M. Chernyakova
A5108167239- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Nuclear Physics and Applications
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Superconducting Materials and Applications
- Mechanics and Biomechanics Studies
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Ionosphere and magnetosphere dynamics
Dublin City University
2016-2025
Dublin Institute For Advanced Studies
2015-2024
EarthTech International (United States)
2014-2024
Centre National de la Recherche Scientifique
2022-2023
TU Dortmund University
2023
University of Łódź
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
University of Turku
2023
Niels Brock
2023
University of Copenhagen
2023
The exploration of the universe has recently entered a new era thanks to multi-messenger paradigm, characterized by continuous increase in quantity and quality experimental data that is obtained detection various cosmic messengers (photons, neutrinos, rays gravitational waves) from numerous origins. They give us information about their sources properties intergalactic medium. Moreover, astronomy opens up possibility search for phenomenological signatures quantum gravity. On one hand, most...
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...
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...
We report on the discovery of \geq 100 MeV {\gamma} rays from binary system PSR B1259-63/LS 2883 using Large Area Telescope (LAT) board Fermi. The comprises a radio pulsar in orbit around Be star. LAT observations near apastron to ~ 60 days after time periastron, tp, 2010 December 15. No {\gamma}-ray emission was detected this source when it far periastron. Faint appeared as approached At tp + 30d, flux increased over period few peak 20-30 times that seen during pre-periastron period, but...
Aims. We study the spectrum of cosmic X-ray background (CXB) in energy range ~5-100 keV.
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe performing high-resolution, high-throughput spectroscopy with moderate angular resolution. covers very wide energy range from 0.3 keV to 600 keV. allows combination band (5-80 keV) provided multilayer coating, focusing hard mirrors imaging detectors, high energy-resolution soft (0.3-12...
Abstract High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of faint unidentified emission line reported in several low-resolution studies various massive systems, such as galaxies and clusters, including Perseus cluster. We have analyzed first-light observation The for based on XMM-Newton signal from large cluster sample under dark matter decay scenario is too be detectable data. However, previously 3.5 keV flux anomalously high compared sample-based...
Extending the earlier measurements reported in Hitomi collaboration (2016, Nature, 535, 117), we examine atmospheric gas motions within central 100~kpc of Perseus cluster using observations obtained with satellite. After correcting for point spread function telescope and optically thin emission lines, find that line-of-sight velocity dispersion hot is remarkably low mostly uniform. The reaches maxima approximately 200~km~s$^{-1}$ toward active galactic nucleus (AGN) AGN inflated...
The Hitomi SXS spectrum of the Perseus cluster, with $\sim$5 eV resolution in 2-9 keV band, offers an unprecedented benchmark atomic modeling and database for hot collisional plasmas. It reveals both successes challenges current codes. latest versions AtomDB/APEC (3.0.8), SPEX (3.03.00), CHIANTI (8.0) all provide reasonable fits to broad-band spectrum, are close agreement on best-fit temperature, emission measure, abundances a few elements such as Ni. For Fe abundance, APEC measurements...
The Hitomi (ASTRO-H) mission is the sixth Japanese x-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. aimed to provide highest energy resolution ever achieved at E > 2 keV, using microcalorimeter instrument, cover wide range spanning four decades in from soft x-rays gamma rays. After successful launch on February 17, 2016, spacecraft lost its function March 26, but commissioning phase for about month provided valuable...
Employing data collected during the first 25 months' observations by Fermi-LAT, we describe and subsequently seek to model very high energy (>300 MeV) emission from central few parsecs of our Galaxy. We analyze morphological, spectral temporal characteristics source, 1FGL J1745.6-2900. Remarkably, show a clear, statistically significant signal at energies above 10 GeV, where Fermi-LAT has an excellent angular resolution comparable HESS TeV energies, which makes meaningful joint analysis...
Aims. We present an update of the 3C 273's database hosted by ISDC, completed with data from radio to gamma-ray observations over last 10 years. use this large set study multiwavelength properties quasar, especially focussing on its variability behaviour.
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by Institute Space and Astronautical Science (ISAS). will investigate physics high-energy universe via suite four instruments, covering very wide energy range, from 0.3 keV to 600 keV. These instruments include high-resolution, high-throughput spectrometer sensitive over 0.3-2 with high spectral resolution Delta E < 7 eV, enabled micro-calorimeter array located focal plane thin-foil...
We derive the spectra of cosmic X-ray background (CXB) and Galactic ridge emission (GRXE) in ~20-200 keV range from data IBIS instrument aboard INTEGRAL satellite obtained during four dedicated Earth-occultation observations early 2006. analyse modulation IBIS/ISGRI detector counts induced by passage Earth through field view instrument. Unlike previous studies, we do not fix spectral shape various contributions, but model instead their spatial distribution for each them expected counts. The...
The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions developed by Institute Space and Astronautical Science (ISAS), with planned launch 2015. equipped suite sensitive instruments highest energy resolution ever achieved at E > 3 keV wide range spanning four decades from soft X-rays to gamma-rays. simultaneous broad band pass, coupled high spectral Delta < 7 eV micro-calorimeter, will enable variety important science themes be pursued. expected...
The Hitomi (ASTRO-H) mission is the sixth Japanese X-ray astronomy satellite developed by a large international collaboration, including Japan, USA, Canada, and Europe. aimed to provide highest energy resolution ever achieved at E > 2 keV, using microcalorimeter instrument, cover wide range spanning four decades in from soft X-rays gamma-rays. After successful launch on 2016 February 17, spacecraft lost its function March 26, but commissioning phase for about month provided valuable...
High mass X-ray binaries are among the brightest sources in Milky Way, as well nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology, they have attracted interest of high energy astrophysical community since dawn Astronomy. In more recent years, challenged our comprehension physical processes many bands, ranging from infrared very energies. this review, we provide a broad but concise summary dominating emission across virtually whole electromagnetic spectrum....
We have obtained measurements and upper limits on the emission of Cyg X-1 in photon energy range 0.03--300 GeV based observations by Fermi. present results separately for hard soft spectral states, as well all analysed data. In state, we detect a weak steady 0.1--10 with power-law index Gamma=2.6+-0.2 at 4 sigma statistical significance. This measurement, even if considered to be an limit, strongly constrains Compton radio jet, that state. The number relativistic electrons jet has low enough...
We report on broad multi-wavelength observations of the 2010-2011 periastron passage gamma-ray loud binary system PSR B1259-63. High resolution interferometric radio establish extended emission trailing position pulsar. Observations with Fermi Gamma-ray Space Telescope reveal GeV flaring activity system, reaching spin-down luminosity pulsar, around 30 days after periastron. There are no clear signatures variability at radio, X-ray and TeV energies time flare. Variability in H$\alpha$ line,...
We report on the results of extensive multi-wavelength campaign from optical to GeV gamma-rays 2014 periastron passage PSR B1259-63, which is a unique high-mass gamma-ray emitting binary system with young pulsar companion. Observations demonstrate stable nature post-periastron flare and prove coincidence start rapid decay H$\alpha$ equivalent width, usually interpreted as disruption Be stellar disk. Intensive X-ray observations reveal changes in spectral behaviour happening at moment flare....
Thanks to its high spectral resolution (~5 eV at 6 keV), the Soft X-ray Spectrometer (SXS) on board Hitomi enables us measure detailed structure of spatially resolved emission lines from highly ionized ions in galaxy clusters for first time. In this series papers, using SXS we have measured velocities gas motions, metallicities and multi-temperature core Perseus cluster. Here, show that when inferring physical properties line emissivities systems like Perseus, resonant scattering (RS) effect...