dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
MAGIC Collaboration |
dc.contributor.author |
Marcote Martin, Benito |
dc.contributor.author |
Munar i Adrover, Pere |
dc.contributor.author |
Paredes i Poy, Josep Maria |
dc.contributor.author |
Paredes Fortuny, Xavier |
dc.contributor.author |
Ribó Gomis, Marc |
dc.contributor.author |
Zanin, Roberta |
dc.date |
2014-10-14T08:46:00Z |
dc.date |
2014-10-14T08:46:00Z |
dc.date |
2014-08 |
dc.date |
2014-10-14T08:46:00Z |
dc.identifier.citation |
0004-6361 |
dc.identifier.citation |
644032 |
dc.identifier.uri |
http://hdl.handle.net/2445/58577 |
dc.format |
9 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
Springer Verlag |
dc.relation |
Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361/201424072 |
dc.relation |
Astronomy and Astrophysics, 2014, vol. 568, num. 109, p. 1-9 |
dc.relation |
http://dx.doi.org/10.1051/0004-6361/201424072 |
dc.rights |
(c) Springer Verlag, 2014 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Estels |
dc.subject |
Noves (Estels) |
dc.subject |
Raigs gamma |
dc.subject |
Astrofísica |
dc.subject |
Stars |
dc.subject |
New stars |
dc.subject |
Gamma rays |
dc.subject |
Astrophysics |
dc.title |
MAGIC search for VHE γ-ray emission from AE Aquarii in a multiwavelength context |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
It has been claimed that the nova-like cataclysmic variable AE Aquarii (AE Aqr) is a very-high-energy (VHE, E> 100 GeV) source both on observational and theoretical grounds. Aims: We search for VHE γ-ray emission from AE Aqr during different states of the source at several wavelengths to confirm or rule out previous claims of detection of γ-ray emission from this object. Methods: We report on observations of AE Aqr performed by MAGIC. The source was observed during 12 h as part of a multiwavelength campaign carried out between May and June 2012 covering the optical, X-ray, and γ-ray ranges. Besides MAGIC, the other facilities involved were the KVA, Skinakas, and Vidojevica telescopes in the optical and Swift in X-rays. We calculated integral upper limits coincident with different states of the source in the optical. We computed upper limits to the pulsed emission limiting the signal region to 30% of the phaseogram and we also searched for pulsed emission at different frequencies applying the Rayleigh test. Results: AE Aqr was not detected at VHEs during the multiwavelength campaign. We establish integral upper limits at the 95% confidence level for the steady emission assuming the differential flux proportional to a power-law function dφ/ dE ∝ E- Γ, with a Crab-like photon spectral index of Γ = 2.6. The upper limit above 200 GeV is 6.4 × 10-12 cm-2 s-1 and above 1 TeV is 7.4 × 10-13 cm-2 s-1. We obtained an upper limit for the pulsed emission of 2.6 × 10-12 cm-2 s-1 for energies above 200 GeV. Applying the Rayleigh test for pulsed emission at different frequencies we did not find any significant signal. Conclusions: Our results indicate that AE Aqr is not a VHE γ-ray emitter at the level of emission previously claimed. We have established the most constraining upper limits for the VHE γ-ray emission of AE Aqr. |