Access to Astronomical Catalogues

Search catalogue
obsoleted
in preparation
catalog without ftp or VizieR link
J/AZh/74/42                 RATAN-600 radio sources spectra (Bursov 1997)

Spectra of weak radio sources from the RATAN-600 "Kholod" deep survey Bursov N.N <Astron. Zh., 74, 42 (1997)> =1997AZh....74...42B (SIMBAD/NED BibCode) =1997ARep...41...35B
ADC_Keywords: Radio sources ; Spectroscopy Abstract: A multifrequency deep survey of a band of sky with the declination of the source SS 433 (δ∼5°±20') was performed as part of the "Kholod" program on the RATAN-600 in 1987-1988. The right ascension intervals covered by the survey are 0h<α<14h and 18h<α<24h. The spectral properties of 400 sources from the RC catalog were determined for the first time by using only RATAN-600 data. The maximum in the flux density distribution for these sources at the central wavelength, λ7.6cm, occurs at ∼30mJy. The lower flux limits for the sample at wavelengths of 3.9, 7.6, 13.0, and 31.0cm are 16, 9, 37, and 61mJy, respectively. These observations provide the first flux estimates at 13.0 and 31.0cm for 90% of the sources. Spectra were measured for the first time for 112 sources (28%) and were revised for 90 sources (23%). The maximum in the spectral index distribution for the entire sample in the interval from λλ7.6-31.0cm occurs at α=-0.86±0.04 (Svα). The spectra of some 20 of the sample sources (5%) are peaked at roughly 1GHz, and about 40 spectra (10%) have low-frequency breaks. Roughly 70 sources (19%) have flat spectra (α>-0.5), and 64 (18%) have very steep spectra (α←1.1). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 100 400 Flux densities for RC radio sources (1988.0)
See also: VIII/33 : Spectral characteristics of RATAN (RC) Catalog (Bursov+ 1989) J/A+AS/87/1 : RATAN-600 7.6 cm radio sources catalog (Parijskij+ 1991) J/other/BSAO/40.128 : RATAN-600 radio sources spectra (Bursov 1996) J/other/BSAO/40.5 : RATAN-600 RC radio sources (Parijskij+ 1996) J/A+A/370/78 : RATAN-600 NCP bright radio sources (Mingaliev+, 2001) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq [1/400]+ Sequential number 5- 14 A10 --- RC Name of the source in the RC catalogue derived from the coordinates for the epoch J2000 16 A1 --- n_RC [cn] Corrected or new spectrum (1) 18- 19 I2 h RAh Right ascension (1950) 21- 22 I2 min RAm Right ascension (1950) 24- 28 F5.2 s RAs Right ascension (1950) 30 A1 --- DE- Declination sign 31- 32 I2 deg DEd Declination (1950) 34- 35 I2 arcmin DEm Declination (1950) 37- 40 F4.1 arcsec DEs Declination (1950) 42- 47 F6.2 arcmin Shift Shift in height {DELTA}h from the centre of the antenna beam 48 A1 --- l_S3.9cm Limit flag on S3.9cm 49- 52 I4 mJy S3.9cm ? Flux density at λ3.9cm (7GHz) 53 A1 --- n_S3.9cm [n] n: Flux values is lacking 54- 56 I3 mJy e_S3.9cm ? rms uncertainty on S3.9cm 57 A1 --- l_S7.6cm Limit flag on S7.6cm (3.9GHz) 58- 61 I4 mJy S7.6cm ? Flux density at λ7.6cm 62 A1 --- n_S7.6cm [n] n: Flux values is lacking 63- 65 I3 mJy e_S7.6cm ? rms uncertainty on S7.6cm 66 A1 --- l_S13.0cm Limit flag on S13.0cm 67- 70 I4 mJy S13.0cm ? Flux density at λ13.0cm (2.3GHz) 71 A1 --- n_S13.0cm [n] n: Flux values is lacking 72- 74 I3 mJy e_S13.0cm ? rms uncertainty on S13.0cm 76 A1 --- l_S31.0cm Limit flag on S31.0cm 77- 80 I4 mJy S31.0cm ? Flux density at λ31.0cm (0.96GHz) 81 A1 --- n_S31.0cm [n] n: Flux values is lacking 82- 84 I3 mJy e_S31.0cm ? rms uncertainty on S31.0cm 86- 90 F5.2 --- SI ? Calculated spectral index from λλ7.6-31.0cm 92-100 A9 --- Spectrum Type of the source spectrum (2)
Note (1): n: sources with the spectra obtained for the first time c: sources with revised or corrected spectra For the rest of the sources, spectra was added Note (2): Types from the classification of Kellerman (1974, in, Galactic and Extragalactic Radio Astronomy, ed: G.L. Verschuur and K.I. Kellerman, Springer-Verlag, berlin, Heildelberg, New-York, 320.). S: linear power-law spectra associated with extended optically thin radio sources. C-: The spectrum has a negative second derivative of the dependence logS-logν and is more steep at the short wavelengths. Such spectra are also assigned to extended radio sources Cmax: The power spectrum (class S) or dual power spectrum (class C-) at short waves, but there is a sharp cut off at the long wavelengths. Such spectra are produced by compact optically thick sources. C+: The spectrum has positive curvature with a rise at the long or the short wavelengths. CPX: Complex spectra with one or more minima. The spectra are generally believed to be composed of two or more spectra of class Cmax plus, in some case, of class S. The spectra of this class are also assigned to compact optically thick objects. F: Flat spectra
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 16-Nov-1998
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

catalogue service

© UDS/CNRS

Contact