J/ApJ/748/68 WISE IR colors of gamma-ray blazars (D'Abrusco+, 2012)
Infrared colors of the gamma-ray-detected blazars.
D'Abrusco R., Massaro F., Ajello M., Grindlay J.E., Smith H.A., Tosti G.
<Astrophys. J., 748, 68 (2012)>
=2012ApJ...748...68D 2012ApJ...748...68D
ADC_Keywords: Photometry, infrared ; QSOs ; BL Lac objects ; Gamma rays
Keywords: BL Lacertae objects: general - gamma rays: galaxies -
infrared: galaxies - radiation mechanisms: non-thermal
Abstract:
Blazars constitute the most enigmatic class of extragalactic
γ-ray sources, and their observational features have been
ascribed to a relativistic jet closely aligned to the line of sight.
They are generally divided in two main classes: the BL Lac objects (BL
Lacs) and the flat-spectrum radio quasars (FSRQs). In the case of BL
Lacs the double-bumped spectral energy distribution (SED) is generally
described by the synchrotron self-Compton (SSC) emission, while for
the FSRQs it is interpreted as due to external Compton (EC) emission.
Recently, we showed that in the [3.4]-[4.6]-[12]µm color-color
diagram the blazar population covers a distinct region (i.e., the WISE
blazar Strip (WBS)) clearly separated from the other extragalactic
sources that are dominated by thermal emission. In this paper, we
investigate the relation between the infrared and γ-ray emission
for a subset of confirmed blazars from the literature, associated with
Fermi sources, for which WISE archival observations are available.
This sample is a proper subset of the sample of sources used
previously, and the availability of Fermi data is critical to
constrain the models on the emission mechanisms for the blazars.
Description:
The number of Fermi-BZCAT blazars (blazars from ROMA-BZCAT catalog
(Massaro et al. 2010, Cat. J/A+A/495/691) with an associated Fermi
source in the 2FGL, Cat. J/ApJS/199/31) with a WISE counterpart within
the first region of 2.4" is 296, corresponding to ∼45% of the
Fermi-WISE blazar sample in the WISE Preliminary Source Catalog (WPSC,
see Cat. II/311), detected with a chance probability of ∼3%. We did
not find any multiple matches using 2.4" as search radius.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 100 296 Parameters of the Fermi-WISE blazars sample
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/ApJS/206/17 : New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)
J/ApJS/206/13 : Blazars with γ-ray counterparts. II. (Massaro+, 2013)
J/ApJ/732/116 : IR spectra of γ-ray bright blazars (Malmrose+, 2011)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- [MGL2009] ROMA-BZCat name (BZ[QBU]JHHMM+DDMM) (1)
15- 36 A22 --- OName Name of the associated source from the 2FGL
38- 42 F5.2 mag W1mag [9.09/16.17] WISE W1 magnitude (3.4um)
44- 47 F4.2 mag e_W1mag [0.02/0.12] W1mag uncertainty
49- 53 F5.2 mag W2mag [8/15] WISE W2 magnitude (4.6um)
55- 58 F4.2 mag e_W2mag [0.02/0.11] W2mag uncertainty
60- 64 F5.2 mag W3mag [5.21/12.5] WISE W3 magnitude (12um)
66- 69 F4.2 mag e_W3mag [0.02/0.22]? W3mag uncertainty
71- 74 F4.2 mag W4mag [3.04/9.4]? WISE W4 magnitude (22um)
76- 79 F4.2 mag e_W4mag [0.02/0.54]? W4mag uncertainty
81- 84 F4.2 --- Gamma [1.41/2.99] The Γγ photon index
of the source from the 2FGL catalog
86- 89 F4.2 --- e_Gamma [0.01/0.39] Gamma uncertainty
91- 95 F5.2 --- aIR [-0.62/2.75] IR spectral index α12
evaluated from WISE magnitudes (m1 and m2)
97-100 F4.2 --- e_aIR [0.04/0.24] aIR uncertainty
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Note (1): BZQJ0250+1712 and BZQJ1954-1123 are very likely BZUJ0250+1712 and
BZUJ1954-1123; corrected at CDS.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 11-Oct-2013