VIII/85A SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)
A method for determining radio continuum spectra, and its application
to large surveys
Vollmer B.
<Astron. Astrophys. 511, 53 (2010)>
=2010A&A...511A..53V 2010A&A...511A..53V
ADC_Keywords: Radio sources ; Galaxies, radio ; Radio continuum
Keywords: astronomical data bases: miscellaneous - radio continuum: general
Description:
This is the second release of the SPECFIND catalogue. For the radio
cross-identification we included 3.76 million sources from 105 VizieR
radio catalogues. The SPECFIND V2.0 catalogue contains about 107000
physical objects with associated radio spectra. With an increase of 8%
of available sources with respect to the first release, we could
increase the number of radio objects by 60%.
The results of the spectrum identification process are provided as a
master table, where a spectrum is attached to each radio source. Due
to the SPECFIND algorithm, different radio sources of the same
physical object can have somewhat different slopes and zero-points.
We also present radio sources from positional cross-identification
only taking into account the source extent and the survey resolution
(overlapping beams or extents). The source flux densities were not
taken into account as it was done for the SPECFINDV2.0 catalogue. In
this sense, it represents the waste basket of SPECFINDV2.0.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spectra.dat 124 631736 The parameters of the radio spectra
waste.dat 114 1497216 Source parameters based on positional cross-id
beam.dat 90 115 Characterisation of catalogues in SPECFIND
simbadz.dat 86 107488 Redshifts from Simbad database (November 2015)
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See also:
VIII/13 : A new catalog of 53522 4.85GHz sources (BWE) (Becker+ 1991)
VIII/14 : 87GB Catalog of radio sources (Gregory et al., 1991)
VIII/15 : Parkes Radio Sources Catalogue (PKS) (Wright+ 1990)
VIII/16 : Molonglo Reference Catalogue of Radio Sources (MRC) (Large+ 1991)
VIII/17 : The North 20cm Survey (WB) (White+ 1992)
VIII/36 : The Second Bologna Survey (B2) (Colla+ 1970-1974)
VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)
VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996)
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
VIII/42 : Texas Survey of radio sources at 365MHz (TXS) (Douglas+ 1996)
VIII/44 : Miyun 232MHz survey (MIYUN) (Zhang+ 1997)
VIII/52 : The MIT-Green Bank 5GHz Survey (Bennett+, 1986-91)
VIII/60 : Interferometer phase calibration sources (JVAS) (Patnaik+ 1998)
VIII/62 : The Westerbork Northern Sky Survey (WENSS) (Leiden, 1998)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/69 : The WISH catalogue at 352 MHz (de Breuck+ 2002)
VIII/70 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
J/A+AS/85/805 : 11cm radio continuum survey. IV. (F3R) (Fuerst+ 1990)
Byte-by-byte Description of file: spectra.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Seq [1,107498] Sequential number of the spectrum (1)
8- 38 A31 --- Name Main name of the radio source (G1)
40- 41 I2 --- N [2,31] Number of points in spectrum
43- 48 F6.2 --- a Slope of spectrum (3)
50- 55 F6.2 [mJy] b Abscissa of spectrum (3)
57- 61 I5 MHz nu [30,15000] Frequency
63- 71 E9.3 mJy S(nu) Flux density at frequency nu
73- 80 E8.2 mJy e_S(nu) Mean error on S(nu)
82- 89 F8.4 deg RAdeg Right ascension (J2000) of source
91- 98 F8.4 deg DEdeg Declination (J2000) of source
100-108 E9.3 mJy dFlux Difference with flux expected from NVSS
110-116 F7.1 arcsec dRA Offset in RA from NVSS source
118-124 F7.1 arcsec dDE Offset in DE from NVSS source
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Note (1): This number relates the sources that contribute to a single
spectrum, i.e. there are N radio sources sharing the same Seq number.
The number of independent spectra is 107498.
Note (3): The coefficients of a and b of the flux density parametrization
log(S(ν)) = a.log(ν) + b
where the log is decimal (log10), S expressed in mJy and ν in
MHz. Thus b represents log(S(1MHz)/1mJy).
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Byte-by-byte Description of file: waste.dat
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Bytes Format Units Label Explanations
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1- 31 A31 --- Assoc Main name of the radio association (G1)
32- 38 I7 --- Seq [-272182,107498] Spectrum Sequential number (1)
40- 45 I6 MHz nu [30,15000] Frequency
47- 55 E9.3 mJy S(nu) Flux density at frequency nu
57- 64 E8.2 mJy e_S(nu) Mean error on S(nu)
66- 73 F8.4 deg RAdeg Right ascension (J2000) of source
75- 82 F8.4 deg DEdeg Declination (J2000) of source
84-114 A31 --- Name Name of the associated radio source (G1)
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Note (1): when positive, the radio flux matches a spectrum and is therefore
also included in the "spectra.dat" file; when negative, the flux does
not match a spectrum.
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Byte-by-byte Description of file: beam.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Catalog abbreviation used in SPECFIND (G1)
13 A1 --- I [IS-] interferometer or Single dish
16- 20 I5 MHz nu [30,15000] Frequency
21- 22 A2 --- --- [. ]
24- 30 F7.4 arcmin beam Beam size
32- 37 F6.1 mJy Smin ? Sensitivity limit
39- 45 I7 --- N Number of sources in catalog
47- 50 F4.1 % sp ? Percentage of sources having a spectrum
52- 70 A19 --- BibCode Reference's bibcode
72- 90 A19 --- Cat Catalog acronyms in VizieR
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Byte-by-byte Description of file: simbadz.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Seq [1/107498]
8- 35 A28 --- SName Simbad name
37- 52 A16 --- SType Simbad object type
54- 63 F10.7 --- z ? Simbad redshift
65- 77 A13 --- n_z Simbad nature redshift
79- 86 F8.6 --- e_z ? rms uncertainty on z
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Global Notes:
Note (G1): a summary of the acronyms used, with indication of interferometric
or single dish instrumentation, frequency, resolution, sensitivity
limit (mJy), number of sources, percentage of sources with identified
spectrum, and the identification of the catalog in the CDS collection
is given as file "beam.dat". To distinguish sources of the same survey
observed at different frequencies, we added a lowercase letter to the
source acronym (e.g. FORa, FORb).
History:
* 27-Jan-2009: First version, with 551852 records (66985 spectra)
* 06-Jul-2009: Second version (A), with addition of "waste.dat" file
* 04-Dec-2015: File simbadz.dat added
(End) Bernd Vollmer, Francois Ochsenbein [CDS] 06-Jul-2009