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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.
Highlights
Clusters of galaxies have long been considered as possible candidates for the sources of TeV gamma rays emitted by protons and electrons accelerated at large-scale shocks or by a galactic wind or active galactic nuclei (AGNs) [1,2,3,4,5,6,7,8,9]
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 emission regions of very high energy gamma-rays observed by SHALON from NGC 1275 well correlates with the photon emission regions viewed in X-rays by Chandra
Summary
Clusters of galaxies have long been considered as possible candidates for the sources of TeV gamma rays emitted by protons and electrons accelerated at large-scale shocks or by a galactic wind or active galactic nuclei (AGNs) [1,2,3,4,5,6,7,8,9]. NGC 1275 is extremely bright in the radio band and was classified as an FR I radio galaxy; it has a prominent structure that consists of a compact central source and an extended jet [15, 18]. The radio emission extends to great distances and shows a clear interaction with the gas inside the Perseus cluster of galaxies. NGC 1275 surrounded by extended filamentary structures historically aroused great interest owing to both its position at the center of the Perseus cluster and its possible “feedback” role [21]. Evidence for the “feedback” role of NGC 1275 can be obtained from ROSAT and Chandra observations, which reveal shells of hot gas and cavities that spatially coincide with the radio structures (Fig. 3) extending from the central, active part of the AGN.
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