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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
2whsp.dat 93 1691 The 2WHSP catalog (table 4)
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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
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Bytes Format Units Label Explanations
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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 Synchrotron 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 Synchrotron 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
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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 2014A&A...565A..12P)
c = Furniss et al. (2013ApJ...768L..31F 2013ApJ...768L..31F)
d = Danforth et al. (2010ApJ...720..976D 2010ApJ...720..976D)
e = Shaw et al. (2013AJ....146..127S 2013AJ....146..127S)
f = Masetti et al. (2013A&A...559A..58M 2013A&A...559A..58M)
g = Sbarufatti et al. (2005AJ....129..559S 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 (http://dx.doi.org/10.1051/0004-6361/201628691).
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Acknowledgements:
Chang Yu Ling, stsun1223(at)hotmail.com
(End) Patricia Vannier [CDS] 29-Sep-2016