A5107977455- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Silicon Carbide Semiconductor Technologies
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Integrated Circuits and Semiconductor Failure Analysis
- Radiation Effects in Electronics
- Alcohol Consumption and Health Effects
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Thin-Film Transistor Technologies
- CCD and CMOS Imaging Sensors
- Nanowire Synthesis and Applications
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Analog and Mixed-Signal Circuit Design
- Geophysics and Gravity Measurements
- Advanced MEMS and NEMS Technologies
Deutsches Elektronen-Synchrotron DESY
2014-2024
Centro Universitário FEI
2009-2023
Instituto Mauá de Tecnologia
2023
CTA Observatory
2021
Universidade de São Paulo
2010-2020
IMEC
2014-2015
Kavli Institute for Particle Astrophysics and Cosmology
2009-2011
Stanford University
2009-2011
SLAC National Accelerator Laboratory
2011
KU Leuven
2011
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build next generation instrument, factor 5-10 improvement sensitivity 100 GeV 10 TeV range extension energies well below above TeV. will consist two arrays (one north, one south) for full sky coverage be operated as open observatory....
The Crab nebula was observed with the H.E.S.S. stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 hours (after data quality selection). Observations were made three operational telescopes in late complete 4 telescope - February 2004 2005. observations are discussed used as an example to detail flux spectral analysis procedures H.E.S.S., evaluate systematic uncertainties measurements. spectrum gamma-rays from source calculated on run-by-run...
The high-frequency peaked BL Lac PKS 2155-304 at redshift z = 0.116 is a well-known VHE (>100 GeV) γ-ray emitter. Since 2002 its flux has been monitored using the H.E.S.S. stereoscopic array of imaging atmospheric Cerenkov telescopes in Namibia. During 2006 July dark period, average was measured to be more than 10 times typical values observed from object. This article focuses solely on an extreme outburst detected early hours 28 (MJD 53,944). during this I(>200 (1.72 ± 0.05stat 0.34syst) ×...
The Cherenkov Telescope Array, CTA, will be the major global observatory for very high energy gamma-ray astronomy over next decade and beyond. scientific potential of CTA is extremely broad: from understanding role relativistic cosmic particles to search dark matter. an explorer extreme universe, probing environments immediate neighbourhood black holes voids on largest scales. Covering a huge range in photon 20 GeV 300 TeV, improve all aspects performance with respect current instruments....
The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection very-high-energy (>600 GeV) cosmic-ray electrons. Here we present electron spectrum derived from data taken with High Energy Stereoscopic System (H.E.S.S.) imaging atmospheric Cherenkov telescopes. In this measurement, first type, are able to extend measurement beyond range accessible direct measurements. We find evidence for...
The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by ATIC experiment has - together with PAMELA detection a rise positron fraction up to 100 motivated many interpretations terms dark matter scenarios; alternative explanations assume nearby source like pulsar or supernova remnant. Here we present H.E.S.S. starting at 340 GeV. While overall flux measured is consistent data within statistical systematic errors, exclude pronounced peak as suggested for...
Abstract The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched geostationary orbit in 2027. It will carry a telescope with an unprecedentedly large field of view (204 deg 2 ) and near-ultraviolet (NUV; 230–290 nm) sensitivity (22.5 mag, 5 σ , at 900 s). ULTRASAT conduct the first wide-field survey transient variable NUV sources revolutionize our ability study hot Universe. explore new parameter space energy timescale (months-long light curves minutes cadence),...
The detection of fast variations the tera-electron volt (TeV) (10(12) eV) gamma-ray flux, on time scales days, from nearby radio galaxy M87 is reported. These are about 10 times as those observed in any other wave band and imply a very compact emission region with dimension similar to Schwarzschild radius central black hole. We thus can exclude several sites processes production. observations confirm that TeV gamma rays emitted by extragalactic sources than blazars, where jets not...
We present deep H.E.S.S. observations of the supernova remnant (SNR) RX J1713.7-3946. Combining data three years - from 2003 to 2005 we obtain significantly increased statistics and energy coverage as compared earlier & 2004 results. The are analysed separately for different years. Very good agreement gamma-ray morphology differential spectra is found when comparing combined image reveals J1713.7-3946 with unprecedented precision. An angular resolution 0.06 deg achieved, revealing...
We observed the W28 field (for ~40 h) at Very High Energy (VHE) gamma-ray energies (E>0.1 TeV) with H.E.S.S. Cherenkov telescopes. A reanalysis of EGRET E>100 MeV data was also undertaken. Results from NANTEN 4m telescope Galactic plane survey and other CO observations have been used to study molecular clouds. discovered VHE emission (HESSJ1801-233) coincident northeastern boundary W28, a complex sources (HESSJ1800-240A, B C) ~0.5 deg south in disc. The differential photon spectra are well...
Aims. LS 5039 is a High Mass X-ray Binary (HMXRB) comprising compact object in an eccentric 3.9 day orbit around massive O6.5V star. Observations at energies above 0.1 TeV (1011 eV) by the Energy Stereoscopic System (HESS) 2004 revealed that source of Very (VHE) γ-rays and hence, able to accelerate particles multi-TeV energies. Deeper observations HESS were carried out 2005 effort probe further high energy astrophysics taking place. In particular, we have searched for orbital modulation VHE...
Aims.To investigate the very high energy (VHE: >100 GeV) γ-ray emission from high-frequency peaked BL Lac 1ES 0229+200.
The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles energies exceeding 10^12 electron Volts (eV) and are bright sources very-high-energy (VHE) gamma-ray emission, it not yet known where VHE emission originates. Here we report on radio observations galaxy M87, revealing period extremely strong flares accompanied by increase flux from its nucleus. These results...
We report the discovery of faint very high energy (VHE; E > 100 GeV) γ-ray emission from radio galaxy Centaurus A in observations performed with High Energy Stereoscopic System (H.E.S.S.) experiment, an imaging atmospheric Cherenkov telescope array consisting four telescopes located Namibia. has been observed for more than 120 hr. signal a statistical significance 5.0σ is detected region including core and inner kpc jets. The integral flux above threshold ∼250 GeV measured to be 0.8% Crab...
The detection of gamma-rays from the source HESS J1745-290 in Galactic Center (GC) region with H.E.S.S. array Cherenkov telescopes 2004 is presented. After subtraction diffuse gamma-ray emission GC ridge, compatible a point-source spatial extent less than 1.2'(stat.) (95% CL). measured energy spectrum above 160 GeV power-law photon index 2.25 +/- 0.04(stat.) 0.10 (syst.) and no significant flux variation detected. These measurements are discussed framework dark matter annihilation. It found...
Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants which are thought to accelerate energetic cosmic rays up energies ~ 10^15 eV. We report detection gamma -- tracers such from starburst galaxy NGC 253 using H.E.S.S. array imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 GeV is F = (5.5 +/- 1.0stat 2.8sys) x 10^-13 ph. s-1 cm-2, implying cosmic-ray density about three orders magnitude larger than that center Milky Way....
Context.The detection of gamma rays in the very-high-energy (VHE) energy range (100 GeV–100 TeV) provides a direct view parent population ultra-relativistic particles found astrophysical sources. For this reason, VHE are useful for understanding underlying processes non-thermal
The Vela supernova remnant (SNR) is a complex region containing number of sources non-thermal radiation. inner section this SNR, within 2 degrees the pulsar PSR B0833-45, has been observed by HESS γ-ray atmospheric Cherenkov detector in 2004 and 2005. A strong signal seen from an extended to south pulsar, integration radius around position (, J2000.0). excess coincides with hard X-ray emission ROSAT ASCA satellites. energy spectrum source between 550 GeV 65 TeV well fit power law function...
AIMS: The properties of the very high energy (VHE; E>100 GeV) gamma-ray emission from high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure currently unknown redshift this object. METHODS: VHE Observations were with High Energy Stereoscopic System (HESS) in 2005 and 2006. H+K (1.45-2.45 micron) spectroscopy was performed March 2006 SINFONI, an integral field spectrometer ESO Very Large Telescope (VLT) Chile. RESULTS: A signal, ~10 standard deviations,...
Aims.We present results from deep γ-ray observations of the Galactic pulsar wind nebula HESS J1825–137 performed with array.
We report on the first simultaneous observations that cover optical, X-ray, and high-energy gamma-ray bands of BL Lac object PKS 2155−304. The were observed for 11 days, between 2008 August 25 September 6 (MJD 54704−54715), jointly with Fermi Gamma-ray Space Telescope HESS atmospheric Cherenkov array, providing MeV–TeV spectral energy distribution (SED) new generation γ-ray telescopes. ATOM telescope RXTE Swift observatories provided optical X-ray coverage low-energy component over same time...
Context.The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (HESS) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time 43 h. VHE (E > 1011 eV) γ-rays were detected first from this object.