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570853.pdf (153.71 KB)

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2008-08-22

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/150143

Very high energy gamma-ray observations of strong flaring activity in M87 in 2008 February

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https://doi.org/10.1086/592348

Resum

M87 is the only known nonblazar radio galaxy to emit very high energy (VHE) gamma rays. During a monitoring program of M87, a rapid flare in VHE gamma-rays was detected by the MAGIC telescope in early 2008. The flux was found to be variable above 350 GeV on a timescale as short as 1 day at a significance level of 5.6 σ. The highest measured flux reached 15% of the Crab Nebula flux. We observed several substantial changes of the flux level during the 13 day observing period. The flux at lower energies (150-350 GeV), instead, is compatible with being constant. The energy spectrum can be described by a power law with a photon index of 2.30 ± 0.11stat ± 0.20syst. The observed day-scale flux variability at VHE prefers the M87 core as source of the emission and implies that either the emission region is very compact (just a few Schwarzschild radii) or the Doppler factor of the emitting blob is rather large in the case of a nonexpanding emission region.

Matèries

Raigs gamma, Galàxies

Matèries (anglès)

Gamma rays, Galaxies

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

MAGIC Collaboration, et al. Very high energy gamma-ray observations of strong flaring activity in M87 in 2008 February. Astrophysical Journal Letters. 2008. Vol. 685, num. 1, pags. 23-26. ISSN 2041-8205. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/150143

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