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Speaker |
Arsioli, Bruno |
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Coauthors |
Arsioli, Bruno; Giommi, Paolo; Chang, YuLing |
| Talk Title |
The 1/2WHSP catalog of TeV candidates: Advantages of a multi-frequency approach for unveiling γ-ray sources. |
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Abstract |
High Synchrotron Peak blazars (HSP) are rare and extreme objects, emitting synchrotron radiation up to frequencies larger than 10^15Hz. These sources are expected to be gamma-ray emitters in the 100MeV-1TeV energy band, and are of main interest for observations with Fermi-LAT and ground based Cherenkov Telescope Arrays. Motivated by the growing need of promising targets for observation in the VHE band, we assembled the 1/2WHSP catalogs, which are by far the largest lists of HSP blazars up to date. The selection is based on multi-frequency criteria from radio to X-rays, and will be described in the talk. Although many of the 1/2WHSPs have not yet been confirmed by Fermi-LAT as a gamma-ray source, they are probably close or just below its threshold for detectability, and are not easy to identify by the automatic search methods currently applied to the Fermi raw data. It will be shown that it is possible to discover new gamma-ray sources by using the positions from bright HSP blazars as tentative seeds. Such approach not only allows us to better resolve the gamma-ray sky, but it is a also a proof of the concept that it is possible to support observations in the VHE Energy domain based on radio to X-ray properties of blazars. |
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