J/A+A/579/A34 1WHSP: VHE {gamma}-ray blazar candidates (Arsioli+, 2015) ================================================================================ 1WHSP: an IR-based sample of ~1,000 VHE gamma-ray blazar candidates. Arsioli B., Fraga B., Giommi P., Padovani P., Marrese P.M. =2015A&A...579A..34A ================================================================================ ADC_Keywords: Gamma rays - QSOs Keywords: galaxies: active - BL Lacertae objects: general - radiation mechanisms: non-thermal - gamma rays: galaxies - infrared: galaxies - virtual observatory tools Abstract: Blazars are the dominant type of extragalactic sources at microwave and at {gamma}-ray energies. In the most energetic part of the electromagnetic spectrum (E>~100GeV) a high fraction of high Galactic latitude sources are blazars of the high synchrotron peaked (HSP) type, that is BL Lac objects with synchrotron power peaking in the UV or in the X-ray band. Building new large samples of HSP blazars is key to understand the properties of jets under extreme conditions, and to study the demographics and the peculiar cosmological evolution of these sources. High synchrotron peaked blazars are remarkably rare, with only a few hundreds of them expected to be above the sensitivity limits of currently available surveys, some of which include hundreds of millions of sources. To find these very uncommon objects, we have devised a method that combines ALLWISE survey data with multi-frequency selection criteria. The sample was defined starting from a primary list of infrared colour-colour selected sources from the ALLWISE all sky survey database, and applying further restrictions on IR-radio and IR-X-ray flux ratios. Using a polynomial fit to the multi-frequency data (radio to X-ray), we estimated synchrotron peak frequencies and fluxes of each object. Description: We assembled a sample including 992 sources, which is currently the largest existing list of confirmed and candidates HSP blazars. All objects are expected to radiate up to the highest {gamma}-ray photon energies. In fact, 299 of these are confirmed emitters of GeV {gamma}-ray photons (based on Fermi-LAT catalogues), and 36 have already been detected in the TeV band. The majority of sources in the sample are within reach of the upcoming Cherenkov Telescope Array (CTA), and many may be detectable even by the current generation of Cherenkov telescopes during flaring episodes. The sample includes 425 previously known blazars, 151 new identifications, and 416 HSP candidates (mostly faint sources) for which no optical spectra is available yet. The full 1WHSP catalogue is online at http://www.asdc.asi.it/1whsp/, providing a direct link to the SED building tool where multi-frequency data for each source can be easily visualised. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 90 992 *1WHSP sample of High Synchrotron Peaked blazars -------------------------------------------------------------------------------- Note on table2.dat: The full catalog is available at http://www.asdc.asi.it/1whsp containing complementary information and a direct link to the SED building tool where the multifrequency spectra for each source can be quickly visualised. -------------------------------------------------------------------------------- See also: 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/A+A/495/691 : Blazar multifrequency catalogue Roma-BZCAT (Massaro+, 2009) J/ApJ/764/135 : Spectroscopic redshifts of BL Lac objects (Shaw+, 2013) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 15 A15 --- 1WHSP 1WHSPJ designation (HHMMSS.s+DDMMSS) 17 A1 --- Bz [y-] in BZcat (J/A+A/495/691)? (1) 19 A1 --- l_log(nup) [>] Limit flag on log(nup) (2) 20- 24 F5.2 [Hz] log(nup) [15/18.4] Peak frequency, {nu}_peak_ 25 A1 --- u_log(nup) [*] Uncertainty flag on log(nup) 27 A1 --- l_log(fp) [>] Limit flag on log(fp) 28- 33 F6.2 [mW/m2] log(fp) [-13.1/-9.5] Peak flux in erg/cm^2^/s [{nu}*f_{nu}_({nu}_peak_)] 34 A1 --- u_log(fp) [*] Uncertainty flag on log(fp) 36 A1 --- l_z [>] Limit flag on z 37- 42 F6.4 --- z [0.01/1.1]?=0 Redshift (3) 44- 48 F5.2 --- rmag [14/20.3]? r magnitude used for redshift (3) 49 A1 --- r_z [bcdefg] References of z (3) 50 A1 --- u_z [*] Uncertainty flag on z 51- 67 A17 --- Fermi-LAT {gamma}-ray counterpart in the FERMI catalogs 69- 71 F3.1 --- Gamma [1.1/2.7]?=- Photon index {Gamma} measured for the energy band 0.1GeV