==========================================================================
VIII/104 SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021)
The following files can be converted to FITS (extension .fit or fit.gz)
spectra.dat waste.dat beam.dat ghzbreak_cand.dat mhzbreak_cand.dat
figa2.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VIII/104
==========================================================================
drwxr-xr-x 112 cats archive 4096 Nov 7 15:27 [Up]
drwxr-xr-x 11 cats archive 4096 Jun 29 2023 [TAR file]
-rw-r--r-- 1 cats archive 530 Jun 29 2023 .message
-r--r--r-- 1 cats archive 15047 Oct 29 2021 ReadMe
-rw-r--r-- 1 cats archive 1971 Jun 29 2023 +footg5.gif
-rw-r--r-- 1 cats archive 7967 Jun 29 2023 +footg8.gif
-r--r--r-- 1 cats archive 25518 Sep 14 2020 beam.dat [txt] [txt.gz] [fits] [fits.gz] [html]
drwxr-xr-x 2 cats archive 89 Oct 30 2021 css
-rw-r--r-- 1 cats archive 956 Oct 29 2021 custom.htx
drwxr-xr-x 2 cats archive 51 Oct 27 2021 figa2
-r--r--r-- 1 cats archive 821 Oct 29 2021 figa2.dat [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 863 Apr 20 2010 flags.htx
-r--r--r-- 1 cats archive 820110 Apr 14 2021 ghzbreak_cand.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
drwxr-xr-x 2 cats archive 49 Oct 30 2021 js
-r--r--r-- 1 cats archive 4496885 Jun 23 2021 mhzbreak_cand.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 49097555 Jan 11 2021 spectra.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 16802153 Jan 11 2021 waste.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe :VIII/104 SPECFIND V3.0 Catalog of radio continuum spectra (Stein+, 2021)
================================================================================
The SPECFIND V3.0 catalog of radio continuum cross-identifications and spectra:
Reaching lower frequencies.
Stein Y., Vollmer B., Boch T., Landais G., Vannier P., Brouty M.,
Allen M.G., Derriere S., Ocvirk P.
<Astron. Astrophys., 655, A17 (2021)>
=2021A&A...655A..17S
=2020yCat.8104....0S
================================================================================
ADC_Keywords: Radio sources ; Galaxies, radio ; Radio continuum
Keywords: catalogs - radio continuum: general -
astronomical data bases: miscellaneous
Abstract:
Many radio continuum catalogs with different sensitivity limits and
spatial resolutions are published via the VizieR database. Because of
the diversity of spatial resolution, the cross-identification of
individual sources is complex. By assuming a power-law spectrum, the
SPECFIND tool is able to handle radio surveys at different frequencies
from different instruments and different resolutions.
Since the former version of the SPECFIND catalog was released ten
years ago, hundreds of new radio continuum catalogs have been
published. We upgraded the SPECFIND tool to reach a wider frequency
range, especially the lower-frequency radio regime, as well as to have
better spatial sky coverage.
We adapted special selection criteria to all radio tables listed in
VizieR to define a final sample of new catalogs. We implemented the
new catalogs into the SPECFIND tool by unifying them and then compare
the results to the last version. Furthermore we present and
investigate sources with spectral breaks around 1.4GHz and around
325MHz.
By increasing the number of implemented SPECFIND catalogs from 115 to
204, we improve the number of resulting spectra from 107500 to 340000
and increase the number of cross-identified sources from 600000 to 1.6
million. Furthermore, we present two samples of spectral break
sources. The first sample includes 3104 spectral break sources with
turnover frequencies around 1.4GHz, the second sample includes 18075
spectral break sources with turnover frequencies around 325MHz. Both
samples include concave sources and Gigaherz-Peaked Spectrum (GPS) or
Megaherz-Peaked Spectrum (MPS) sources.
The SPECFIND V3.0 catalog is a very useful resource and a powerful
open access tool, reachable via VizieR. By tripling the resulting
spectra and including many radio continuum surveys from the last 50
years, we provide a significantly extended catalog of cross-identified
radio continuum sources. Furthermore, the SIMBAD database will be
updated using the SPECFIND V3.0 catalog and will contain more radio
continuum data, serving the needs of future projects.
Description:
We present a new version of SPECFIND. The SPECFIND tool was
successfully upgraded from 115 catalogs in version 2.0 to version 3.0
with a final number of 204 processed catalogs. 89 new catalogs were
ingested and two catalogs were updated. The final number of resulting
spectra was increased more than a factor of three from 107500 in
version 2.0 to 340000 in version 3.0. The number of objects with
cross-identified sources was more than doubled from 600000 in version
2.0 to 1.6 million in version 3.0.
The main result is presented in table "spectra" with every radio
continuum source having one entry row. The different objects/spectra
are named by different sequence numbers (column "Seq"). All radio
continuum sources with the same sequence number belong to the same
object/spectrum. In the second column, the name of the source is given
followed by the number of sources within the spectrum ("N"). The
columns "a" and "b" are the spectral index and the abscissa of the
spectral fit, respectively. The sixth column contains the frequency of
the catalog, followed by the flux density, its error and the position
of the source (Right Ascension and Declination). The column "SED" is a
link to the spectral fit, i.e. the spectrum containing this source.
The next column "Aladin" shows an Aladin Lite6 view of the source. The
last column gives the beam size of the observation.
The "beam" table contains all 204 tables from the VizieR catalogs
which were used in SPECFIND V3.0.
The "waste" table has the same general structure as "spectra", but
contains measurements which were cross-identified by position but did
not match the power-law spectrum. These points are added to the VizieR
SED plot.
The spectral break sources are provided in two different tables. The
first table contains all 5515 spectral break sources including the 210
concave sources with turnover frequencies around 1.4GHz. The second
table lists the 19691 spectral break sources including the 900 concave
sources with turnover frequencies around 325MHz. The structure of the
tables is similar to the spectra table. The first column gives the
running number "Seq". The sources belonging to the same spectrum have
the same sequence number. The second column provides the source name;
the third column the type (spectral break (sb), concave (conc),
GPS/MPS (gps/mps), GGPS/GMPS (ggps/gmps)), followed by the spectral
slope and the abscissa associated with the source. In the next column,
the mean spectral slope of the part of the spectrum (lower or higher
frequency part) is given. Then the frequency, the flux density and its
error are listed. Lastly, the position (Right Ascension and
Declination) and the beam/resolution are specified.