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Improving the performance of the single-dish Cherenkov telescope MAGIC through the use of signal timing
MAGIC Collaboration
The Cherenkov light flashes produced by Extensive Air Showers are very short in time. A high bandwidth and fast digitizing readout, therefore, can minimize the influence of the bac…
MAGIC upper limits to the VHE gamma-ray flux of 3C454.3 in high emission state
H. Anderhub, S. Vercellone, I. Donnarumma +2
We report upper limits to the very high energy flux (E>100 GeV) of the flat spectrum radio quasar 3C454.3 (z=0.859) derived by the Cherenkov telescope MAGIC during the high states…
Discovery of a very high energy gamma-ray signal from the 3C 66A/B region
MAGIC Collaboration, E. Aliu
The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 h in 2007 August-December. The observations resulted in the discovery of a gamma-ray source at ene…
Observation of Pulsed Gamma-rays Above 25 GeV from the Crab Pulsar with MAGIC
The MAGIC Collaboration, E. Aliu
One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on thi…
Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
MAGIC Collaboration, J. Albert
The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar R…
Photon propagation and the VHE gamma-ray spectra of blazars: how transparent is really the Universe?
A. De Angelis, O. Mansutti, M. Persic +1
Recent findings by gamma-ray Cherenkov telescopes suggest a higher transparency of the Universe to very-high-energy (VHE) photons than expected from current models of the Extragala…
Periodic very high energy gamma-ray emission from LS I +61 303 observed with the MAGIC telescope
MAGIC Collaboration, J. Albert
The MAGIC collaboration has recently reported the discovery of gamma-ray emission from the binary system LS I +61 303 in the TeV energy region. Here we present new observational re…
Very High Energy Gamma-Ray Observations of a Strong Flaring Activity in M87 in 2008 February
MAGIC Collaboration, J. Albert
M87 is the only known non blazar 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 MAG…
A novel background reduction strategy for high level triggers and processing in gamma-ray Cherenkov detectors
G. Cabras, A. De Angelis, B. De Lotto +17
Gamma ray astronomy is now at the leading edge for studies related both to fundamental physics and astrophysics. The sensitivity of gamma detectors is limited by the huge amount of…
MAGIC observations of the unidentified TeV gamma-ray source TeV J2032+4130
J. Albert
We observed the first known very high energy (VHE) gamma-ray emitting unidentified source, TeV J2032+4130, for 94 hours with the MAGIC telescope. The source was detected with a sig…
Simultaneous multiwavelength observations of the blazar 1ES1959+650 at a low TeV flux
G. Tagliaferri, L. Foschini, G. Ghisellini +7
We present the results from a multiwavelength campaign on the TeV blazar 1ES 1959+650, performed in May, 2006. Data from the optical, UV, soft- and hard-X-ray and very high energy…
Very-High Energy Gamma Astrophysics
Alessandro De Angelis, Oriana Mansutti, Massimo Persic
High-energy photons are a powerful probe for astrophysics and for fundamental physics under extreme conditions. During the recent years, our knowledge of the most violent phenomena…
Constraints on Large-Scale Magnetic Fields from the Auger Results
Alessandro De Angelis, Massimo Persic, Marco Roncadelli
A recent article from the Pierre Auger Collaboration links the direction of charged cosmic rays to possible extragalactic sites of emission. The correlation of the direction of suc…
Upper limit for gamma-ray emission above 140 GeV from the dwarf spheroidal galaxy Draco
MAGIC Collaboration, J. Albert
The nearby dwarf spheroidal galaxy Draco with its high mass to light ratio is one of the most auspicious targets for indirect dark matter searches. Annihilation of hypothetical DM…
Intergalactic absorption and blazar gamma-ray spectra
Massimo Persic, Alessandro De Angelis
The distribution of TeV spectral slopes versus redshift for currently known TeV blazars (16 sources with z<0.21, and one with z>0.25) is essentially a scatter plot with hardly any…
Gamma-ray blazars: the combined AGILE and MAGIC views
M. Persic, A. DeAngelis, F. Longo +1
We describe the emission properties of blazars, i.e. the AGNs that, due to their peculiar orientation w.r.t. the observer, allow the most penetrating and direct view of their centr…
The MAGIC Project: Contributions to ICRC 2007
J. Albert, E. Aliu, H. Anderhub +142
The MAGIC Project: Contributions to ICRC 2007, Merida, Mexico. Contents pages for the Contribution on behalf of the MAGIC Collaboration to the 30th ICRC that took place in July 200…
Very High Energy Gamma-ray Radiation from the Stellar-mass Black Hole Cygnus X-1
MAGIC Collaboration, J. Albert
We report on the results from the observations in very high energy band (VHE, E_gamma > 100 GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed w…
Discovery of VHE Gamma Radiation from IC443 with the MAGIC Telescope
MAGIC Collaboration
We report the detection of a new source of very high energy (VHE, E_gamma >= 100GeV) gamma-ray emission located close to the Galactic Plane, MAGIC J0616+225, which is spatially coi…
VHE astrophysics: recent developments
Massimo Persic, Alessandro De Angelis
We review the current status, and some open issues, of VHE astrophysics.
Systematic search for VHE gamma-ray emission from X-ray bright high-frequency BL Lac objects
M. Meyer
All but three (M87, BL Lac and 3C 279) extragalactic sources detected so far at very high energy (VHE) gamma-rays belong to the class of high-frequency peaked BL Lac (HBL) objects.…
Observation of VHE gamma-rays from Cassiopeia A with the MAGIC telescope
J. Albert
We searched for very high energy (VHE) gamma-ray emission from the supernova remnant Cassiopeia A. The shell-type supernova remnant Cassiopeia A was observed with the 17 meter MAGI…
VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC telescope
MAGIC Collaboration, J. Albert
We report about very high energy (VHE) gamma-ray observations of the Crab Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was measured between 60 GeV and 9 TeV.…
Discovery of very high energy gamma-ray emission from the low-frequency peaked BL Lacertae object BL Lacertae
MAGIC Collaboration, J. Albert
The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and for 26 hr during 2006 July to September. The source is the historical prototype and epon…