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J/A+A/598/A17       The 2WHSP catalog                          (Chang+, 2017)

2WHSP: A multi-frequency selected catalogue of high energy and very high energy gamma-ray blazars and blazar candidates. Chang Y.-L., Arsioli B., Giommi P., Padovani, P. <Astron. Astrophys. 598, A17 (2017)> =2017A&A...598A..17C (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Gamma rays Keywords: galaxies: active - BL Lacertae objects: general - radiation mechanisms: non-thermal - gamma rays: galaxies Abstract: High Synchrotron Peaked blazars (HSPs) dominate the gamma sky at energies larger than a few GeV; however, only a few hundred blazars of this type have been catalogued so far. In this paper we present the 2WHSP sample, the largest and most complete list of HSP blazars available to date, which is an expansion of the 1WHSP catalog of gamma-ray source candidates off the Galactic plane. We cross-matched a number of multi-wavelength surveys (in the radio, infrared and X-ray bands) and applied selection criteria based on the radio to IR and IR to X-ray spectral slopes. To ensure the selection of genuine HSPs we examined the SED of each candidate and estimated the peak frequency of its synchrotron emission (νpeak) using the ASDC SED tool, including only sources with νpeak>1015Hz (equivalent to νpeak>4eV). We have assembled the largest and most complete catalog of HSP blazars to date, which includes 1691 sources. A number of population properties, such as infrared colours, synchrotron peak, redshift distributions, and gamma-ray spectral properties, have been used to characterise the sample and maximize completeness. We also derived the radio logN-logS distribution. This catalog has already been used to provide seeds to discover new very high energy objects within Fermi-LAT data and to look for the counterparts of neutrino and ultra high energy cosmic ray sources, showing its potential for the identification of promising high-energy gamma, sources and multi-messenger targets. Description: The 2WHSP catalog is a multi-frequency catalog of HSP. It contains 1691 sources, 288 of which are newly identified HSPs, 540 are previously known HSPs, 814 are HSP candidates, 45 are HSP blazars taken from the 2FHL catalog, and 4 from TeVcat. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file 2whsp.dat 93 1691 The 2WHSP catalog (table 4)
See also: VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015) J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010) J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) Byte-by-byte Description of file: 2whsp.dat
Bytes Format Units Label Explanations
1- 15 A15 --- 2WHSPJ Name of the object (HHMMSS.s+DDMMSS) 16 A1 --- u_2WHSPJ [*] Uncertainty flag on 2WHSPJ 18- 21 A4 --- 5BZCat 5BZCat source 24 A1 --- l_lognupeak Limit flag on lognupeak (1) 25- 29 F5.1 [Hz] lognupeak Synchortron peak 30 A1 --- u_lognupeak [*] Uncertainty flag on lognupeak 32 A1 --- l_lognufnu Limit flag on lognufnu (1) 33- 37 F5.1 [mW/m2] lognufnu Synchortron peak flux (log(erg/s/cm2)) 38 A1 --- u_lognufnu [*] Uncertainty flag on lognufnu 40 A1 --- l_z Limit flag on z 41- 45 F5.3 --- z ?=- Redshift 46 A1 --- u_z [*] Uncertainty flag on z 47 A1 --- r_z [bcdefg] Reference on z (2) 49- 66 A18 --- Fermi-LAT Fermi gamma-ray detection (3) 68- 71 F4.2 --- GAMMA ?=- Fermi gamma-ray photon index 73- 76 F4.2 --- e_GAMMA ? Photon index error 78- 87 A10 --- 2FHL 2FHL source name (HHMM.m+DDd, J2000) 89- 93 F5.2 --- FOM Figure of Merit
Note (1): The lower limits and uncertain values on lognupeak and lognufnu are due to limited data, specially in the X-ray band. Note (2): References as follows: a = Shaw et al. (2013, Cat. J/ApJ/764/135) b = Pita et al. (2014A&A...565A..12P) c = Furniss et al. (2013ApJ...768L..31F) d = Danforth et al. (2010ApJ...720..976D) e = Shaw et al. (2013AJ....146..127S) f = Masetti et al. (2013A&A...559A..58M) g = Sbarufatti et al. (2005AJ....129..559S) or calculated by us (as described in Arsioli et al., 2015, Cat. J/A+A/579/A34). Note (3): FGL name or Arsioli2016 for sources in Arsioli & Chang, 2016, in press (
Acknowledgements: Chang Yu Ling, stsun1223(at)
(End) Patricia Vannier [CDS] 29-Sep-2016
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