Emission from the galaxy NGC 1275 at high and very high energies and its origin

Sinitsyna, V. G.

doi:10.1134/s1063773714030074

Cited by 28 publications

(39 citation statements)

References 47 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observations were performed using the standard (for SHALON) technique of obtaining information about the cosmic-ray background and gamma-ray-initiated showers in the same observing session. The SHALON method of selecting γ -ray showers from background cosmic-ray showers allows a 99.92% rejection of the background showers [6]. The gamma-ray source associated with GK Per was detected above 2 TeV by SHALON with a statistical significance 9.2σ determined by the Li&Ma method [4].…”

Section: Gk Per (Nova 1901)mentioning

confidence: 98%

“…The gamma-ray source associated with GK Per was detected above 2 TeV by SHALON with a statistical significance 9.2σ determined by the Li&Ma method [4]. The signal significance for this SNR is less then one for the source with a similar flux and spectrum index obtained in the same observation hours because of a smaller collection field of view relative to the standard procedure of the SHALON experiment [5,6].…”

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

“…We found that 1% of showers are common for both sources. After a detailed analysis of the arrival direction and angular distance of these showers [6], less than 0.5% of NGC 1275 showers were recognized to be GK Per showers. This didn't change the average flux of NGC 1275 form [6].…”

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

“…In accordance with a program on long-term studies of metagalactic γ -ray sources, fifteen-year-long observations of the central galaxy in the Perseus cluster, NGC 1275, are being carried out in the SHALON experiment [5,6]. During the observations of NGC 1275 the SHALON field of view contains the source of nonthermal radio and X-ray emission GK Per (Nova 1901) of classical nova type as it is located ∼ 3 • North from NGC 1275.…”

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

See 3 more Smart Citations

Shell-type SNRs as sources of cosmic rays

et al. 2017

View full text Add to dashboard Cite

Abstract. Investigations of VHE gamma-ray sources by any methods, including mirror Cherenkov telescopes, touch on the problem of the cosmic ray origin and, accordingly, the role of the Galaxy in their generation. SHALON observations have yielded results on Galactic supernova remnants (SNR) of different ages. Among them are: the shell-type SNRs Tycho's SNR (1572y), Cas A (1680y), IC 443 (age ∼ (3 ÷ 30) × 10 3 y), Cygni SNR (age ∼ (5 ÷ 7) × 10 3 y), G166.0 + 4.3 (age ∼ 24 × 10 3 y) and the classical nova GK Per (Nova 1901). Observation results are presented for each of the SNRs with spectral energy distributions by SHALON in comparison with other experiment data and images by SHALON together with data from X-rays by Chandra and radio-data by CGPS. The collected experimental data have confirmed the prediction of the theory about the hadronic generation mechanism of very high energy 800 GeV-100 TeV gamma-rays in Tycho's SNR, Cas A and IC443. For the first time, unique data on GK Per (Nova1901) TeV gamma-ray emission were obtained with the SHALON experiment. The X-ray data shows that the nova remnant of GK Per could be a younger remnant that will resemble older SNRs like IC 443 which interact with molecular clouds. GK Per is supposed to be a candidate for TeV gamma-ray emission due to accelerated particles in the reverse shock region.

show abstract

Section: Gk Per (Nova 1901)mentioning

confidence: 98%

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

Section: Gk Per (Nova 1901)mentioning

confidence: 99%

See 2 more Smart Citations

Shell-type SNRs as sources of cosmic rays

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Some of these AGNs were discovered at TeV energies by SHALON. The results on fluxes, spectral energy distributions and images are shown here and in [1][2][3][4][5][6][7]. All SHALON results are compared with data from experiments at high and very high energies (see Figs.…”

Section: Introductionmentioning

confidence: 99%

Very high energy emission sources beyond the Galaxy

et al. 2017

View full text Add to dashboard Cite

Abstract. Active Galactic Nuclei (AGN) are considered as potential extragalactic sources of very and ultra high energy cosmic rays. According to theoretical predictions cosmic ray acceleration can take place at the shock created by the expanding cocoons around active galactic nuclei as well as at AGN jets. The measurements of AGN TeV spectra, the variability time scale of TeV emission can provide essential information on the dynamics of AGN jets, the localization of acceleration region and an estimation of its size. SHALON observations yielded data on extragalactic sources of different AGN types in the energy range of 800 GeV-100 TeV. The data from SHALON observations are compared with those from other experiments at high and very high energies.

show abstract

The objects in observations of Perseus cluster region

Sinitsyna

2021

Astron Nachr

View full text Add to dashboard Cite

The results of 20-year observations of the Perseus cluster centering on the NGC 1275 including IC 310 radio galaxy and extragalactic supernova SN 2006gy at energies 800 GeV to 45 TeV by the SHALON telescope are presented. Also, the emission from the galactic source of non-thermal radio and X-ray emission GK Per (Nova 1901) of classical nova type was found as it accompanied to the observations. For NGC 1275, it was found that the TeV γ-ray emission at energies >800 GeV has an extended structure with a distinct core centered at the NGC 1275 nucleus and well correlates with the photon emission regions viewed in X-rays by Chandra and anti-correlates with radio-structures. Also, the variations of TeV γ-ray flux both at year-and day scales were found. The obtained data indicate that the part of TeV γ-ray emission is generated by relativistic jets in the nucleus of NGC 1275. Whereas the presence of an extended structure around NGC 1275 and the slow rise of the γ-ray flux is the evidence of the interaction of cosmic rays and magnetic fields generated in the jets at the galactic center with the gas of the Perseus cluster.

show abstract

Emission from the galaxy NGC 1275 at high and very high energies and its origin

Cited by 28 publications

References 47 publications

Shell-type SNRs as sources of cosmic rays

Shell-type SNRs as sources of cosmic rays

Very high energy emission sources beyond the Galaxy

The objects in observations of Perseus cluster region

Contact Info

Product

Resources

About