J/ApJS/206/17 New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)
Searching for new γ-ray blazar candidates in the third Palermo BAT hard
X-ray Catalog with WISE.
Maselli A., Massaro F., Cusumano G., D'Abrusco R., La Parola V., Paggi A.,
Segreto A., Smith H.A., Tosti G.
<Astrophys. J. Suppl. Ser., 206, 17 (2013)>
=2013ApJS..206...17M 2013ApJS..206...17M
ADC_Keywords: Photometry, SDSS ; Redshifts ; QSOs ; BL Lac objects ;
Radio sources ; Infrared sources ; Photometry, UBV ; Ultraviolet
Keywords: BL Lacertae objects: general - galaxies: active -
radiation mechanisms: non-thermal - X-rays: galaxies
Abstract:
We searched for γ-ray blazar candidates among the 382
unidentified hard X-ray sources of the third Palermo BAT Catalog
(3PBC) obtained from the analysis of 66 months of Swift Burst Alert
Telescope (BAT) survey data and listing 1586 sources. We adopted a
recently developed association method based on the peculiar infrared
colors that characterize the γ-ray blazars included in the
second catalog of active galactic nuclei detected by the Fermi Large
Area Telescope. We used this method exploiting the data of the all-sky
survey performed by the Wide-field Infrared Survey Explorer (WISE) to
establish correspondences between unidentified 3PBC sources and WISE
γ-ray blazar candidates located within the BAT positional
uncertainty region at a 99% confidence level. We obtained a
preliminary list of candidates for which we analyzed all the available
data in the Swift archive to complement the information in the
literature and in the radio, infrared, and optical catalogs with the
information on their optical-UV and soft X-ray emission. Requiring the
presence of radio and soft X-ray counterparts consistent with the
infrared positions of the selected WISE sources, as well as a
blazar-like radio morphology, we finally obtained a list of 24
γ-ray blazar candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 24 List of correspondences between unidentified 3PBC
hard X-ray sources and WISE γ-ray blazar
candidates
table3.dat 78 96 Optical-UV photometry of WISE γ-ray blazar
candidates observed by Swift-UVOT
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See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)
J/A+A/524/A64 : 2PBC 54-month Palermo BAT-survey catalogue (Cusumano+, 2010)
J/ApJS/206/13 : Unidentified gamma-ray sources. II. (Massaro+, 2013)
J/ApJS/206/12 : Unidentified gamma-ray sources. I. (D'Abrusco+, 2013)
J/A+A/545/A101 : Spectra of 29 Swift/BAT optical counterparts (Parisi+, 2012)
J/A+A/541/A160 : X & gamma-ray obs. of selected blazars (Giommi+, 2012)
J/ApJS/195/2 : The second Swift BAT GRB catalog (BAT2) (Sakamoto+, 2011)
J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)
J/A+A/510/A48 : Palermo Swift-BAT Hard X-ray Catalogue (Cusumano+, 2010)
J/ApJ/699/603 : Evolution of Swift/BAT blazars (Ajello+, 2009)
J/ApJS/175/179 : The BAT1 gamma-ray burst catalog (Sakamoto+, 2008)
http://www.ifc.inaf.it/cgi-bin/INAF/pub.cgi?href=activities/bat/index.html :
The Palermo BAT survey catalogue at IASFPa
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- 3PBC 3PBC name (JHHMM.m+DDMM)
14- 36 A23 --- OName 3PBC counterpart name
38- 56 A19 --- WISE WISE name (JHHMMSS.ss+DDMMSS.s)
58 A1 --- Cl Class of the candidate as designated by our
association procedure (A=best) (1)
60- 64 F5.1 arcsec Sep Distance d from the 3PBC counterpart
65 A1 --- f_Sep [s] s: This value represents the distance of
the WISE source from the 3PBC source
67- 71 F5.3 --- z ? Redshift
73 I1 --- r_z ? Reference for z (2)
75- 80 F6.1 mJy Fr Radio flux density Fr
82 A1 --- r_Fr [nspf] Reference for Fr (3)
84- 88 F5.2 mag u-r ? u-r color index as derived from SDSS-DR9
90- 93 A4 --- IR/X Comparison between IR/X positions (4)
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Note (1): Three classes (A, B, and C) have been opportunely defined on the
basis of the values of the s parameter: high values are typical of
class A, while low values correspond to class C. See section 2 and 4.2
for further explanations and appendix equation (A1) for the s
parameter.
Note (2): Redshift reference as follows:
1 = 6dF, Jones et al. 2009, Cat. VII/259;
2 = Agudo et al. 2007, Cat. J/A+A/476/L17;
3 = SDSS-DR9 quasar catalog, Paris et al. 2012, Cat. VII/269;
4 = Burgess & Hunstead 2006, Cat. J/AJ/131/114;
5 = Tueller et al. 2008, Cat. J/ApJ/681/113
Note (3): Radio flux density reference as follows:
f = FIRST, White et al. 1997, Cat. VIII/90 (1.4GHz);
n = NVSS, Condon et al. 1998, Cat. VIII/65 (1.4GHz);
p = PMN, Wright et al. 1994, Cat. VIII/38 (4.85GHz);
s = SUMMS, Mauch et al. 2003, Cat. VIII/81 (843MHz).
Note (4): Abbreviations as follows:
ocir = the position of the WISE source with its error is completely included
in the uncertainty region of the XRT source. This agreement occurs
for all the selected candidates, including the three sources with no
Swift observation.
osqu = The three sources with no Swift observation but included in the ROSAT
All-Sky Survey Bright Source Catalog (1RXS; Voges et al. 1999,
Cat. IX/10).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- WISE WISE name of the candidate
(JHHMMSS.ss+DDMMSS.s)
21- 26 F6.2 deg GLAT The Galactic latitude b
28- 31 F4.2 mag E(B-V) The E(B-V) value
33- 36 F4.2 mag e_E(B-V) E(B-V) uncertainty
38- 48 I11 --- ObsID Swift observation identification number
50- 60 A11 "YYYY/MMM/DD" Date Observation date
62- 63 A2 --- Filt UVOT filter (U, B, V, M2, W1 or W2)
65- 69 I5 s Exp Exposure time
71- 74 F4.1 mag mag Magnitude in filter, or upper limit (1)
76- 78 F3.1 mag e_mag ? mag uncertainty (1)
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Note (1): The values without errors have to be considered as upper limits.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 26-Jun-2013