J/other/BSAO/40.128 RATAN-600 radio sources spectra (Bursov 1996)
Spectra of radio sources of the program "Cold" at the RATAN-600 radiotelescope
Bursov N.N
<Bull. Special Astrophys. Obs., 40, 128 (1996)>
=1996BSAO...40..128B 1996BSAO...40..128B (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Spectroscopy
Keywords: radio sources: catalog - spectra
Abstract:
In accordance with the program "Cold" in 1987-1988 and in 1996 deep
surveys of the sky strip at the declination of the source SS 433
(δ∼5°±20') were made at the radio telescope RATAN-600. For
the first time spectral characteristics of 400 sources from the RC
catalog have been determined using only the data obtained with the
RATAN-600. The maximum of the flux density distributions at the
central wavelength λ7.6cm is ∼30mJy. The lower flux limit in
the sample of the sources at the wavelengths 3.9, 7.6, 13.0, 31.0cm is
16, 9, 37, 61mJy, respectively. Spectra of 112 sources (28%) have been
obtained for the first time, spectra of 90 (23%) sources have been
made more accurate. For the first time the fluxes at the wavelengths
2.7, 3.9, 13.0 and 31.0cm (90% of data) have been measured. The
maximum of the distribution of spectral indices for the entire sample
of sources in the interval λλ7.6-31.0cm falls at
α=-0.86±0.04 (Sν∝νalpha). About 20 (5%)
sources of the sample have a maximum of radiation at a frequency of
about 1GHz (GHz-Peaked-Spectrum radio sources), about 40 (10%) have a
low-frequency cut off of the spectrum. About 70 (19%) sources have
flat spectra (α>-0.5), 64 (18%) very steep (α←1.1)
spectra.
Remarks:
Almost the same source list has also been published in Astron. Zh.
(1997AZh....74....1B 1997AZh....74....1B = 1997ARep...41...35B 1997ARep...41...35B).
There is some overlap of the above source lists with the list
published in Astron. Astrophys. Suppl. 101 by Bursov et al.
"Radio Spectra of RATAN-600 RC catalog sources" (1993A&AS..101..447B 1993A&AS..101..447B)
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 108 400 Flux densities of RC catalog radio sources
--------------------------------------------------------------------------------
See also:
VIII/33 : Spectral characteristics of RATAN (RC) Catalog (Bursov+ 1989)
J/A+AS/87/1 : RATAN-600 7.6 cm catalog of radio sources (Parijskij+ 1991)
J/AZh/62/229 : Giant H II region Ratan-600 obs. (Berlin+ 1985)
J/A+A/370/78 : RATAN-600 NCP bright radio sources (Mingaliev+, 2001)
J/other/BSAO/40.5 : RATAN-600 RC radio sources (Parijskij+ 1996)
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 [nc] Note on the sources (1)
18- 19 I2 h RAh Right ascension (1950.0)
21- 22 I2 min RAm Right ascension (1950.0)
24- 28 F5.2 s RAs Right ascension (1950.0)
30 A1 --- DE- Declination sign
31- 32 I2 deg DEd Declination (1950.0)
34- 35 I2 arcmin DEm Declination (1950.0)
37- 40 F4.1 arcsec DEs Declination (1950.0)
42- 47 F6.2 arcsec Dh Elevation drift of the source from the centre
of the beam of the radiotelescope
49- 52 I4 mJy S2.7cm ? Flux density at λ2.7cm (11GHz)
53 A1 --- n_S2.7cm [n] n: Flux values is lacking
54- 55 I2 mJy e_S2.7cm ? rms uncertainty on S2.7cm
56 A1 --- l_S3.9cm Limit flag on S3.9cm
57- 60 I4 mJy S3.9cm ? Flux density at λ3.9cm (7.69GHz)
61 A1 --- n_S3.9cm [n] n: Flux values is lacking
62- 64 I3 mJy e_S3.9cm ? rms uncertainty on S3.9cm
65 A1 --- l_S7.6cm Limit flag on S7.6cm
66- 69 I4 mJy S7.6cm ? Flux density at λ7.6cm (3.94GHz)
70 A1 --- n_S7.6cm [n] n: Flux values is lacking
71- 73 I3 mJy e_S7.6cm ? rms uncertainty on S7.6cm
74 A1 --- l_S13.0cm Limit flag on S13.0cm
75- 78 I4 mJy S13.0cm ? Flux density at λ13.0cm (2.3GHz)
79 A1 --- n_S13.0cm [n] n: Flux values is lacking
80- 82 I3 mJy e_S13.0cm ? rms uncertainty on S13.0cm
83 A1 --- l_S31.0cm Limit flag on S31.0cm
84- 87 I4 mJy S31.0cm ? Flux density at λ31.0cm (0.96GHz)
88 A1 --- n_S31.0cm [n] n: Flux values is lacking
90- 92 I3 mJy e_S31.0cm ? rms uncertainty on S31.0cm
94- 98 F5.2 --- SI ? Calculated spectral index in the wavelength
interval λλ76-31.0cm
100-112 A13 --- 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: The straight power assigned to extended optically thin synchrotron
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] 25-Aug-1998