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1.
Arrival directions of the highest-energy cosmic rays detected with the Pierre Auger Observatory
Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Darko Veberič, Marta Trini, Samo Stanič, Ahmed Saleh, Gašper Kukec Mezek, Andrej Filipčič, Julien Aublin, 2015, published scientific conference contribution

Abstract: We present the results of a search for small to intermediate scale anisotropies in the distribution of arrival directions of ultra-high energy cosmic rays recorded at the Pierre Auger Observatory. The data set, gathered in ten years of operation, includes arrival directions with zenith angles up to 80◦, and is about three times larger than that used in earlier studies. We update the test based on correlations with active galactic nuclei (AGNs) from the Véron-Cetty and Véron catalog, which does not yield a significant indication of anisotropy with the present data set. We perform a blind search for localized excess fluxes and for self-clustering of arrival directions at angular scales up to 30◦ and for different energy thresholds between 40 EeV and 80 EeV. We also examine the correlation of arrival directions with relatively nearby galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, and a sample of radio galaxies with jets and with the Centaurus A galaxy. None of the searches shows a statistically significant evidence of anisotropy. The two largest departures from isotropy that were found have a post-trial probability ≈ 1.4%. One is for cosmic rays with energy above 58 EeV that arrive within 15◦ of the direction toward Centaurus A. The other is for arrival directions within 18◦ of Swift-BAT AGNs closer than 130 Mpc and brighter than 10[sup]44 erg/s, with the same energy threshold.
Found in: ključnih besedah
Summary of found: ...update the test based on correlations with active galactic nuclei (AGNs) from the Véron-Cetty and...
Keywords: ultra-high energy cosmic rays anisotropy studies active galactic nuclei Pierre Auger Observatory
Published: 02.03.2016; Views: 2627; Downloads: 166
.pdf Fulltext (1,32 MB)

2.
Redshift measurement of Fermi Blazars for the Cherenkov Telescope Array
Marko Zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, P. Goldoni, 2015, published scientific conference contribution

Found in: ključnih besedah
Summary of found: ...Cherenkov Telescope Array, very-high energy gamma-ray emission, active galactic nuclei, blazars, blazar redshift measurements, observational strateg...
Keywords: Cherenkov Telescope Array, very-high energy gamma-ray emission, active galactic nuclei, blazars, blazar redshift measurements, observational strategy optimization
Published: 11.03.2016; Views: 2603; Downloads: 170
.pdf Fulltext (466,41 KB)

3.
Prospects On Testing Lorentz Invariance Violation With The Cherenkov Telescope Array
Marko Zavrtanik, Danilo Zavrtanik, Gabrijela Zaharijas, Lili Yang, Serguei Vorobiov, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, M. K. Daniel, 2015, published scientific conference contribution

Found in: ključnih besedah
Summary of found: ...lation (LIV), Very High Energy (VHE) gamma-rays, fundamental physics probes, Active Galactic Nuclei (AGN), Gamma Ray Bursts (GRBs),...
Keywords: Cherenkov Telescope Array (CTA), Lorentz Invariance Violation (LIV), Very High Energy (VHE) gamma-rays, fundamental physics probes, Active Galactic Nuclei (AGN), Gamma Ray Bursts (GRBs), pulsars
Published: 14.03.2016; Views: 2260; Downloads: 160
.pdf Fulltext (904,49 KB)

4.
New Frontiers in Black Hole Astrophysics
2017, proceedings of peer-reviewed scientific conference contributions (international and foreign conferences)

Found in: ključnih besedah
Summary of found: ...astronomy, black holes, active galactic nuclei, gamma ray bursts, tidal disruption...
Keywords: astronomy, black holes, active galactic nuclei, gamma ray bursts, tidal disruption events, gravitational waves
Published: 17.08.2017; Views: 1663; Downloads: 0
.pdf Fulltext (106,73 KB)

5.
Very high-energy gamma-ray signature of ultrahigh-energy cosmic-ray acceleration in Centaurus A
Lili Yang, Jagdish C. Joshi, Luis Salvador Miranda, Soebur Razzaque, 2018, original scientific article

Found in: ključnih besedah
Summary of found: ...Radio Galaxy : Active Galactic Nuclei, Cosmic Rays, Multi-Wavelength Emission...
Keywords: Radio Galaxy : Active Galactic Nuclei, Cosmic Rays, Multi-Wavelength Emission
Published: 20.04.2018; Views: 1624; Downloads: 0
.pdf Fulltext (325,57 KB)

6.
Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation
Serguei Vorobiov, Samo Stanič, Christopher Eckner, R. Adam, A. Acharyya, F. Acero, H. Abe, H. Abdalla, Gabrijela Zaharijas, Marko Zavrtanik, Danilo Zavrtanik, Miha Živec, 2021, original scientific article

Abstract: The Cherenkov Telescope Array (CTA), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. We study some of the salient areas of γ cosmology that can be explored as part of the Key Science Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic jets. Observations of AGN with CTA will enable a measurement of γ absorption on the extragalactic background light with a statistical uncertainty below 15% up to a redshift z=2 and to constrain or detect γ halos up to intergalactic-magnetic-field strengths of at least 0.3 pG . Extragalactic observations with CTA also show promising potential to probe physics beyond the Standard Model. The best limits on Lorentz invariance violation from γ astronomy will be improved by a factor of at least two to three. CTA will also probe the parameter space in which axion-like particles could constitute a significant fraction, if not all, of dark matter. We conclude on the synergies between CTA and other upcoming facilities that will foster the growth of γ cosmology.
Found in: ključnih besedah
Summary of found: ...Projects of CTA, through simulated observations of active galactic nuclei (AGN) and of their relativistic...
Keywords: Cherenkov Telescope Array, active galactic nuclei, gamma-ray experiments, axions, extragalactic magnetic fields
Published: 02.03.2021; Views: 155; Downloads: 5
URL Fulltext (0,00 KB)
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