2017A&A...598A..17C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST23:00:57

2017A&A...598A..17C - Astronomy and Astrophysics, volume 598A, 17-17 (2017/2-1)

2WHSP: A multi-frequency selected catalogue of high energy and very high energy γ-ray blazars and blazar candidates.

CHANG Y.-L., ARSIOLI B., GIOMMI P. and PADOVANI P.

Abstract (from CDS):

Aims. High synchrotron peaked blazars (HSPs) dominate the γ-ray sky at energies higher than a few GeV; however, only a few hundred blazars of this type have been cataloged 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 catalogue of γ-ray source candidates off the Galactic plane.
Methods. 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).
Results. We have assembled the largest and most complete catalogue of HSP blazars to date, which includes 1691 sources. A number of population properties, such as infrared colours, synchrotron peak, redshift distributions, and γ-ray spectral properties have been used to characterise the sample and maximize completeness. We also derived the radio log N-log S distribution. This catalogue 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 γ-ray sources and multi-messenger targets.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - BL Lacertae objects: general - radiation mechanisms: non-thermal - gamma rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/598/A17): 2whsp.dat>

Nomenclature: Table 2: 2WHSP JHHMMSS.s+DDMMSS N=1691.

Status at CDS:   All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO B0229+200 BLL 02 32 48.6154943841 +20 17 17.493345304   18.0 18.00     ~ 258 3
2 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2381 1
3 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 852 0
4 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1912 2

    Equat.    Gal    SGal    Ecl

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2020.07.03-23:00:57

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