J/ApJS/215/14 WISE candidate γ-ray blazar radio sources (D'Abrusco+, 2014)
The WISE blazar-like radio-loud sources:
an all-sky catalog of candidate γ-ray blazars.
D'Abrusco R., Massaro F., Paggi A., Smith H.A., Masetti N., Landoni M.,
Tosti G.
<Astrophys. J. Suppl. Ser., 215, 14 (2014)>
=2014ApJS..215...14D 2014ApJS..215...14D
ADC_Keywords: BL Lac objects ; QSOs ; Cross identifications ;
Photometry, infrared ; Radio sources
Keywords: BL Lacertae objects: general; catalogs; galaxies: active;
radiation mechanisms: non-thermal
Abstract:
We present a catalog of radio-loud candidate γ-ray emitting
blazars with WISE mid-infrared colors similar to the colors of
confirmed γ-ray blazars. The catalog is assembled from WISE
sources detected in all four WISE filters, with colors compatible with
the three-dimensional locus of the WISE γ-ray emitting blazars,
and which can be spatially cross-matched with radio sources from one
of the three radio surveys: NVSS, FIRST, and/or SUMSS. Our initial
WISE selection uses a slightly modified version of previously
successful algorithms. We then select only the radio-loud sources
using a measure of the radio-to-IR flux, the q22parameter, which is
analogous to the q24 parameter known in the literature but which
instead uses the WISE band-four flux at 22µm. Our final catalog
contains 7855 sources classified as BL Lacs, FSRQs, or mixed candidate
blazars; 1295 of these sources can be spatially re-associated as
confirmed blazars. We describe the properties of the final catalog of
WISE blazar-like radio-loud sources and consider possible
contaminants. Finally, we discuss why this large catalog of candidate
γ-ray emitting blazars represents a new and useful resource to
address the problem of finding low-energy counterparts to currently
unidentified high-energy sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 140 7855 The catalog of WISE blazar-like radio-loud sources
(WIBRaLS)
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
IX/15 : Einstein EMSS Survey (Gioia+ 1990, Stocke+ 1991)
J/ApJS/213/3 : Low-frequency flat spectrum sources (LORCAT) (Massaro+, 2014)
J/ApJS/209/10 : UGSs. V. kernel approach (Massaro+, 2013)
J/ApJS/209/9 : Unidentified gamma-ray sources. IV. X-ray (Paggi+, 2013)
J/ApJS/207/4 : Unidentified γ-ray sources. III. Radio (Massaro+, 2013)
J/ApJS/206/17 : New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)
J/ApJS/206/12 : Blazars with γ-ray counterparts. I. (D'Abrusco+, 2013)
J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013)
J/ApJS/203/15 : Counterparts to 1.4GHz sources in ECDF-S (Bonzini+, 2012)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/ApJ/748/68 : WISE IR colors of gamma-ray blazars (D'Abrusco+, 2012)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/A+A/524/A64 : The 54-month Palermo BAT-survey catalogue (Cusumano+, 2010)
J/A+A/495/691 : Multifrequency catalog of blazars, Roma-BZCAT (Massaro+, 2009)
J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007)
J/MNRAS/362/9 : Radio-loud AGN in SDSS (Best+, 2005)
J/ApJ/525/127 : RGB sample of BL Lacertae objects (Laurent-Muehleisen+, 1999)
http://www.asdc.asi.it/bzcat : The BZCAT catalog of known blazars, 5th edition
http://wise2.ipac.caltech.edu/docs/release/allwise/expsup : ALLWISE supplement
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WB]
4- 14 A11 --- WB WIBRaL catalog identifier; IAU format (JHHMM+DDMMA)
17- 35 A19 --- WISE WISE identifier (JHHMMSS.ss+DDMMSS.s)
37- 47 F11.7 deg RAdeg WISE Right Ascension in decimal degrees (J2000)
49- 59 F11.7 deg DEdeg WISE Declination in decimal degrees (J2000)
61- 64 F4.2 mag W1-W2 [0.4/1.5] WISE (3.4-4.6)um color index (1)
66- 69 F4.2 mag e_W1-W2 Uncertainty in W1-W2
71- 74 F4.2 mag W2-W3 [1.7/3.8] WISE (4.6-12)um color index (1)
76- 79 F4.2 mag e_W2-W3 Uncertainty in W2-W3
81- 84 F4.2 mag W3-W4 [1.5/3] WISE (12-22)um color index (1)
86- 89 F4.2 mag e_W3-W4 Uncertainty in W3-W4
91- 94 F4.2 --- SBZB [0/1] Score for BZB (BL Lac) region of the locus (2)
96- 99 F4.2 --- SMIX [0/1] Score for MIXED region of the locus (2)
101-104 F4.2 --- SBZQ [0/1] Score for BZQ (FSRQ) region of the locus (2)
106-110 A5 --- Type Spectral type: BZB (BL Lac), BZQ (flat spectrum
radio quiet), or MIXED
112-112 A1 --- Class [A-D] Class (A=most likely WISE blazar-like source)
114-134 A21 --- Radio Radio counterpart identifier (NVSS, SUMSS or FIRST)
136-140 F5.2 [-] q22 [-3.2/-0.5] log of 22µm to radio flux densities
q22 = log(S(22um)/S(radio))
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Note (1): Corrected for galactic extinction.
Note (2): The position of a generic WISE source relative to each of the three
distinct cylinders in the model of the locus is used to choose the
sources most likely to have the typical WISE colors for γ-ray
emitting blazars. We called the separate quantitative measure of the
compatibility of the position of a generic WISE source with each of
the three cylinders of the model the score. In general, the larger
the score values are, the closer the source is to the locus model and
the more similar the WISE colors are to the colors of confirmed
γ-ray emitting blazars. See section 2.1.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Jan-2015