Abstract BL Lacertae objects (BL Lacs) are the dominant population of TeV emitting blazars. In this work, we investigate whether there are any special observational properties associated with TeV sources. To do so, we will compare the observational properties of TeV detected BL Lacs (TeV BLs) with non-TeV detected BL Lac objects (non-TeV BLs). From the 3rd Fermi/LAT source catalog (3FGL), we can obtain 662 BL Lacs, out of which 47 are TeV BLs and 615 are non-TeV BLs. Their multi-wavelength flux densities (FR, FO, FX and Fγ), photon spectral indexes (αph X and αphγ), and effective spectral indexes (αRO and αOX) are compiled from the available literature. Then the luminosities (log νLR, log νLO, log νLX, log νLγ) are calculated. From comparisons, we find that TeV BLs are different from low synchrotron peaked BLs and intermediate synchrotron peaked BLs, but TeV BLs show similar properties to high synchrotron peaked (HSP) BLs. Therefore, we concentrated on a comparison between TeV HSP BLs and non-TeV HSP Bls. Analysis results suggest that TeV HSP BLs and non-TeV HSP BLs exhibit some differences in their αRO and αphγ , but their other properties are quite similar.
Keywords galaxies: active — BL Lacertae objects: general — gamma rays: galaxies
It accepts original submissions from all over the world and is internationally published and distributed by IOP