CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources

By S. E. Healey, R. Romani, G. Taylor, E. Sadler, R. Ricci, T. Murphy, J. Ulvestad, J. Winn. 2007

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We have assembled an 8.4 GHz survey of bright, flat-spectrum (α > -0.5) radio sources with nearly uniform extragalactic (|b| > 10°) coverage for sources brighter than S4.8 GHz = 65 mJy. The catalog is assembled from existing observations (especially CLASS and the Wright et al. PMN-CA survey), augmented by reprocessing of archival VLA and ATCA data and by new observations to fill in coverage gaps. We refer to this program as CRATES, the Combined Radio All-Sky Targeted Eight GHz Survey. The resulting catalog provides precise positions, subarcsecond structures, and spectral indices for some 11,000 sources. We describe the morphology and spectral index distribution of the sample and comment on the survey's power to select several classes of interesting sources, especially high-energy blazars. Comparison of CRATES with other high-frequency surveys also provides unique opportunities for identification of high-power radio sources.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c0c57259aef22a491c5598baa3f28c18f86b1bf2

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Citations in the corpus

Complex Faraday depth structure of active galactic nuclei as revealed by broad‐band radio polarimetry (2012, background): “It is classified as a flat-spectrum radio quasar (e.g. Healey et al. 2007), is significantly polarized (1–2 per cent level) at 5, 8 and 20 GHz (Massardi et al. 2008) and is highly polarized (>3 per cent) in the optical (Véron-Cetty & Véron 2006).”
THE LUMINOSITY FUNCTION OF FERMI-DETECTED FLAT-SPECTRUM RADIO QUASARS (2011, background): “Among these catalogs, the most important ones are the Combined Radio All-sky Targeted Eight GHz Survey (CRATES; Healey et al. 2007), the Candidate Gamma-Ray Blazar Survey (CGRaBS; Healey et al. 2008), and the Roma-BZCAT (Massaro et al. 2009), which is a catalog of blazars identiﬁed at all…”
THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2015, background): “Tentative classifications: BCU—blazar candidates of uncertain type: these are considered candidate blazars because the association methods (see Sections 3.2.1 and 3.2.2) select a candidate counterpart that satisfies at least one of the following conditions: (a) a BZU object (blazar of uncertain/tran”
Planck2013 results. XXVIII. ThePlanckCatalogue of Compact Sources (2013, background): “…(2) in the southern hemisphere, the Australia Telescope 20 GHz survey (AT20G; Murphy et al. 2010); (3) in the northern hemisphere, where no large-area survey at similar frequencies to AT20G is available, the 8.4 GHz Combined Radio All-sky Targeted Eight GHz Survey (CRATES; Healey et al. 2007).”
The VLBA Imaging and Polarimetry Survey at 5 GHz (2006, background): “In preparation for theFermimission, an all-sky catalogue of compact radio sources, the Combined Radio All-sky Targeted Eight gigaHertz Survey (CRATES;Healey et al.(2007)) containing over 11,000 sources was established.”
THE BARYON OSCILLATION SPECTROSCOPIC SURVEY OF SDSS-III (2012, background): “• BLAZGRFLAT: about 175 blazar candidates detected with Fermi and the Combined Radio All-Sky Targeted Eight GHz Survey (CRATES; Healey et al. 2007).”
Planck2015 results: XXVI. The SecondPlanckCatalogue of Compact Sources (2015, neutral): “…where no largearea survey at similar frequencies to AT20G is available, the 8.4 GHz Combined Radio All-sky Targeted Eight GHz Survey (CRATES; Healey et al. 2007), a compilation of flat-spectrum (α > −0.5) radio sources with nearly uniform extragalactic (|b| > 10◦) coverage for sources…”
Fermi Large Area Telescope Fourth Source Catalog (2019, neutral): “…catalog 12319 D’Abrusco et al. (2014) Radio Fundamental Catalog (2019a) 15740 http://astrogeo.org/rfc CGRaBS 1625 Healey et al. (2008) CRATES 11499 Healey et al. (2007) ATCA 20 GHz southern sky survey 5890 Murphy et al. (2010) 105 month Swift/BAT catalog 1632 Oh et al. (2018) 4th IBIS catalog…”
Roma-BZCAT: A multifrequency catalogue of Blazars (2008, methodology): “This sample is essentially based on the CRATES (Combined Radio All-Sky Targeted Eight GHz Sources) catalogue (Healey et al. 2007), which extended the CLASS (Cosmic Lens All-Sky Survey, Myers et al. 2003) to obtain observations at 8.4 GHz of flat spectrum sources with |b| > 10◦ and brighter than 65…”
SEARCHING FOR DARK MATTER ANNIHILATION IN RECENTLY DISCOVERED MILKY WAY SATELLITES WITH FERMI-LAT (2016, background): “We also investigated associations with sources observed at other wavelengths that are potential γ-ray emitters in the BZCAT (Massaro et al. 2009), CRATES (Healey et al. 2007), CGraBS (Healey et al. 2008), PMN (Wright et al. 1994), and WISE blazar candidate (D’Abrusco et al. 2014) catalogs.”
THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (2010, background): “The most important ones are the Combined Radio Allsky Targeted Eight GHz Survey (CRATES; Healey et al. 2007), the Candidate Gamma-Ray Blazar Survey (CGRaBS; Healey et al. 2008), and the Roma-BZCAT (Massaro et al. 2009).”
THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV (2014, result): “Additionally, we add a template for a source at the position of CRATES J231012−051421 (Healey et al. 2007) after a localized excess in the residual map was found in a first iteration of this analysis at a position consistent with the CRATES source.”
CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates (2007, background): “Healey et al. (2007) have recently developed such a catalog, CRATES, which extended results of the Cosmic Lens All-Sky Survey (CLASS; Myers et al. 2003) to obtain 8.4 GHz observations of all jbj> 10 objects brighter than 65 mJy at 4.8 GHz with spectral indices > 0:5 (where S / ).”
BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY (2009, methodology): “The Figure-of-Merit Method200 The figure of merit (FoM) approach requires a large, uniform all-sky sample of radio sources201 from which to draw; for this purpose, we use the Combined Radio All-Sky Targeted Eight GHz Sur-202 vey (CRATES; Healey et al. 2007) catalog.”