E. Kasai (Avtor), Saptashwa Bhattacharyya (Avtor), B. Marčun (Avtor), Judit Pérez Romero (Avtor), Samo Stanič (Avtor), Veronika Vodeb (Avtor), Serguei Vorobiov (Avtor), Gabrijela Zaharijas (Avtor), Marko Zavrtanik (Avtor), Danilo Zavrtanik (Avtor), Miha Živec (Avtor)

Povzetek

n the last two decades, very-high-energy gamma-ray astronomy has reached maturity: over 200 sources have been detected, both Galactic and extragalactic, by ground-based experiments. At present, Active Galactic Nuclei (AGN) make up about 40% of the more than 200 sources detected at very high energies with ground-based telescopes, the majority of which are blazars, i.e. their jets are closely aligned with the line of sight to Earth and three quarters of which are classified as high-frequency peaked BL Lac objects. One challenge to studies of the cosmological evolution of BL Lacs is the difficulty of obtaining redshifts from their nearly featureless, continuum-dominated spectra. It is expected that a significant fraction of the AGN to be detected with the future Cherenkov Telescope Array (CTA) observatory will have no spectroscopic redshifts, compromising the reliability of BL Lac population studies, particularly of their cosmic evolution. We started an effort in 2019 to measure the redshifts of a large fraction of the AGN that are likely to be detected with CTA, using the Southern African Large Telescope (SALT). In this contribution, we present two results from an on-going SALT program focused on the determination of BL Lac object redshifts that will be relevant for the CTA observatory.

Ključne besede

very-high energy gamma-rays;active galactic nuclei;Cherenkov Telescope Array;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.06 - Objavljeni znanstveni prispevek na konferenci (vabljeno predavanje)
Organizacija: UNG - Univerza v Novi Gorici
UDK: 52
COBISS: 164869123 Povezava se bo odprla v novem oknu
ISSN: 1824-8039
Št. ogledov: 95
Št. prenosov: 2
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Vrsta dela (COBISS): Delo ni kategorizirano
Strani: str. 1-15
Čas izdaje: 2022
ID: 19945510
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