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- W3098713777 abstract "During its first four years of scientific observations, the Fermi Large Area Telescope (Fermi-LAT) detected 3033 $gamma$-ray sources above a 4$sigma$ significance level. Although most of the extra-Galactic sources are active galactic nuclei (AGN) of the blazar class, other families of AGNs are observed too, while a still high fraction of detections ($sim 30%$) remains with uncertain association or classification. According to the currently accepted interpretation, the AGN $gamma$-ray emission arises from inverse Compton (IC) scattering of low energy photons by relativistic particles confined in a jet that, in the case of blazars, is oriented very close to our line of sight. Taking advantage of data from radio and X-ray wavelengths, which we expect to be produced together with $gamma$-rays, providing a much better source localization potential, we focused our attention on a sample of $gamma$-ray Blazar Candidates of Undetermined Type (BCUs), starting a campaign of optical spectroscopic observations. The main aims of our investigation include a census of the AGN families that contribute to $gamma$-ray emission and a study of their redshift distribution, with the subsequent implications on the intrinsic source power. We furthermore analyze which $gamma$-ray properties can better constrain the nature of the source, thus helping in the study of objects not yet associated with a reliable low frequency counterpart. In this communication we report on the instruments and techniques used to identify the optical counterparts of $gamma$-ray sources, we give an overview on the status of our work, and we discuss the implications of a large scale study of $gamma$-ray emitting AGNs." @default.
- W3098713777 created "2020-11-23" @default.
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- W3098713777 date "2015-12-01" @default.
- W3098713777 modified "2023-10-13" @default.
- W3098713777 title "Optical Counterparts of Undetermined Type γ-Ray Active Galactic Nuclei with Blazar-Like Spectral Energy Distributions" @default.
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- W3098713777 doi "https://doi.org/10.1007/s12036-015-9357-6" @default.
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