S. Mueller
A5033987182- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Nuclear physics research studies
- Neutrino Physics Research
- Mechanics and Biomechanics Studies
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Stellar, planetary, and galactic studies
- Photocathodes and Microchannel Plates
- Particle physics theoretical and experimental studies
- CCD and CMOS Imaging Sensors
- Astronomical and nuclear sciences
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- History and Developments in Astronomy
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
ETH Zurich
2015-2024
Max Planck Institute for Nuclear Physics
2024
TU Dortmund University
2014
Friedrich-Alexander-Universität Erlangen-Nürnberg
2013
European Space Astronomy Centre
2011
University of Bamberg
2011
Consejo Nacional de Investigaciones Científicas y Técnicas
2011
Comisión Nacional de Energía Atómica
2011
University of Buenos Aires
2011
Universidad Nacional de La Plata
2011
The evolution of the cluster mass function traces growth linear density perturbations, providing valuable insights into structures, nature dark matter, and cosmological parameters governing Universe. primary science goal eROSITA, on board Spectrum Roentgen Gamma (SRG) mission, is to constrain cosmology through function. In this paper, we present a set constraints obtained from 5259 clusters galaxies detected over an area 12791 deg 2 in western Galactic hemisphere eROSITA’s first All-Sky...
The First G-APD Cherenkov Telescope (FACT) is the first in-operation test of performance silicon photo detectors in Astronomy. For more than two years it operated on La Palma, Canary Islands (Spain), for purpose long-term monitoring astrophysical sources. this, crucial and therefore has been studied great detail. Special care taken their temperature voltage dependence implementing a correction method to keep properties stable. Several measurements have carried out monitor performance....
Active Galactic Nuclei emit radiation over the whole electromagnetic spectrum up to TeV energies. Blazars are one subtype with their jets pointing towards observer. One of typical features is extreme variability on timescales, from minutes years. The fractional an often used parameter for investigating degree a light curve. Different detection methods and sensitivities instruments result in differently binned data curves gaps. As they can influence physics interpretation broadband...
The origin of the gamma-ray emission blazar Mrk 421 is still a matter debate. We used 5.5 years unbiased observing campaign data, obtained using FACT telescope and Fermi LAT detector at TeV GeV energies, longest densest so far, together with contemporaneous multi-wavelength observations, to characterise variability constrain underlying physical mechanisms. studied correlated light curves by ten different instruments found two significant results. X-ray are very well lag <0.6 days. radio (15...
The First G-APD Cherenkov Telescope (FACT) was built on the Canary Island of La Palma in October 2011 as a proof principle for silicon based photosensors Astronomy. scientific goal project is to study variability active galatic nuclei (AGN) at TeV energies. Observing small sample blazars whenever possible, an unbiased data collected. This allows selected objects timescales from hours years. Results first three years monitoring will be presented. To provide quick flare alerts community and...
Imaging Air Cherenkov Telescopes (IACT) measure the faint flashes of light emitted by air-showers that are produced when charged particles or gamma rays hit atmosphere. Therefore, atmosphere above IACT is an integral part detector. Variations in performance itself, but also changes absorption and scattering due to clouds dust affect interpretation measured signals. information about status full system crucial combine measurements from different time periods. The First G-APD Telescope (FACT)...
Active galactic nuclei show variability on time scales ranging from minutes to decades.The radiation these extreme objects spans many orders of magnitude along the whole electromagnetic spectrum.The spectral energy distribution shows two peaks, where for subgroup blazars first peak is in radio X-ray regime, while second gamma-ray regime.Due and wide range, simultaneous multi-wavelength observations are vital understand underlying physics.Furthermore, long-term monitoring crucial obtain an...
Markarian 421 and 501 are Active Galactic Nuclei two of the most prominent sources very high energetic gamma rays. In contrast to predominantly stable Crab Nebula, blazars have extremely variable gamma-ray fluxes. Those could be caused by erratic accretion flow instabilities, but also processes leading quasi periodic oscillations (QPOs). Recently, hints such a QPO Mrk with period about 322 days been observed Large Area Telescope on-board Fermi satellite at GeV energies featuring global local...
The First G-APD Cherenkov Telescope (FACT) has been monitoring TeV-blazars since October 2011. Thanks to its unbiased observing strategy, the robotic operation and usage of solid state photosensors (SiPM, aka G-APDs), instrument's duty cycle maximized observational gaps minimized, providing an unprecedented data sample more than 13'800 hours physics data, which 2600 were taken in past 12 months. Results automatic quick-look analysis are published with low latency on open-access website....
M. Nothe∗, a L. Ahnen b, Balbo c, Bergmann d , C. Bockermann e, A. Biland T. Bretz K. Brugge a, J. Buss D. Dorner S. Einecke Freiwald Hempfling Hildebrand G. Hughes W. Lustermann Mannheim Meier Morik Muller Neise Neronov A.-K. Overkemping Paravac F. Pauss Rhode Temme Thaele Toscano P. Vogler R. Walter and Wilbert Email: maximilian.noethe@tu-dortmund.de
A wastewater-treatment facility at Ford (Dearborn, Michigan) was recently upgraded from chemical de-emulsification to ultrafiltration (UF) followed by a membrane-biological reactor (MBR). This paper describes the design, startup, and initial operational performance of facility. Primary findings are as follows: (1) MBR proved resilient; (2) removed approximately 90% chemical-oxygen demand (COD) after primary UF; (3) removal total Kjeldahl nitrogen appeared be more sensitive operating...
Since more than two years, the First G-APD Cherenkov Telescope (FACT) is operating successfully at Canary Island of La Palma. Apart from its purpose to serve as a monitoring facility for brightest TeV blazars, it was built major step establish solid state photon counters detectors in astronomy. The camera Telesope comprises 1440 Geiger-mode avalanche photo diodes (G-APD aka. MPPC or SiPM) detection. properties gain G-APDs depend on temperature and applied voltage, realtime feedback system...
The First G-APD Cherenkov Telescope (FACT) is the first operational telescope of its kind, employing a camera equipped with silicon photon detectors (G-APD aka.SiPM).SiPMs have high detection efficiency (PDE), while being more robust to bright light conditions than commonly used photo-multiplier tubes.This technology has allowed us increase duty cycle beyond that current generation imaging air telescopes.During last four years, operation FACT proven SiPMs are suitable for an application in...
Segmented imaging reflectors are a great choice for Imaging Atmospheric Cherenkov Telescopes (IACTs). However, the alignment of individual mirror facets is challenging. We align segmented reflector by observing and optimizing its Bokeh function. can already be done with very little resources preparation time. Further, anytime, even during day. present first usage on FACT, 4m IACT Canary Island La Palma, Spain further test CTA MST prototype in Brelin Adlershof.
The First G-APD Cherenkov Telescope (FACT) is pioneering the usage of silicon photo mul- tipliers (SiPMs also known as G-APDs) for imaging atmospheric technique. It located at Observatorio Roque de los Muchachos on Canary island La Palma. Since first light in October 2011, it monitoring bright TeV blazars northern sky. By now, FACT only telescope operating with S I PMs a nightly basis. Over course last five years, has been demonstrating their reliability and excel- lent performance....
Imaging Atmospheric Cherenkov Telescopes provide large gamma-ray collection areas > 10^4 m^2 and successfully probe the high energetic sky by observing extensive air showers during night. The First G-APD Telescope (FACT) explores silicon based photoelectric converters (called G-APDs or SiPMs) which more observation time with strong moonlight, a stable photon gain over years of observations, mechanically simpler imaging cameras. So far, signal extraction methods used for FACT originate from...
Imaging Air Cherenkov Telescopes, including the First G-APD Telescope (FACT), use segmented reflectors.These offer large and fast apertures for little resources.However, one challenge is alignment of mirrors to gain a sharp image.For telescopes, high spatial temporal resolution crucial reconstruct air shower events.Therefore has align individual mirror positions orientations precisely.Alignment difficult due number degrees freedom and, because most techniques involve star, be done during...