Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/150806
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DC Field | Value | Language |
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dc.contributor.author | MAGIC Collaboration | - |
dc.contributor.author | Paredes i Poy, Josep Maria | - |
dc.contributor.author | Ribó Gomis, Marc | - |
dc.contributor.author | Bosch i Ramon, Valentí | - |
dc.date.accessioned | 2020-02-20T14:00:37Z | - |
dc.date.available | 2020-02-20T14:00:37Z | - |
dc.date.issued | 2007 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/2445/150806 | - |
dc.description.abstract | We report on the results from the observations in the very high energy band (VHE; Eγ ≥ 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC telescope, for a total of 40 hr during 26 nights, spanning the period between 2006 June and November. Searches for steady γ-ray signals yielded no positive result, and upper limits to the integral flux ranging between 1% and 2% of the Crab Nebula flux, depending on the energy, have been established. We also analyzed each observation night independently, obtaining evidence of γ-ray signals at the 4.0 σ significance level (3.2 σ after trial correction) for 154 minutes of effective on-time (EOT) on September 24 between 20:58 and 23:41 UTC, coinciding with an X-ray flare seen by RXTE, Swift, and INTEGRAL. A search for faster-varying signals within a night resulted in an excess with a significance of 4.9 σ (4.1 σ after trial correction) for 79 minutes EOT between 22:17 and 23:41 UTC. The measured excess is compatible with a pointlike source at the position of Cygnus X-1 and excludes the nearby radio nebula powered by its relativistic jet. The differential energy spectrum is well fitted by an unbroken power law described as dN/(dA dt dE) = (2.3 ± 0.6) × 10-12(E/1 TeV)-3.2±0.6. This is the first experimental evidence of VHE emission from a stellar mass black hole and therefore from a confirmed accreting X-ray binary. | - |
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/10.1086/521145 | - |
dc.relation.ispartof | Astrophysical Journal, 2007, vol. 665, p. 51-54 | - |
dc.relation.uri | https://doi.org/10.1086/521145 | - |
dc.rights | (c) American Astronomical Society, 2007 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Acceleradors de partícules | - |
dc.subject.classification | Astronomia de raigs gamma | - |
dc.subject.classification | Astronomia de raigs X | - |
dc.subject.other | Particle accelerators | - |
dc.subject.other | Gamma ray astronomy | - |
dc.subject.other | X-ray astronomy | - |
dc.title | Very High Energy Gamma-Ray Radiation from the Stellar Mass Black Hole Binary Cygnus X-1 | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 555276 | - |
dc.date.updated | 2020-02-20T14:00:37Z | - |
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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555276.pdf | 378.9 kB | Adobe PDF | View/Open |
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