Naslov
Peculiar emission from the new VHE gamma-ray source H1722+119

Autori
Terzić, Tomislav ; Kolaboracija MAGIC ; ... ; Kurtanidze, Omar

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Skup
IAU Symposium 324: New Frontiers in Black Hole Astrophysics

Mjesto i datum
Ljubljana, Slovenija, 12.09.2016. - 16.09.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
BL Lacertae objects: individual (H1722+119); gamma-rays; multiwavelength

Sažetak
The BL Lac object H1722+119 was observed in the very-high energy band (VHE, E > 100 GeV) by the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes between 2013 May 17 and 22, following a state of high activity in the optical band measured by the KVA (Kungliga Vetenskapsakademien) telescope. Integrating 12.5 h of observation, the source was detected with a statistical significance of 5.9 sigma, with measured flux of f = (6.3 ± 1.6) × 10−12 ph cm-2 s−1 above 150 GeV, corresponding to (2.0 ± 0.5) per cent of the Crab Nebula flux in the same energy range. Contemporaneous observations were performed by the LAT (Large Area Telescope) on board the Fermi satellite in the high energy range (HE, 100 MeV < E < 100 GeV), by instruments on board the Swift satellite in the UV and X-ray region and by the OVRO (Owens Valley Radio Observatory) telescope in the radio band, allowing us to build a quasi simultaneous multi-wavelength SED (spectral energy distribution). An unexpected feature in the ∼ 3x1014 - 1018 Hz frequency range of the SED was identified. A possible explanation using an inhomogeneous helical jet synchrotron self-Compton model is suggested. The combination of HE and VHE gamma-ray observations, and the expected imprint of the extragalactic background absorption, allowed us to set a constraint on the redshift of this blazar to be z = 0.34 ± 0.15. No significant temporal variability of the flux in the HE and VHE bands was found. Contemporaneous data from the KVA and the OVRO telescopes show variable flux in optical and radio wavebands, respectively, although with different patterns.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA