J/other/AstBu/65.42 RCR (RATAN COLD REFINED) catalogue (Soboleva+, 2010)
Ratan-600 7.6-cm Deep Sky Strip Surveys at the declination of the SS433 source
during the 1980-1999 period. Data reduction and the catalog of radio sources in
the right ascension interval 7h≤R.A.≤17h.
Soboleva N.S., Majorova E.K., Zhelenkova O.P., Temirova A.V., Bursov N.N.
<Astrophys. Bull., 65, 42 (2010)>
=2010AstBu...65..42S
ADC_Keywords: Surveys ; Radio continuum ; Radio sources
Keywords: radio continuum: general - surveys - radio sources: general -
radio sources: identifications
Abstract:
We use two independent methods to reduce the data of the surveys made
with RATAN-600 radio telescope at 7.6cm in 1988-1999 at the
declination of the SS433 source. We also reprocess the data of the
"Cold" survey (1980-1981). The resulting RCR (RATAN COLD REFINED)
catalogue contains the right ascensions and fluxes of objects
identified with those of the NVSS catalogue in the right-ascension
interval 7h≤RA≤17h. We obtain the spectra of the radio sources
and determine their spectral indices at 3.94 and 0.5GHz. The spectra
are based on the data from all known catalogues available from the
CATS, Vizier, and NED databases, and the flux estimates inferred from
the maps of the VLSS and GB6 surveys. For 245 of the 550 objects of
the RCR catalogue the fluxes are known are known only at two
frequencies: 3.94GHz (RCR) and 1.4GHz (NVSS). These are mostly sources
with fluxes smaller than 30mJy. About 65% of these sources have flat
or inverse spectra (alpha>-0.5). We analyse the reliability of the
results obtained for the entire list of objects and construct the
histograms of the spectral indices and fluxes of the sources. Our main
conclusion is that all 10-15mJy objects found in the considered
right-ascension interval were already included in the decimetre-wave
catalogues.
Description:
From 1980 till 1999 7 surveys of 40' width sky strip, centred on SS433
declination have been carried out on the radio telescope RATAN-600.
Observations were spent on 7.6cm wavelength in the range of right
ascensions 4h<RA<22h and on 31cm in an interval 4h<RA<13h. On
a basis of the given observations 1980-1981 on 7.6cm wavelength
(experiment "Cold") has been obtained the RC catalogue of radio
sources. Re-processing of the surveys data in the range of 7h<RA<17h
is conducted for improvement of coordinates and flux densities of the
RC catalogue sources The results of data processing by two methods
described in the paper are included in the RCR catalogue. The NVSS
catalogue was used as reference one. The RCR table includes NVSS
coordinates of sources, differences between NVSS right ascension and
right ascension obtained by the first and second method of scan data
processing, and also errors, flux density on 7.6cm or 3.9GHz (also
defined by two methods) and errors.
We fitted available flux density data by curves and obtained 3.94GHz
and 0.5GHz spectral indexes for the whole source list. At
construction of spectra in addition to the available data of known
catalogues we used estimated values of flux density obtained on the
VLSS and GB6 images. Estimated values of 4.85GHz flux density have
allowed to confirm reliability of weak objects allocation on the
scans.
In total in a strip of right ascensions 7h<RA<17h was evolved 550
objects, from them are 18 blinds and 15 double sources. All of them
are identified with objects of the NVSS catalogue.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rcr.dat 115 567 Parameters of 550 radio sources of the RCR catalog
in range between 7h and 17h of right ascension
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/A+AS/87/1 : RATAN-600 7.6 cm catalog of radio sources (Parijskij+ 1991)
J/AZh/74/42 : RATAN-600 radio sources spectra (Bursov 1997)
Byte-by-byte Description of file: rcr.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh NVSS right ascension (J2000.0)
4- 5 I2 min RAm NVSS right ascension (J2000.0)
7- 11 F5.2 s RAs NVSS right ascension (J2000.0)
13 A1 --- DE- NVSS declination sign (J2000.0)
14- 15 I2 deg DEd NVSS declination (J2000.0)
17- 18 I2 arcmin DEm NVSS declination (J2000.0)
20- 23 F4.1 arcsec DEs NVSS declination (J2000.0)
25- 42 A18 --- NVSS NVSS radio source name (HHMMSS.ss+DDMMSS.s)
44- 48 F5.2 s dRA1 ? Difference between NVSS right ascension
and right ascension obtained with the
first method of scan data processing
50- 53 F4.2 s e_dRA1 ? Error of the RA first difference
55- 59 F5.2 s dRA2 ? Difference between NVSS right ascension
and right ascension obtained with the
second method of scan data processing
61- 64 F4.2 s e_dRA2 ? Error of the RA second difference
66- 71 F6.1 mJy F3.94:1 ? 3.94GHz flux density obtained with the
first method
73- 77 F5.1 mJy e_F3.94:1 ? Error on F3.94:1
79- 84 F6.1 mJy F3.94:2 ? 3.94GHz flux density obtained with the
second method
86- 90 F5.1 mJy e_F3.94:2 ? Error on F3.94:2
92- 96 F5.2 --- SI3.94 ? 3.94GHz spectral index
98-102 F5.2 --- SI0.5 ? 0.5GHz spectral index
104-110 A7 --- Com Some comments concerning features of the
source (1)
112 A1 --- fl2 [*] "*" for source with antenna temperature
between 3 and 5 rms
115 A1 --- fl3 [#] "#" for source included only in NVSS
and RCR catalogues
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Note (1): Flags as follows:
G = flux density estimation with the GB6 images
V = flux density estimation with the VLSS images
d = double sources
b = blended sources
hill = spectral feature like a relative maximum at some frequency
GPS = Gigahertz Peaked Source
HFP = High Frequency Peak
var = variability
** = large spread of spectral data
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Acknowledgements:
Olga Zhelenkova, zhe(at)sao.ru
(End) Olga Zhelenkova [SAO, Russia], Patricia Vannier [CDS] 11-Feb-2010