dc.creator | Arqueros, Fernando | es |
dc.creator | Ballestrín, Jesús | es |
dc.creator | Berenguel, Manuel | es |
dc.creator | Borque, D.M. | es |
dc.creator | Camacho, Eduardo F. | es |
dc.creator | Díaz, M. | es |
dc.creator | Gebauer, H.-J. | es |
dc.creator | Enríquez, R. | es |
dc.creator | Plaga, R. | es |
dc.date.accessioned | 2020-03-04T14:55:21Z | |
dc.date.available | 2020-03-04T14:55:21Z | |
dc.date.issued | 2002 | |
dc.identifier.citation | Arqueros, F., Ballestrín, J., Berenguel, M., Borque, D.M., Fernández Camacho, E., Díaz, M.,...,Plaga, R. (2002). Very high-energy γ-ray observations of the Crab nebula and other potential sources with the GRAAL experiment. Astroparticle Physics, 17 (.3), 293-318. | |
dc.identifier.issn | 0927-6505 | es |
dc.identifier.uri | https://hdl.handle.net/11441/93892 | |
dc.description.abstract | The “γ-ray astronomy at Almeria” (GRAAL) experiment uses 63 heliostat-mirrors with a total mirror area of ≈2500 m2 from the CESA-1 field at the “Plataforma Solar de Almeria” to collect Cherenkov light from air showers. The detector is located in a central solar tower and detects photon-induced showers with an energy threshold of 250±110 GeV and an asymptotic effective detection area of about 15 000 m2. A comparison between the results of detailed Monte-Carlo simulations and data is presented.
Data sets taken in the period September 1999–September 2000 in the direction of the Crab pulsar, the active galaxy 3C 454.3, the unidentified γ-ray source 3EG J1835+59 and a “pseudosource” were analyzed for high energy γ-ray emission. Evidence for a γ-ray flux from the Crab pulsar with an integral flux of 2.2±0.4 above threshold and a significance of 4.5σ in a total measuring time of 7 h and 10 min on source was found. No evidence for emission from the other sources was found.
Some difficulties with the use of heliostat fields for γ-ray astronomy are pointed out. In particular the effect of field-of-view restricted to the central part of a detected air shower on the lateral distribution and timing properties of Cherenkov light are discussed. Upon restriction the spread of the timing front of proton-induced showers sharply decreases and the reconstructed direction becomes biased towards the pointing direction. This is shown to make efficient γ-hadron separation difficult. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | Elsevier | es |
dc.relation.ispartof | Astroparticle Physics, 17 (.3), 293-318. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | γ-ray astronomy at Almeria | es |
dc.subject | Crab nebula | es |
dc.subject | GRAAL experiment | es |
dc.title | Very high-energy γ-ray observations of the Crab nebula and other potential sources with the GRAAL experiment | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/submittedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Ingeniería de Sistemas y Automática | es |
dc.relation.publisherversion | https://www.sciencedirect.com/science/article/pii/S0927650501001621#! | es |
dc.identifier.doi | 10.1016/S0927-6505(01)00162-1 | es |
idus.format.extent | 26 p. | es |
dc.journaltitle | Astroparticle Physics | es |
dc.publication.volumen | 17 | es |
dc.publication.issue | .3 | es |
dc.publication.initialPage | 293 | es |
dc.publication.endPage | 318 | es |
dc.identifier.sisius | 21002822 | es |