A5059957834- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Neutrino Physics Research
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Astronomical Observations and Instrumentation
- Particle physics theoretical and experimental studies
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Gyrotron and Vacuum Electronics Research
- Calibration and Measurement Techniques
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Precipitation Measurement and Analysis
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- Noncommutative and Quantum Gravity Theories
University of Würzburg
2015-2024
ETH Zurich
2009-2024
Universitat de Barcelona
2008-2024
Institut d'Estudis Espacials de Catalunya
2024
Centro Brasileiro de Pesquisas Físicas
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2003-2023
École Polytechnique
2023
Centre National de la Recherche Scientifique
2023
Université de Montpellier
2023
Deutsches Elektronen-Synchrotron DESY
2021-2023
The blazar Mrk 501 was observed at energies above 0.10 TeV with the MAGIC Telescope from 2005 May through July. high sensitivity of instrument enabled determination flux and spectrum source on a night-by-night basis. Throughout our observational campaign, found to vary by an order magnitude. Intranight variability flux-doubling times down 2 minutes during two most active nights, namely, June 30 July 9. These are fastest variations ever in 501. ~20 minute long flare 9 showed indication 4 ± 1...
The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at distance more than 5 billion light-years (a redshift 0.536). No quasar been observed previously in radiation, and this is also most object emitting above 50 gigaelectron volts. Because high-energy may be stopped by interacting with diffuse background light universe,...
Microquasars are binary star systems with relativistic radio-emitting jets. They potential sources of cosmic rays and can be used to elucidate the physics We report detection variable gamma-ray emission above 100 gigaelectron volts from microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar phase, which suggests that is periodic. The strongest not observed when two stars closest one another, implying strong modulation or absorption processes.
Abstract A neutrino with energy ∼290 TeV, IceCube-170922A, was detected in coincidence the BL Lac object TXS 0506+056 during enhanced gamma-ray activity, chance being rejected at ∼3 σ level. We monitored very-high-energy (VHE) band Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes for ∼41 hr from 1.3 to 40.4 days after detection. Day-timescale variability is clearly resolved. interpret quasi-simultaneous and broadband electromagnetic observations a novel one-zone...
We report about very high energy (VHE) γ-ray observations of the Crab Nebula with MAGIC telescope. The flux from nebula was measured between 60 GeV and 9 TeV. spectrum can be described by a curved power law dF/dE = f0(E/300 GeV)[a+blog10(E/300 GeV)] normalization f0 (6.0 ± 0.2stat) × 10−10 cm−2 s−1 TeV−1, − 2.31 0.06stat, b 0.26 0.07stat. peak in spectral distribution is estimated at 77 35 GeV. Within observation time experimental resolution telescope, emission steady pointlike. emission's...
We analyze the timing of photons observed by MAGIC telescope during a flare active galactic nucleus Mkn 501 for possible correlation with energy, as suggested some models quantum gravity (QG), which predict vacuum refractive index ≃1+(E/MQGn)n, n=1,2. Parametrizing delay between γ-rays different energies Δt=±τlE or Δt=±τqE2, we find τl=(0.030±0.012) s/GeV at 2.5-σ level, and τq=(3.71±2.57)×10−6 s/GeV2, respectively. use these results to establish lower limits MQG1>0.21×1018 GeV...
We report on the results from observations in very high energy band (VHE; Eγ ≥ 100 GeV) of black hole X-ray binary (BHXB) Cygnus X-1. The were performed with MAGIC telescope, for a total 40 hr during 26 nights, spanning period between 2006 June and November. Searches steady γ-ray signals yielded no positive result, upper limits to integral flux ranging 1% 2% Crab Nebula flux, depending energy, have been established. also analyzed each observation night independently, obtaining evidence at...
One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring high-end region a pulsar's spectrum would shed light on this question. By developing new electronic trigger, we lowered threshold Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 GeV. In configuration, detected gamma-rays from Crab pulsar that were greater than GeV, revealing relatively high cutoff energy in phase-averaged spectrum. This indicates emission...
We report the detection of a new source very high energy (VHE; Eγ ≥ 100 GeV) γ-ray emission located close to Galactic plane, MAGIC J0616+225, which is spatially coincident with supernova remnant IC 443. The observations were carried out telescope in periods 2005 December-2006 January and 2006 December-2007 January. Here we present results from this source, leading VHE signal statistical significance 5.7 σ 2006/2007 data measured differential flux consistent power law, described as dNγ/(dA dt...
Recently, the Galactic center has been reported to be a source of very high energy (VHE) γ-rays by CANGAROO, VERITAS, and HESS experiments. The spectra as measured these experiments show substantial differences. In this Letter we present MAGIC observations center, resulting in detection differential γ-ray flux consistent with steady, hard-slope power law, described dNγ/(dA dt dE) = (2.9 ± 0.6) × 10-12(E/TeV)-2.2±0.2 cm-2 s-1 TeV-1. is centered at (R.A., decl.) (17h45m20s, -29°2'). This...
The Perseus galaxy cluster was observed by the MAGIC Cherenkov telescope for a total effective time of 24.4 hr during 2008 November and December. resulting upper limits on gamma-ray emission above 100 GeV are in range 4.6 to 7.5 x 10^{-12} cm^{-2} s^{-1} spectral indices from -1.5 -2.5, thereby constraining produced cosmic rays, dark matter annihilations, central radio NGC1275. Results compatible with cosmological simulations cosmic-ray-induced emission, average ray-to-thermal pressure <4%...
We performed a 4.5-month multi-instrument campaign (from radio to VHE gamma rays) on Mrk421 between January 2009 and June 2009, which included VLBA, F-GAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, Whipple, among other instruments collaborations. was found in its typical (non-flaring) activity state, with flux of about half that the Crab Nebula, yet light curves show significant variability at all wavelengths, highest being X-rays. determined power spectral densities (PSD) most wavelengths...
It is widely believed that the bulk of Galactic cosmic rays are accelerated in supernova remnants (SNRs). However, no observational evidence presence particles PeV energies SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one best candidates to study acceleration processes. Between December 2014 and October 2016 we observed Cas with MAGIC telescopes, accumulating 158 hours good-quality data. We derived spectrum source from 100 GeV 10 TeV. also analysed...
We present a measurement of the extragalactic background light (EBL) based on joint likelihood analysis 32 gamma-ray spectra for 12 blazars in redshift range z = 0.03 to 0.944, obtained by MAGIC telescopes and Fermi-LAT. The EBL is part diffuse radiation spanning ultraviolet, visible infrared bands. Major contributors are emitted stars through history universe, fraction it which was absorbed dust galaxies re-emitted at longer wavelengths. can be studied indirectly its effect very-high energy...
On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of speed light in vacuo for as predicted by several quantum gravity models. Based on set assumptions possible intrinsic spectral and temporal evolution, we obtain competitive lower limits quadratic leading order modification.
Abstract The Cherenkov Telescope Array (CTA) is a next-generation ground-based observatory for gamma-ray astronomy at very high energies. Large-Sized prototype (LST-1) located the CTA-North site, on Canary Island of La Palma. LSTs are designed to provide optimal performance in lowest part energy range covered by CTA, down ≃20 GeV. LST-1 started performing astronomical observations 2019 November, during its commissioning phase, and it has been taking data ever since. We present first Crab...
ABSTRACT In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host MAGIC-SII system (Stellar Intensity Interferometer), implemented to investigate feasibility and potential this technique on IACTs. After first successful measurements in 2019, was upgraded now features real-time, dead-time-free, 4-channel, GPU-based correlator. These hardware...
The MAGIC telescope took data of very high energy gamma-ray emission from the blazar Markarian 421 (Mkn 421) between November 2004 and April 2005. We present a combined analysis samples recorded under different observational conditions, down to energies 100 GeV. flux was found vary 0.5 -- 2 Crab units (integrated above 200 GeV), considered low state when compared known data. Although varied on day-by-day basis, no short-term variability observed, although there is some indication that not...
The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and 26 2006 July September. source is the historical prototype eponym of a class low-frequency-peaked (LBL) objects. A very high energy (VHE) γ-ray signal was discovered with 5.1 σ excess in data. Above 200 GeV, an integral flux (0.6 ± 0.2) × 10-11 cm-2 s-1 measured, corresponding approximately 3% Crab flux. differential spectrum between 150 900 GeV rather steep photon index -3.6 0.5. light curve shows no...
We searched for very high energy (VHE) gamma-ray emission from the supernova remnant Cassiopeia A. The shell-type A was observed with 17 meter MAGIC telescope between July 2006 and January 2007 a total time of 47 hours. source detected above an 250 GeV significance 5.2sigma photon flux 1 TeV (7.3+-0.7_stat+-2.2_sys)10^-13 cm^-2s^-1. spectrum is compatible power law dN/dE = E^-Gamma index Gamma=2.3+-0.2_stat+-0.2_sys. point-like within angular resolution telescope.
The MAGIC collaboration has recently reported the discovery of γ-ray emission from binary system LS I +61°303 in TeV energy region. Here we present new observational results on this source range between 300 GeV and 3 TeV. In total, 112 hr data were taken 2006 September December covering four orbital cycles object. This large amount allowed us to produce an integral flux light curve for first time all phases +61°303. addition, also obtained a differential spectrum two phase bins 0.5 < ϕ 0.6...