for this source (1) 46 A1 --- BandKu [*] *: Band Ku used for this source (1) 48 A1 --- BandK [*] *: Band K used for this source (1) 50 A1 --- BandKa [*] *: Band Ka used for this source (1) 52 A1 --- BandQ [*] *: Band Q used for this source (1) 54- 60 F7.2 arcsec LAS [0.6/3000] Largest Angular Size
Note (1): Band code as in table 1: ----------------------------------------------------------------- Band lambda Frequency span (MHz) ----------------------------------------------------------------- 4 4m 73-74.6 P 90cm 224-480 L 20cm 1000-2000 S 10cm 2000-4000 C 5cm 4000-8000 X 3cm 8000-12000 Ku 2cm 12000-18000 K 13mm 18000-26500 Ka 9mm 26500-40000 Q 7mm 40000-50000 ----------------------------------------------------------------- The VLA's low-frequency system now comprises a single receiver covering 50-480MHz and two feeds, covering 50-80, and 224-480MHz, respectively. The 90cm observations described here are taken with this new system. The 4m observations described here are from the narrowband "legacy" system (Kassim+ 2007ApJS..172..686K), which is now disabled.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 F6.3 GHz Freq [0.07/48.1] Frequency 8- 12 F5.2 Jy J0133 Flux density of J0133-3629 at Freq (1) 14- 19 F6.3 Jy 3C48 Flux density of J0137+3309 (3C48) at Freq (1) 21- 23 I3 Jy ForA Flux density of J0322-3712 (Fornax A) at Freq (1) 25- 30 F6.2 Jy 3C123 Flux density of J0437+2940 (3C123) at Freq (1) 32- 36 F5.2 Jy J0444 Flux density of J0444-2809 at Freq (1) 38- 43 F6.3 Jy 3C138 Flux density of J0521+1638 (3C138) at Freq (1) 45- 49 F5.1 Jy PicA Flux density of J0519-4546 (Pictor A) at Freq (1) 51- 54 I4 Jy 3C144 Flux density of J0534+2200 (3C144) at Freq (1) 56- 60 F5.2 Jy 3C147 Flux density of J0542+4951 (3C147) at Freq (1) 62- 68 F7.3 Jy 3C196 Flux density of J0813+4813 (3C196) at Freq (1) 70- 75 F6.2 Jy 3C218 Flux density of J0918-1205 (3C218) at Freq (1) 77- 80 I4 Jy 3C274 Flux density of J1230+1223 (3C274) at Freq (1) 82- 86 F5.2 Jy 3C286 Flux density of J1331+3030 (3C286) at Freq (1) 88- 94 F7.3 Jy 3C295 Flux density of J1411+5212 (3C295) at Freq (1) 96-101 F6.2 Jy 3C348 Flux density of J1651+0459 (3C348) at Freq (1) 103-107 F5.1 Jy 3C353 Flux density of J1720-0058 (3C353) at Freq (1) 109-114 F6.2 Jy 3C380 Flux density of J1829+4844 (3C380) at Freq (1) 116-120 I5 Jy 3C405 Flux density of J1959+4044 (3C405) at Freq (1) 122-127 F6.3 Jy 3C444 Flux density of J2214-1701 (3C444) at Freq (1) 129-133 I5 Jy 3C461 Flux density of J2323+5848 (3C461) at Freq (1) 135-137 F3.1 % Err [0.2/4.7] Percent post-fit standard deviation
Note (1): A value of zero indicates no observation at that frequency.
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Source name 12- 17 A6 --- Var Variability criterion (1) 19- 22 F4.1 GHz MaxFreq [0.2/30]? Maximum frequency (if null = All) (2) 23 A1 --- f_MaxFreq [A] A = All 25 A1 --- Range1 [0] Lower baseline range 26 A1 --- --- [-] 27 A1 --- l_Range2 Upper limit flag on Range2 28- 34 F7.2 --- Range2 [0.05/5000] Upper baseline range (kilowavelenghts) to meet confusion, structure, and sensitive criteria 36- 82 A47 --- Comm Comments
Note (1): Variability criterion--maximum frequency in GHz for sources with strong nuclei. Note (2): Frequency below which the primary beam resolution criterion is met.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jun-2017
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

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