A5054579127- 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
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Pancreatic and Hepatic Oncology Research
- Stellar, planetary, and galactic studies
- Nuclear Physics and Applications
- Noncommutative and Quantum Gravity Theories
- Gyrotron and Vacuum Electronics Research
- Cancer Genomics and Diagnostics
- Regulation of Appetite and Obesity
- Black Holes and Theoretical Physics
- Ovarian cancer diagnosis and treatment
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
University of Zagreb
2016-2024
ETH Zurich
2021-2023
University of Osijek
2006-2023
University of Rijeka
2014-2023
Turku Centre for Computer Science
2021-2023
University of Turku
2021-2023
University of Würzburg
2021-2023
Saha Institute of Nuclear Physics
2023
Istituto di Radioastronomia di Bologna
2021-2023
Max Planck Institute for Physics
2021-2023
We present the first joint analysis of gamma-ray data from MAGIC Cherenkov telescopes and Fermi Large Area Telescope (LAT) to search for signals dark matter annihilation in dwarf satellite galaxies. combine 158 hours Segue 1 observations with 6-year 15 galaxies by -LAT. obtain limits on cross-section particle masses between 10 GeV 100 TeV—the widest mass range ever explored a single analysis. These improve previously published -LAT results up factor two at certain masses. Our new inclusive...
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 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.
Extended and delayed emission around distant TeV sources induced by the effects of propagation gamma rays through intergalactic medium can be used for measurement magnetic field (IGMF). We search GeV from hard-spectrum blazar 1ES 0229+200 with goal to detect or constrain IGMF-dependent secondary flux generated during medium. analyze most recent MAGIC observations over a 5 year time span complement them historic data H.E.S.S. VERITAS telescopes along 12-year long exposure Fermi/LAT telescope....
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...
Among more than fifty blazars detected in very high energy (VHE, E>100GeV) gamma-rays, only three belong to the subclass of Flat Spectrum Radio Quasars (FSRQs). MAGIC observed FSRQ PKS 1510-089 February-April 2012 during a activity state (HE, E>100 MeV) gamma-ray band by AGILE and Fermi. observations result detection source with significance 6.0 sigma. In agreement previous VHE source, we find no statistically significant variability daily, weekly or monthly time scales. The other two...
Context. QSO B0218+357 is a gravitationally lensed blazar located at redshift of 0.944. The gravitational lensing splits the emitted radiation into two components that are spatially indistinguishable by gamma-ray instruments, but separated 10–12 day delay. In July 2014, experienced violent flare observed Fermi-LAT and followed MAGIC telescopes.
Aims. We aim to characterize the multiwavelength emission from Markarian 501 (Mrk 501), quantify energy-dependent variability, study potential multiband correlations, and describe temporal evolution of broadband within leptonic theoretical scenarios. Methods. organized a campaign take place between March July 2012. Excellent coverage was obtained with more than 25 instruments, including MAGIC, FACT VERITAS Cherenkov telescopes, instruments on board Swift Fermi spacecraft, telescopes operated...
The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided first direct evidence that short bursts (GRBs) can originate from binary neutron star (BNS) mergers. On other hand, properties GRBs high-energy gamma rays are still poorly constrained, with only $\sim$20 events detected GeV band, none TeV band. GRB~160821B is one nearest known at $z=0.162$. Recent analyses multiwavelength observational data its...
Abstract We study the broadband emission of Mrk 501 using multiwavelength observations from 2017 to 2020 performed with a multitude instruments, involving, among others, MAGIC, Fermi's Large Area Telescope (LAT), NuSTAR, Swift, GASP-WEBT, and Owens Valley Radio Observatory. showed an extremely low activity, which may help unravel its baseline emission. Nonetheless, significant flux variations are detected at all wave bands, highest occurring X-rays very-high-energy (VHE) γ -rays. A...
The renormalization-group equation for the zero-point energies associated with vacuum fluctuations of massive fields from standard model is examined. Our main observation that at any scale running necessarily dominated by heaviest degrees freedom, in clear contradistinction Appelquist-Carazzone decoupling theorem. Such an enhanced would represent a disaster cosmology, unless fine-tuned relation among masses heavy particles imposed. In this way, we obtain...
For cosmologies including scale dependence of both the cosmological and gravitational constant, an additional consistency condition dictated by Bianchi identities emerges, even if energy-momentum tensor ordinary matter stays individually conserved. renormalization-group (RG) approaches it is shown that such a relation ineluctably fixes RG (which may have explicit as well implicit time dependence), provided solutions equation for quantities are known. Hence, contrary to procedures employed in...
Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal to characterize detail source gamma-ray emission, together with radio-to-X-ray during non-flaring (low) activity, which less often than occasional flaring (high) activity. We organized a multiwavelength (MW) campaign on between March May 2008. This multi-instrument effort included most sensitive instruments northern hemisphere, namely imaging atmospheric...
We report on simultaneous broadband observations of the TeV-emitting blazar Markarian 501 between 1 April and 10 August 2013, including first detailed characterization synchrotron peak with Swift NuSTAR. During campaign, nearby BL Lac object was observed in both a quiescent an elevated state. The campaign includes NuSTAR, MAGIC, VERITAS, Fermi Large Area Telescope (LAT), X-ray UV Optical Telescope, various ground-based optical instruments, GASP-WEBT program, as well radio by OVRO,...
We report on observations of the pulsar / Be star binary system PSR J2032+4127 MT91 213 in energy range between 100 GeV and 20 TeV with VERITAS MAGIC imaging atmospheric Cherenkov telescope arrays. The orbit has a period approximately 50 years, most recent periastron occurring 2017 November 13. Our span from 18 months prior to one month after. A new, point-like, gamma-ray source is detected, coincident location 213. light curve spectrum are well-characterized over passage. flux variable at...