1,721,804 research outputs found
Target of Opportunity Observations of Blasarswith the Magic Telescope.
No full texthe MAGIC collaboration has been performing Target of Opportunity observations of blazars, when
seen flaring in the optical by the Tuorla blazar monitoring program. In the past three years, there have
been 5 optical alerts during good weather conditions and reasonable declination of the source. Three alerts
have resulted in discoveries of VHE
-rays from previously undetected sources. In this paper we discuss
the discovered sources, MAGIC observations of BL Lac and 3C 279, and we give an outlook for ToO
observations of blazars with MAGIC in the MAXI era
Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303
No full textMicroquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I +61 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes
VHE gamma ray Astronomy with the MAGIC Telescope
No full textMAGIC is the largest of the new generation of Imaging Air Cherenkov Telescopes and has started regular
data-taking end of 2004. In this report I will give an overview about the status of the experiment and ongoing
upgrades, as well as the already rich harvest of galactic and extragalactic data taken so far
The MAGIC Experiment
No full textThe Magic Cherenkov Telescope is located at the Observatory of the Roque de los
Muchachos (ORM) and since 2004 is operative, in may 2005 was started the first yearly
campaign of data taking named Cycle I. During this period the telescope reported signals
from galactic and extragalactic AGN sources. In this report we will describe the
technique for the detection of Very High Energy (VHE) gammas by this class o
The MAGIC telescope
No full textMAGIC (Major Atmospheric Gamma Imaging Cherenkov telescope) is presently the largest
ground-based gamma ray telescope. MAGIC has been taking data regularly since October 2004
at the Roque de los Muchachos Observatory on the island of La Palma. In this paper the MAGIC
telescope status, its performances and some preliminary results on observed gamma ray sources
are presented
Very-High-Energy gamma rays from a Distant Quasar: How Transparent Is the Universe?
No full textThe 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 Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts
Gamma-Ray Astronomy with MAGIC above 25 GeV
No full textThe MAGIC telescopes are 17m diameter
Cherenkov telescopes, located on the Canarian island
La Palma (Spain), with an optimal view on the
Northern sky. It is nowadays the only ground-based
instrument able to measure high-energy °-rays below
100 GeV. A recent upgrade of the trigger system
allows to extend the sensitivity down to 25 GeV, which
resulted in the detection of pulsed emission from the
Crab pulsar. The construction of the second telescope
MAGIC-II has been completed and commissioning is
in its final phase phase. We review some recent experimental
results obtained with the single telescope
MAGIC-I
Highlights of MAGIC results
No full textMAGIC is the largest Cherenkov telescope currently operating and is in full operation since September 2004. Since then, it is providing a full wealth of exciting new physics results from its observations in the very high energy (VHE) region of galactic and extragalactic locations. Among the main results obtained, the discoveries of new sources and even of entire new classes of sources, as well as the observation of fast variability down to an unprecedented level of precision. Recent results for distant extragalactic sources are also shown: observations that are important for the development of new models of extragalactic background and to evaluate the systematic uncertainties of the imaging Cherenkov technique
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