Name: Anilkumar Tolamatti
Affiliation: BARC, Mumbai
Conference ID : ASI2022_308
Title : Feasibility study of observing γ-ray emission from high redshift blazars using MACE telescope
Authors : A Tolamatti*, K K Singh* and K K Yadav* , *Astrophysical Sciences Division, Bhabha Atomic Research Centre, Mumbai-400 085, India , *Homi Bhabha National Institute, Anushaktinagar, Mumbai - 400 094, India
Abstract Type: Poster
Abstract Category : Extragalactic Astronomy
Abstract : The study of high redshift blazars is crucial to understand the cosmological evolution of blazars and formation of the supermassive black holes in the early phases of the Universe. The distant blazars are expected to be faint in the γ-ray energy band since the high energy γ-ray photons traveling over cosmological distances are absorbed by the low energy extra-galactic background light (EBL) photons via γ-γ pair production. Therefore, detection of blazars at high redshifts using ground-based telescopes is a very challenging task. In this contribution, we report the feasibility of observing high redshift blazars with the MACE gamma-ray telescope in the energy range of 30 GeV to 5 TeV. We have prepared a catalog of 94 high redshift blazars from the Fourth Fermi-LAT catalog of γ-ray sources for their plausible observation with the MACE telescope. We have calculated the integral flux for these sources by extrapolating their high energy Fermi spectral shapes in the MACE energy range and considering EBL absorption. Using the MACE sensitivity information, we have estimated the amount of time required for MACE telescope to detect these high redshift blazars at 5 σ statistical significance level. This study is very useful in identifying the potential high redshift blazars for MACE observations.