Searches for gamma-quanta from local sources by a wide-angle imaging telescope

Sinitsyna, V. G.

doi:10.1007/bf02508138

Cited by 43 publications

(33 citation statements)

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“…This allows one to monitor the background from charged cosmic-ray particles and the atmospheric transparency continuously during observations and expands the area of observation and, hence, the efficiency of observations [2]. The technique for a e-mail: sinits@sci.lebedev.ru simultaneously obtaining information about the cosmicray background and the showers initiated by γ -rays is unique and has been applied in the SHALON experiment from the very beginning of its operation [2]. This technique serves to increase the useful source tracking time and, what is particularly important, such source and background observation conditions as the thickness and state of the atmosphere remain the same.…”

Section: Shalon Mirror Cherenkov Telescopesmentioning

confidence: 99%

“…Cyg X-3 has been regularly observed since 1995 with the SHALON telescope [2] during a total of 303.2 hours. The observations were performed using the standard (for SHALON) technique of obtaining information about the cosmic-ray background and γ -ray-initiated showers in the same observing session.…”

Section: Cyg X-3 Viewed In Tev Gamma-raysmentioning

confidence: 99%

“…To reveal possible correlation of periods of activity in the TeV energy range with the flares at the low energies the light curves of Swift/BAT (15-50 keV) 1 , MAXI (2-4 keV) [20], RXTE/ASM (3-5 keV) 2 , the fluxes at radioranges from RATAN (11.2 GHz) (see [21]), AMI-LA (15 GHz) 3 and TeV fluxes from SHALON observations were analyzed (Fig. 5).…”

Section: Flaring Activity Of Cyg X-3mentioning

confidence: 99%

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Particle acceleration in binaries

Sinitsyna

2017

EPJ Web Conf.

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Abstract. Cygnus X-3 massive binary system is one of the powerful sources of radio and X-ray emission consisting of an accreting compact object, probably a black hole, with a Wolf-Rayet star companion. Based on the detections of ultra high energy gamma-rays by Kiel and Havera Park, Cygnus X-3 has been proposed to be one of the most powerful sources of charged cosmic ray particles in the Galaxy. The results of long-term observations of the Cyg X-3 binary at energies 800 GeV-85 TeV detected by SHALON in 1995 are presented with images, integral spectra and spectral energy distribution. The identification of source with Cygnus X-3 detected by SHALON was secured by the detection of its 4.8 hour orbital period in TeV gamma-rays. During the whole observation period of Cyg X-3 with SHALON significant flux increases were detected at energies above 0.8 TeV. These TeV flux increases are correlated with flaring activity at a lower energy range of X-ray and/or at observations of Fermi LAT as well as with radio emission from the relativistic jets of Cygnus X-3. The variability of very high-energy gamma-radiation and correlation of radiation activity in the wide energy range can provide essential information on particle mechanism production up to very high energies. Whereas, modulation of very high energy emission connected to the orbital motion of the binary system, provides an understanding of the emission processes, nature and location of particle acceleration.

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Section: Shalon Mirror Cherenkov Telescopesmentioning

confidence: 99%

Section: Cyg X-3 Viewed In Tev Gamma-raysmentioning

confidence: 99%

Section: Flaring Activity Of Cyg X-3mentioning

confidence: 99%

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Particle acceleration in binaries

Sinitsyna

2017

EPJ Web Conf.

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“…Extragalactic sources of very high energy γ -rays have been searched for in the SHALON experiment from the very beginning of its operation [23,24]. In 1996, observations with the SHALON mirror Cherenkov telescope revealed a new metagalactic source of γ -ray emission at very high energies E > 800 GeV [25,26] (Figs.…”

Section: Ngc 1275 Viewed In Tev Gamma-raysmentioning

confidence: 99%

Origin of very high energy emission in galaxy clusters

Sinitsyna

2017

EPJ Web Conf.

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Abstract. The Perseus cluster of galaxies with the central galaxy NGC 1275 is ideally suitable for studying both the physics of relativistic jets from Active Galactic Nuclei and for revealing the feedback role of the central galaxy. We present the results of fifteen-year-long observations of the AGN NGC 1275 at energies 800 GeV-40 TeV discovered by the SHALON telescope in 1996. The data obtained at very high energies by SHALON, namely the images of the galaxy and its surroundings, and the flux variability indicate that TeV γ -ray emission is produced by a number of processes: in particular, part of this emission is generated by relativistic jets in the nucleus of NGC 1275 itself. Unique data on GK Per(Nova 1901) and the IC 310 radio galaxy TeV γ -ray emission were obtained with the SHALON experiment for the first time.

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“…However, the field of view (FoV) of IACTs has not undergone a similar evolution. The largest FoV telescope had a field of about 7 • [2]. Contemporaneous IACTs typically cover a (2 − 4) • wide FoV.…”

Section: Introductionmentioning

confidence: 99%

A 15° wide field of view imaging air Cherenkov telescope

Mirzoyan

Andersen

2009

Astroparticle Physics

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Contemporary imaging air Cherenkov telescopes (IACT) for ground-based very high energy (VHE) gamma-ray astronomy have prime focus optical design. Typically these telescopes have a (2−4) • wide field of view (FoV). They use F/0.7-F/1.2 optics and provide (3−10)′ resolution in the FoV. Generally, a well designed telescope that includes more than one optical element will offer some advantages not available in prime focus designs, such as a wider FoV, a more compact size, a higher and more homogeneous resolution and a lower degree of isochronous distortion of light rays focused onto the focal plane. Also, they allow monitoring the gamma-ray activity in a sizeable portion of the sky in a single observation. This would allow one to perform a sensitive all-sky survey in a relative short time. We present an F/0.8 15 • wide FoV telescope design, which provides a high and near uniform resolution and low isochronous distortion across the entire FoV.

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Searches for gamma-quanta from local sources by a wide-angle imaging telescope

Cited by 43 publications

References 0 publications

Particle acceleration in binaries

Particle acceleration in binaries

Origin of very high energy emission in galaxy clusters

A 15° wide field of view imaging air Cherenkov telescope

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