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http://hdl.handle.net/2445/150143
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DC Field | Value | Language |
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dc.contributor.author | MAGIC Collaboration | - |
dc.contributor.author | Bosch i Ramon, Valentí | - |
dc.contributor.author | Ribó Gomis, Marc | - |
dc.contributor.author | Paredes i Poy, Josep Maria | - |
dc.date.accessioned | 2020-02-13T11:14:16Z | - |
dc.date.available | 2020-02-13T11:14:16Z | - |
dc.date.issued | 2008-08-22 | - |
dc.identifier.issn | 2041-8205 | - |
dc.identifier.uri | http://hdl.handle.net/2445/150143 | - |
dc.description.abstract | 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. | - |
dc.format.extent | 4 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Institute of Physics (IOP) | - |
dc.relation.isformatof | Reproducció del document publicat a: https://doi.org/10.1086/592348 | - |
dc.relation.ispartof | Astrophysical Journal Letters, 2008, vol. 685, num. 1, p. 23-26 | - |
dc.relation.uri | https://doi.org/10.1086/592348 | - |
dc.rights | (c) American Astronomical Society, 2008 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Raigs gamma | - |
dc.subject.classification | Galàxies | - |
dc.subject.other | Gamma rays | - |
dc.subject.other | Galaxies | - |
dc.title | Very high energy gamma-ray observations of strong flaring activity in M87 in 2008 February | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 570853 | - |
dc.date.updated | 2020-02-13T11:14:16Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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570853.pdf | 153.71 kB | Adobe PDF | View/Open |
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