Detection of very high energy γ-ray emission from NGC 1275 by the MAGIC telescopes
dc.contributor.author
The MAGIC Collaboration
dc.contributor.author
Aleksić, Jelena
dc.contributor.author
Biland, Adrian
dc.contributor.author
Boller, Andrea
dc.contributor.author
Dorner, Daniela
dc.contributor.author
Hildebrand, Dorothée
dc.contributor.author
Huber, Benjamin
dc.contributor.author
Krähenbühl, Thomas
dc.contributor.author
Lorenz, Eckart
dc.contributor.author
Vogler, Patrick
dc.contributor.author
Weitzel, Quirin
dc.contributor.author
et al.
dc.date.accessioned
2024-07-25T08:14:16Z
dc.date.available
2024-07-25T08:08:51Z
dc.date.available
2024-07-25T08:14:16Z
dc.date.issued
2012-03
dc.identifier.issn
0004-6361
dc.identifier.issn
1432-0746
dc.identifier.other
10.1051/0004-6361/201118668
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/685171
dc.description.abstract
We report on the detection of very-high energy (VHE, E > 100 GeV) γ-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6σ above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Γ =-4.1 ± 0.7 stat ± 0.3syst, and the average flux above 100 GeV is Fγ = (1.3 ± 0.2stat ± 0.3 syst) × 10-11 cm-2 s-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Γ ≈-2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F U.L.γ (>300 GeV) = 1.2 × 10-12 cm-2 s-1 is a factor ∼ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE.
en_US
dc.language.iso
en
en_US
dc.publisher
EDP Sciences
en_US
dc.subject
Galaxies: active
en_US
dc.subject
Galaxies: jets
en_US
dc.subject
Galaxies: individual: NGC 1275
en_US
dc.subject
Gamma rays: galaxies
en_US
dc.subject
Galaxies: individual: IC310
en_US
dc.title
Detection of very high energy γ-ray emission from NGC 1275 by the MAGIC telescopes
en_US
dc.type
Journal Article
dc.date.published
2012-02-22
ethz.journal.title
Astronomy & Astrophysics
ethz.journal.volume
539
en_US
ethz.journal.abbreviated
Astron. Astrophys.
ethz.pages.start
L2
en_US
ethz.size
4 p.
en_US
ethz.publication.place
Les Ulis
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich, direkt::00012 - Lehre und Forschung, direkt::00007 - Departemente, direkt::02010 - Departement Physik / Department of Physics::02532 - Institut für Teilchenphysik (IPP) / Institute for Particle Physics (IPP)::03381 - Pauss, Felicitas (emeritus)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich, direkt::00012 - Lehre und Forschung, direkt::00007 - Departemente, direkt::02010 - Departement Physik / Department of Physics::02532 - Institut für Teilchenphysik (IPP) / Institute for Particle Physics (IPP)::03381 - Pauss, Felicitas (emeritus)
ethz.date.deposited
2017-06-10T00:46:35Z
ethz.source
ECIT
ethz.identifier.importid
imp59364f3504e2885151
ethz.identifier.importid
imp59365006d456151784
ethz.ecitpid
pub:80643
ethz.ecitpid
pub:94247
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2024-07-25T08:08:52Z
ethz.rosetta.lastUpdated
2024-07-25T08:08:52Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/49006
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/163321
ethz.COinS
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