A5054552150- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Advanced X-ray and CT Imaging
- Noncommutative and Quantum Gravity Theories
- Gyrotron and Vacuum Electronics Research
- Stellar, planetary, and galactic studies
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Calibration and Measurement Techniques
- Soil Moisture and Remote Sensing
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
- Black Holes and Theoretical Physics
Max Planck Institute for Physics
2021-2025
Universitat de Barcelona
2024
Institut d'Estudis Espacials de Catalunya
2024
Institute for Cosmic Ray Research
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2019-2023
Institut de Recherche sur les Lois Fondamentales de l'Univers
2023
Université Paris-Saclay
2023
École Polytechnique
2023
Université de Montpellier
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2019-2023
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 provide an updated assessment of the power Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at TeV scale, via associated gamma-ray signal from pair-annihilating particles in region around Galactic centre. find that CTA will open a new window discovery potential, significantly extending range robustly testable models given standard cuspy profile density distribution. Importantly, even cored profile, projected sensitivity be sufficient probe various...
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...
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...
LHAASO J2108+5157 is one of the few known unidentified Ultra-High-Energy (UHE) gamma-ray sources with no Very-High-Energy (VHE) counterpart, recently discovered by collaboration. We observed in X-ray band XMM-Newton 2021 for a total 3.8 hours and at TeV energies Large-Sized Telescope prototype (LST-1), yielding 49 good quality data. In addition, we analyzed 12 years Fermi-LAT data, to better constrain emission its High-Energy (HE) counterpart 4FGL J2108.0+5155. found an excess (3.7 sigma)...
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...
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...
Fast radio bursts (FRBs) are bright flashes observed typically at GHz frequencies with millisecond duration, whose origin is likely extragalactic. Their nature remains mysterious, motivating searches for counterparts other wavelengths. FRB 121102 so far the only source known to repeatedly emit FRBs and associated a host galaxy redshift |$z$| ≃ 0.193. We conducted simultaneous observations of Arecibo MAGIC telescopes during several epochs in 2016–2017. This allowed time-scale burst emission...
Starburst galaxies and star-forming active galactic nuclei (AGN) are among the candidate sources thought to contribute appreciably extragalactic gamma-ray neutrino backgrounds. NGC 1068 is brightest of found emit gamma rays from 0.1 50 GeV. Precise measurements high-energy spectrum crucial study particle accelerators probe dominant emission mechanisms. We have carried out 125 hours observations with MAGIC telescopes in order search for very high energy band. did not detect significant...
Abstract Extreme high-frequency-peaked BL Lac objects (EHBLs) are blazars that exhibit extremely energetic synchrotron emission. They also feature nonthermal gamma-ray emission whose peak lies in the very high-energy (VHE, E > 100 GeV) range, and some sources exceeds 1 TeV: this is case for hard-TeV EHBLs such as 1ES 0229+200. With aim of increasing EHBL population, 10 targets were observed with MAGIC telescopes from 2010 to 2017, a total 265 hr good-quality data. The data complemented by...
We report the detection of pulsed gamma-ray emission from Geminga pulsar (PSR J0633+1746) between $15\,$GeV and $75\,$GeV. This is first time a middle-aged has been detected up to these energies. Observations were carried out with MAGIC telescopes 2017 2019 using low-energy threshold Sum-Trigger-II system. After quality selection cuts, $\sim 80\,$hours observational data used for this analysis. To compare at lower energies below sensitivity range MAGIC, $11$ years Fermi-LAT above $100\,$MeV...
Mrk501 is a very high-energy (VHE) gamma-ray blazar located at z=0.034. During period of two weeks in July 2014, the highest X-ray activity was observed ~14 years operation Neil Gehrels Swift Gamma-ray Burst Observatory. We characterize broadband variability from radio to VHE gamma rays, and evaluate whether it can be interpreted within theoretical scenarios widely used explain emission blazars. The temporal evolution most prominent variable segments SED described with one-zone synchrotron...