Observations of active galactic nuclei with the GT-48 CrAO gamma-ray telescope in 2004

Neshpor, Yu. I.; Eliseev, V. S.; Jogolev, N. A.; Nehay, E. M.; Skiruta, Z. N.; Fidelis, V. V.; Fomin, V. P.

doi:10.3103/s0190271707010032

Cited by 4 publications

(2 citation statements)

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“…Takahashi et al 1996;Buckley et al 1996;Maraschi et al 1999b;Krawczynski et al 2001a;Neshpor et al 2007). Usually the reported correlation is linear, but in a few cases a quadratic relation between the fluxes in both bands was found (see e.g.…”

Section: Discussionmentioning

confidence: 99%

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Long-term lightcurves from combined unified very high energyγ-ray data

Tluczykont

Bernardini²,

Satalecka³

et al. 2010

A&A

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Context. Very high-energy (VHE, E > 100 GeV) γ-ray data are a valuable input for multi-wavelength and multi-messenger (e.g. combination with neutrino data) studies. Aims. We aim at the conservation and homogenization of historical, current, and future VHE γ-ray-data on active galactic nuclei (AGN). Methods. We have collected lightcurve data taken by major VHE experiments since 1991 and combined them into long-term lightcurves for several AGN, and now provide our collected datasets for further use. Due to the lack of common data formats in VHE γ-ray astronomy, we have defined relevant datafields to be stored in standard data formats. The time variability of the combined VHE lightcurve data was investigated, and correlation with archival X-ray data collected by RXTE/ASM tested.Results. The combination of data on the prominent blazar Mrk 421 from different experiments yields a lightcurve spanning more than a decade. From this combined dataset we derive an integral baseline flux from Mrk 421 that must be lower than 33% of the Crab Nebula flux above 1 TeV. The analysis of the time variability yields log-normal flux variations in the VHE-data on Mrk 421. Conclusions. Existing VHE data contain valuable information concerning the variability of AGN and can be an important ingredient for multi-wavelength or multi-messenger studies. In the future, upcoming and planned experiments will provide more data from many transient objects, and the interaction of VHE astronomy with classical astronomy will intensify. In this context a unified and exchangeable data format will become increasingly important.

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Section: Discussionmentioning

confidence: 99%

“…We are also working on collecting more data from these and other experiments such as the Crimean GT-48 Cherenkov telescope (e.g. Neshpor et al 2007), the Tibet air-shower array (e.g. Amenomori et al 2003), or the Patchmarhi Cherenkov Telescope Array (e.g.…”

Section: Lightcurve Datamentioning

confidence: 99%