Access to Astronomical Catalogues

← Click to display the menu
VIII/86        Analysis of the RC catalog sample.    (Zhelenkova+ 2008-2009)

Analysis of the RC catalog sample in the region overlapping with the regions of the FIRST and SDSS surveys: I. Identification of sources with the VLSS, TXS, NVSS, FIRST, and GB6 catalogs. II. Optical identification with the SDSS survey and USNO-B1 and 2MASS catalogs. Zhelenkova O.P., Kopylov A.I. <Astrophys. Bull. 63, 346 (2008); 64, 109 (2009)> =2008AstBu..63..346Z =2009AstBu..64..109Z
ADC_Keywords: Radio continuum ; Radio sources ; Surveys Keywords: radio continuum: general - surveys - radio sources: general - radio sources: identifications Description: Part 1 contains parameters in 74-4850MHz frequency range for 320 radio sources of the RC catalog. After visual inspection of the sample on images of the NVSS and FIRST surveys we defined morphological type, number of FIRST counterparts of each source and angular size for multi-components sources, also refined coordinates of the RC catalog sources. We used GB6 images for flux density estimations of weak sources of our sample. Two-frequency spectral indices are also presented. Part 2 contains results of optical identification of the 320 radio sources of the RC catalog with the SDSS survey. We visually identified FIRST and SDSS data based on refined coordinates and morphological types of the RC catalog sample from paper 1 (part1). We searched the literature, NED and SDSS databases to find data about type of optical candidates, their spectral redshifts, partially photometric redshifts, estimated likelihood ratio and likelihood ratio cut-off for the objects. Abstract of paper I: 432 radio sources of the RC catalog produced in 1980-1985 at RATAN-600 radio telescope based on a deep survey of a sky strip centered on the declination of the SS433 source are identified in the region overlapping with FIRST and SDSS surveys (about 132°2 large). The NVSS catalog was used as the reference catalog for refining the coordinates of the radio sources. The morphology is found for about 75% of the objects of the sample and the ratio of single, double and multicomponent radio sources is computed based on FIRST radio maps. The 74, 365, 1400, and 4850MHz data of the VLSS, TXS, NVSS, FIRST, and GB6 catalogs are used to analyze the shape of the spectra. Abstract of paper II: We report the results of optical identification of a sample of RC catalog radio sources with the FIRST and SDSS surveys. For 320 sources identified with NVSS and FIRST objects we perform optical identification with the SDSS survey. When selecting optical candidates we make maximum use of the information about the structure of radio sources as provided by the FIRST survey images. We find optical candidates for about 70% of all radio sources. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file part1.dat 185 320 Parameters of 320 radio sources of RATAN catalog part2.dat 243 320 Results of optical identifications
See also: VIII/33 : RATAN (RC) Catalog spectral characteristics (Bursov+ 1989) VIII/40 : GB6 catalog of radio sources (Gregory+ 1996) VIII/42 : Texas Survey of radio sources at 365MHz (TXS) (Douglas+ 1996) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VIII/71 : FIRST Survey Catalog (FIRST) (Becker+ 2003) VIII/79 : VLA Low-frequency Sky Survey at 74MHz (VLSS) (Cohen+ 2007) II/282 : SDSS Photometric Catalog Release 6 (Adelman-McCarthy+ 2007) J/A+AS/87/1 : RATAN-600 7.6cm catalog of radio sources (Parijskij+ 1991) J/AZh/72/613 : Optical identification of radio sources (Kopylov+, 1995) J/AZh/73/835 : Identifications of objects from RC Catalog (Fletcher+ 1996) J/other/BSAO/40.5 : RATAN-600 RC radio sources (Parijskij+ 1996) Byte-by-byte Description of file: part1.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [RC] 3- 13 A11 --- RC Radio source name (JHHMM+DDMMA) 15- 16 I2 h RA1h RC catalog right ascension (J2000.0) 18- 19 I2 min RA1m RC catalog right ascension (J2000.0) 21- 25 F5.2 s RA1s RC catalog right ascension (J2000.0) 27 A1 --- DE1- RC catalog declination sign (J2000.0) 28- 29 I2 deg DE1d RC catalog declination (J2000.0) 31- 32 I2 arcmin DE1m RC catalog declination (J2000.0) 34- 37 F4.1 arcsec DE1s RC catalog declination (J2000.0) 39- 43 A5 --- Rcat Source presence in NVSS (N), FIRST (F), VLSS (V), TXS (T) and GB6 (G) catalogues 45- 49 I5 mJy S74 ? 74MHz flux density from VLSS 51- 54 I4 mJy S365 ? 365MHz flux density from TXS 56- 61 F6.1 mJy S1400 1.4GHz flux density from NVSS (1) 63- 69 F7.2 mJy FIRST ? 1.4GHz flux density from FIRST (2) 71- 74 I4 mJy S3900 3.9GHz flux density from RC 76- 79 I4 mJy S4850 ? 4.85GHz flux density from GB6 81- 82 I2 h RAh Refined RC catalog right ascension (J2000.0) 84- 85 I2 min RAm Refined RC catalog right ascension (J2000.0) 87- 92 F6.3 s RAs Refined RC catalog right ascension (J2000.0) 94 A1 --- DE- Refined RC catalog declination sign (J2000.0) 95- 96 I2 deg DEd Refined RC catalog declination (J2000.0) 98- 99 I2 arcmin DEm Refined RC catalog declination (J2000.0) 101-105 F5.2 arcsec DEs Refined RC catalog declination (J2000.0) 107-108 A2 --- Fc Method of RC-source coordinates improvement (3) 110 I1 --- N ? Number of FIRST components composing a source 112-114 A3 --- MT Morphological type (4) 116-117 A2 --- n_MT [agtx? ] Additional notes to MT column (5) 119-124 F6.2 arcsec LAS ? Largest angular size (6) 126-130 F5.2 --- VT ? Spectral index in 74-365MHz range, S∝nu 132-136 F5.2 --- TN ? Spectral index in 365-1400MHz range 138-142 F5.2 --- NG ? Spectral index in 1.4-4.85GHz range 144-149 F6.2 arcmin DHrc Relative elevation of the RC radio source with respect to a central part of the RATAN-600 beam pattern 151-156 F6.2 arcmin DHc Corrected relative elevation (on 15.04.1980) from a refined position of the RC radio source with respect to a central part of the RATAN-600 beam pattern 158-161 I4 mJy S3900c 3.9GHz flux density corrected for DHc 163-166 I4 mJy S4850g ? 4.85GHz flux density with estimations from the GB6 survey maps 168-169 A2 --- n_S4850g [:?+ ] Comments to the S4850g column (7) 171-174 A4 --- Sp [IFSU±: ] Spectrum behavior on ranges 74-365MHz, 365-1400MHz, 1400-4850MHz (8) 176-179 A4 --- Stype [IFSUgd: ] Spectrum type according to the fgrep program approximation by parabola and the Sp column (8) 181-182 A2 --- 1S [1S ] marks source belonging to the first (1S) sample 184-185 A2 --- 2S [2S ] marks source belonging to the second (2S) sample
Note (1): Flux densities for unresolved in RC catalog double NVSS sources are summed Note (2): Flux densities for unresolved in NVSS survey multi-components FIRST sources are summed Note (3): Method of position refinement use the following catalogues: F = coordinates taken from FIRST catalogue (Cat. VIII/71) N = coordinates taken from NVSS catalogue (Cat. VIII/65) Fm = coordinates taken from FIRST images (Cat. VIII/71) Note (4): Morphological characteristics as follows: C = core CJ = core-jet CL = core-lobe D = double DD = double-double DC = double-core T = triple M = multi-component E = extended Note (5): Additional notes as follows: a = asymmetry g = group of sources (FIRST data) t = two radio sources nearby x = like X-shaped Note (6): For unresolved FIRST sources it is MaJAxis parameter, for others distance between the farthest FIRST components Note (7): Comments as follows: : = estimation of flux density by GB6 survey map + = reliable estimation ? = when re-count 1.4GHz flux density to 4.85GHz with spectral index 0.7 we got other then GB6 value Note (8): Spectrum behavior codes as follows: I = sp.index←0.1 F = -0.1≤sp.index<0.5 S = 0.5≤sp.index<1.0 U = sp.index≥1.0. + = marks increasing of the spectral index when transition from range to range - = marks decreasing of the spectral index when transition from range to range g = gibbous shape spectrum d = dished shape spectrum
Byte-by-byte Description of file: part2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [RC] 3- 13 A11 --- RC Radio source name (JHHMM+DDMMA) 15- 16 A2 --- QI Quality of optical identification (1) 18- 21 A4 --- Ocat Optical candidate is present in SDSS (S), USNO-B1 (U), 2MASS (2) surveys or observed on the 6-m telescope (B) 23- 24 I2 h RAh Refined RC catalog right ascension (J2000.0) 26- 27 I2 min RAm Refined RC catalog right ascension (J2000.0) 29- 34 F6.3 s RAs Refined RC catalog right ascension (J2000.0) 36 A1 --- DE- Refined RC catalog declination sign (J2000.0) 37- 38 I2 deg DEd Refined RC catalog declination (J2000.0) 40- 41 I2 arcmin DEm Refined RC catalog declination (J2000.0) 43- 47 F5.2 arcsec DEs Refined RC catalog declination (J2000.0) 49- 50 I2 h RAo.h ? Optical candidate right ascension (J2000.0) 52- 53 I2 min RAo.m ? Optical candidate right ascension (J2000.0) 55- 59 F5.2 s RAo.s ? Optical candidate right ascension (J2000.0) 61 A1 --- DEo.- Optical candidate declination sign (J2000.0) 62- 63 I2 deg DEo.d ? Optical candidate declination (J2000.0) 65- 66 I2 arcmin DEo.m ? Optical candidate declination (J2000.0) 68- 71 F4.1 arcsec DEo.s ? Optical candidate declination (J2000.0) 73- 90 A18 --- SDSS ? SDSS object identifier 92- 95 A4 --- Type Object type by NED/SDSS data (2) 97-103 A7 --- TypeS SDSS object type 105-109 F5.2 mag umag ? SDSS model magnitude filter u 111-115 F5.2 mag gmag ? SDSS model magnitude filter g 117-121 F5.2 mag rmag ? SDSS model magnitude filter r 123-127 F5.2 mag imag ? SDSS model magnitude filter i 129-133 F5.2 mag zmag ? SDSS model magnitude filter z 135-139 F5.2 mag umag0 ? SDSS de-redden magnitude filter u 141-145 F5.2 mag gmag0 ? SDSS de-redden magnitude filter g 147-151 F5.2 mag rmag0 ? SDSS de-redden magnitude filter r 153-157 F5.2 mag imag0 ? SDSS de-redden magnitude filter i 159-163 F5.2 mag zmag0 ? SDSS de-redden magnitude filter z 165-168 F4.2 mag e_umag ? SDSS magnitude error filter u 170-173 F4.2 mag e_gmag ? SDSS magnitude error filter g 175-178 F4.2 mag e_rmag ? SDSS magnitude error filter r 180-183 F4.2 mag e_imag ? SDSS magnitude error filter i 185-188 F4.2 mag e_zmag ? SDSS magnitude error filter z 190-193 F4.2 arcsec Size ? SDSS angular size of an optical candidate 195-198 F4.2 --- zsp ? Spectral redshift (SDSS/NED data) 200-203 F4.2 --- zph ? SDSS photometric redshift (with template spectra) 205-208 F4.2 --- e_zph ? SDSS photometric redshift error 210 I1 --- q_zph ? Quality of photometric redshift approximation 212-217 F6.2 arcsec oRA ? Difference between radio and optical right ascensions 219-223 F5.2 arcsec oDE ? Difference between radio and optical declinations 225-229 F5.2 arcsec r ? Distance between radio and optical positions 231-235 F5.2 --- R ? Normalized distance between radio and optical positions 237-243 F7.2 --- LR ? Likelihood ratio
Note (1): Quality of optical identification flag as follows: EF = empty field + = reliable ? = possible identification * = an optical object offsets from the position supposed by a radio source structure Note (2): Object type in one of the 4 categories: GAL = galaxy QSO = quasar STAR = star-like object ? = doubtful
Acknowledgements: Olga Zhelenkova, zhe(at)sao.ru
(End) Olga Zhelenkova [SAO, Russia], Patricia Vannier [CDS] 04-Jun-2009
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