A5077538234- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Geophysics and Sensor Technology
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Seismic Waves and Analysis
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Superconducting Materials and Applications
- Statistical and numerical algorithms
University of Warsaw
2016-2025
Astronomical Observatory
2010-2025
Nicolaus Copernicus Astronomical Center
2006-2024
Polish Academy of Sciences
1999-2024
HUN-REN Wigner Research Centre for Physics
2024
HUN-REN Institute for Nuclear Research
2024
Czech Academy of Sciences, Institute of Physics
2017-2023
Czech Academy of Sciences
2017-2023
Institute of Nuclear Physics, Polish Academy of Sciences
2019-2023
University of Canterbury
2023
Advanced Virgo is the project to upgrade interferometric detector of gravitational waves, with aim increasing number observable galaxies (and thus detection rate) by three orders magnitude. The now in an advanced construction phase and assembly integration will be completed end 2015. part a network, alongside two LIGO detectors US GEO HF Germany, goal contributing early waves opening new window observation on universe. In this paper we describe main features outline status construction.
Advanced gravitational wave interferometers, currently under realization, will soon permit the detection of waves from astronomical sources. To open era precision astronomy, a further substantial improvement in sensitivity is required. The future space-based Laser Interferometer Space Antenna and third-generation ground-based observatory Einstein Telescope (ET) promise to achieve required improvements frequency ranges. vastly improved third generation observatories could detailed...
We present an up-to-date, comprehensive summary of the rates for all types compact binary coalescence sources detectable by Initial and Advanced versions ground-based gravitational-wave detectors LIGO Virgo. Astrophysical estimates compact-binary depend on a number assumptions unknown model parameters, are still uncertain. The most confident among these rate predictions coalescing neutron stars which based extrapolations from observed pulsars in our Galaxy. These yield likely 100 per Myr...
Advanced gravitational wave detectors, currently under construction, are expected to directly observe signals of astrophysical origin. The Einstein Telescope (ET), a third-generation detector, has been proposed in order fully open up the emerging field astronomy. In this paper we describe sensitivity models for ET and investigate potential limits imposed by fundamental noise sources. A special focus is set on evaluating frequency band below 10 Hz where complex mixture seismic, gravity...
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 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 last decade of observational and theoretical developments in stellar binary evolution provides an opportunity to incorporate major improvements the predictions from population synthesis models. We compute Galactic merger rates for NS–NS, BH–NS, BH–BH mergers with StarTrack code. most important revisions include updated wind mass-loss (allowing stellar-mass black holes up 80 M☉), a realistic treatment common envelope phase (a process that can affect by 2–3 orders magnitude), qualitatively...
We present a comprehensive description of the population synthesis code StarTrack. The original has been significantly modified and updated. Special emphasis is placed here on processes leading to formation further evolution compact objects (white dwarfs, neutron stars, black holes). Both single binary star populations are considered. now incorporates detailed calculations all mass-transfer phases, full implementation orbital due tides, as well most recent estimates magnetic braking. This...
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...
A new generation of ground-based interferometric detectors for gravitational waves is currently under construction or has entered the commissioning phase (LIGO, VIRGO, GEO600, TAMA). We study most promising candidate sources these detectors: inspiraling double compact objects. use population synthesis methods to calculate properties and coalescence rates of: neutron stars, black hole-neutron star systems holes. also examine their formation channels. explicitly account evolution low-mass...
We present the spectrum of compact object masses: neutron stars and black holes that originate from single in different environments. In particular, we calculate dependence maximum hole mass on metallicity some specific wind loss rates (e.g., Hurley et al. Vink al.). Our calculations show highest observed Galaxy M_bh = 15 Msun high environment (Z=Zsun=0.02) can be explained with stellar models adopted here. To reach this result had to set Luminous Blue Variable at level about 0.0001 Msun/yr...
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...
Large gravitational wave interferometric detectors, like Virgo and LIGO, demonstrated the capability to reach their design sensitivity, but transform these machines into an effective observational instrument for astronomy a large improvement in sensitivity is required. Advanced detectors near future third-generation observatories more than one decade will open possibility perform astronomical observations from Earth. An overview of possible science reaches technological progress needed...
The development of advanced gravitational wave (GW) observatories, such as Advanced LIGO and Virgo, provides impetus to refine theoretical predictions for what these instruments might detect. In particular, with the range increasing by an order magnitude, search GW sources is extending beyond "local" Universe out cosmological distances. Double compact objects (neutron star-neutron star (NS-NS), black hole-neutron (BH-NS) hole-black hole (BH-BH) systems) are considered be most promising...
We present the results of most comprehensive survey Galactic plane in very high-energy (VHE) gamma-rays, including a public release sky maps, catalog VHE sources, and discovery 16 new sources gamma-rays. The High Energy Spectroscopic System (H.E.S.S.) (HGPS) was decade-long observation program carried out by H.E.S.S. I array Cherenkov telescopes Namibia from 2004 to 2013. observations amount nearly 2700 h data, covering at longitudes l = 250 deg 65 latitudes |b| < 3 deg. In addition...
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the limit is injection squeezed vacuum states light into interferometer's dark port. Here, we report on successful application this technology improve shot sensitivity Advanced Virgo detector. A enhancement up 3.2±0.1 dB beyond achieved. This nonclassical improvement corresponds 5%–8% increase binary neutron star horizon. The squeezing was...
Mergers of two stellar origin black holes are a prime source gravitational waves and under intensive investigations. One crucial ingredient in their modeling has so far been neglected. Pair-instability pulsation supernovae with associated severe mass loss may suppress formation massive holes, decreasing hole merger rates for the highest masses. The pair-instability limits Population I/II stellar-origin to 50 Msun, tension earlier predictions that maximum could be as high 100 Msun....
This paper presents a complete description of Virgo, the French-Italian gravitational wave detector. The detector, built at Cascina, near Pisa (Italy), is very large Michelson interferometer, with 3 km-long arms. In this paper, following presentation physics requirements, leading to specifications for construction detailed all its different elements given. These include civil engineering infrastructures, huge ultra-high vacuum (UHV) chamber (about 6000 cubic metres), optical components,...
All ten LIGO/Virgo binary black hole (BH-BH) coalescences reported following the O1/O2 runs have near-zero effective spins. There are only three potential explanations for this. If BH spin magnitudes large, then: (i) either both vectors must be nearly in orbital plane or (ii) angular momenta of BHs oppositely directed and similar magnitude. Then there is also possibility that (iii) small. We consider third hypothesis within framework classical isolated evolution scenario BH-BH merger...
The advanced interferometer network will herald a new era in observational astronomy. There is very strong science case to go beyond the detector and build detectors that operate frequency range from 1 Hz-10 kHz, with sensitivity factor ten better amplitude. Such be able probe of topics nuclear physics, astronomy, cosmology fundamental providing insights into many unsolved problems these areas.
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
The inner region of the Milky Way halo harbors a large amount dark matter (DM). Given its proximity, it is one most promising targets to look for DM. We report on search annihilations DM particles using γ-ray observations towards 300 pc Way, with H.E.S.S. array ground-based Cherenkov telescopes. analysis based 2D maximum likelihood method Galactic Center (GC) data accumulated by over last 10 years (2004-2014), and does not show any significant signal above background. Assuming Einasto...