Feasibility study of observing $$ \varvec {\gamma} $$ -ray emission from high redshift blazars using the MACE telescope
Tóm tắt
Blazars are the most powerful class of persistent
$$\gamma $$
-ray sources in the extragalactic Universe. Study of high redshift blazars is important to understand their cosmological evolution and formation of the supermassive black holes in the early phases of the Universe. The distant blazars are expected to be faint in the
$$\gamma $$
-ray energy band since the high-energy
$$\gamma $$
-ray photons traveling over cosmological distances are absorbed by the low-energy extragalactic background light photons via
$$\gamma $$
–
$$\gamma $$
pair production. Therefore, detection of high-energy
$$\gamma $$
-ray emission from the blazars at high redshifts using ground-based telescopes is a very challenging task. In this paper, we report the feasibility of observing high redshift blazars with the MACE gamma-ray telescope which has recently become operational at Hanle, Ladakh. We have prepared a catalog of 94 high redshift blazars from the Fourth Fermi-LAT catalog of
$$\gamma $$
-ray sources for their plausible observation with the MACE telescope. We have calculated the integral flux for these sources by extrapolating their Fermi-LAT spectra in the energy range from 30 GeV to 5 TeV. Using the MACE sensitivity information, we have estimated the total time required for the MACE telescope to detect the high-energy
$$\gamma $$
-ray emission from these high redshift blazars at 5
$$\sigma $$
statistical significance level.
Từ khóa
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