Speaker
Description
The detection of Tera-electronvolt (TeV; 10$^{12}$ electronvolts) emission in extragalactic galaxies has sparked renewed interest in exploring the characteristics and underlying physics of the enigmatic emission component. To delve deeper into the nature of TeV-detected blazars and unravel the mechanisms driving their high-energy behavior, we compiled a comprehensive sample comprising 51 TeV sources equipped with the core-dominance parameters in the radio, X-ray, γ-ray and TeV emission, which are crucial indicators for the beaming effect, to embark on an analysis aimed at elucidating the underlying beamed component in TeV and other high-energy bands emanating from blazars. We investigate mutual correlations between core-dominance parameters and observed luminosities from radio to TeV emission, and successfully resolve the high-energy spectral index into beamed and unbeamed component, manifesting the beaming effect dominates the multiwavelength emissions in blazars. We also propose a new method to estimate the Doppler factors in the X-ray, γ-ray and TeV band, respectively, which are key parameters for beaming effect as well. Our salient conclusions are as follows:
-
Our analysis confirms that low-energy peaked TeV blazars exhibit heightened beaming across various frequencies, validating the use of high-energy core-dominance parameters as reliable indicators of beaming effect, as evidenced by the beamed multiwavelength emissions.
-
The predominance of the beamed or jet component in shaping the observed total spectral index in the high- energy band underscores the applicability of the two-component emission model to TeV blazars, which encapsulates both beamed and unbeamed contributions. Our finding points out the total observed emissions are mainly originated from the core or jet component.
-
We estimate the Doppler factors at high-energy bands for both scenarios of continues and spherical jet launching in TeV blazars. For the case of continues jet, we obtain the median values are δ$_{X}$ = 14.17, δγ = 26.79 and δ$_{\rm TeV}$ = 12.73. On the other hand, δ$_{X}$ = 9.06, δγ = 19.62 and δ$_{\rm TeV}$ = 9.89 are ascertained for spherical blob, respectively. Our results suggest that the universality of beaming effect across diverse wavelength bands.
