A5012943868- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
- Physics of Superconductivity and Magnetism
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Astrophysics and Star Formation Studies
- Superconducting Materials and Applications
- Thermal Radiation and Cooling Technologies
- Calibration and Measurement Techniques
- Superconductivity in MgB2 and Alloys
- Stellar, planetary, and galactic studies
- Microwave Engineering and Waveguides
- Astronomical Observations and Instrumentation
- Advanced Semiconductor Detectors and Materials
- Advanced Thermodynamic Systems and Engines
- Radio Frequency Integrated Circuit Design
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Photonic and Optical Devices
SRON Netherlands Institute for Space Research
2015-2024
High Energy Accelerator Research Organization
2024
International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles
2024
Delft University of Technology
2014-2021
VTT Technical Research Centre of Finland
2021
Tieto (Finland)
2021
Institute of Space and Astronautical Science
2009-2020
Tokyo Metropolitan University
2008-2020
National Institute of Advanced Industrial Science and Technology
2009-2020
Hokkaido University
2020
In a growing number of galaxy clusters diffuse extended radio sources have been found. These are not directly associated with individual cluster galaxies. The emission reveal the presence cosmic rays and magnetic fields in intracluster medium (ICM). We classify into halos, shocks (relics), revived AGN fossil plasma sources. Radio halo can be further divided giant mini-halos, possible `intermediate' Halos generally positioned at center their brightness approximately follows distribution...
We undertook a systematic X-ray analysis of six giant radio relics in four clusters galaxies using the Suzaku satellite. The sample included CIZA 2242.8$ +$ 5301, Zwcl 2341.1$-$ 0000, South-East part A 3667 and previously published results North-West 3376. Especially, we first observed narrow (50 kpc) relic 5301 by satellite, which enabled us to reduce projection effect. report on detections shocks at positions SE. At two ZWCL did not detect shocks. From spectroscopic temperature profiles...
The hot intra-cluster medium (ICM) permeating galaxy clusters and groups is not pristine, as it continuously enriched by metals synthesised in Type Ia (SNIa) core-collapse (SNcc) supernovae since the major epoch of star formation (z ~ 2-3). cluster/group enrichment history mechanisms responsible for releasing mixing can be probed via radial distribution SNIa SNcc products within ICM. In this paper, we use deep XMM-Newton/EPIC observations from a sample 44 nearby cool-core clusters, groups,...
Relativistic electrons and magnetic fields permeate the intra-cluster medium (ICM) manifest themselves as diffuse sources of synchrotron emission observable at radio wavelengths, namely halos relics. Although there is broad consensus that formation these connected to turbulence shocks in ICM, details required particle acceleration, strength morphology field cluster volume, influence other high-energy particles are poorly known. Sufficiently large samples relics, which would allow us examine...
During their lifetime, galaxy clusters grow through the accretion of matter from filaments large scale structure and mergers with other clusters. These release a amount energy into intracluster medium (ICM) merger shocks turbulence. phenomena are associated formation radio sources known as relics halos, respectively. Radio halos unique proxies to study complex properties these dynamically active regions in general micro physics ICM. Abell 3667 is spectacular examples merging system hosting...
The Line Emission Mapper (LEM) is an X-ray Probe for the 2030s that will answer outstanding questions of Universe's structure formation. It also provide transformative new observing capabilities every area astrophysics, and to heliophysics planetary physics as well. LEM's main goal a comprehensive look at galaxy formation, including stellar black-hole feedback flows baryonic matter into out galaxies. These processes are best studied in X-rays, emission-line mapping pressing need this area....
Diffuse cluster-scale synchrotron radio emission is discovered in an increasing number of galaxy clusters the form halos (RHs), probing presence relativistic electrons and magnetic fields intra-cluster medium. The favoured scenario to explain their origin that they trace turbulent regions generated during cluster mergers where particles are re-accelerated. In this framework, RHs expected probe dynamics predicted be more frequent massive systems. Statistical studies important study connection...
Previous studies have shown that CIZA J2242.8+5301 (the 'Sausage' cluster, $z=0.192$) is a massive merging galaxy cluster hosts radio halo and multiple relics. In this paper we present deep, high fidelity, low-frequency images made with the LOw-Frequency Array (LOFAR) between 115.5 179 MHz. These images, noise of 140 mJy/beam resolution $\theta_{\text{beam}}=7.3"\times5.3"$, are an order magnitude more sensitive five times higher than previous cluster. We combined LOFAR data existing GMRT...
The hot plasma within merging galaxy clusters is predicted to be filled with shocks and turbulence that may convert part of their kinetic energy into relativistic electrons magnetic fields generating synchrotron radiation. Analyzing Low Frequency Array (LOFAR) observations the cluster Abell 2255, we show evidence radio emission distributed over very large scales at least 5 megaparsec. pervasive witnesses efficiently transfer particles in a region extends up outskirts. strength requires field...
Context. It is well established that shock waves in the intracluster medium launched by galaxy cluster mergers can produce synchrotron emission, which visible to us at radio frequencies as relics. However, particle acceleration mechanism producing these relics still not fully understood. also unclear how relate halos, trace merger-induced turbulence medium. Aims. We aim perform first statistical analysis of a mass-selected sample clusters, using homogeneous observations. Methods. analysed...
Athena is designed to implement the Hot and Energetic Universe science theme selected by European Space Agency for second large mission of its Cosmic Vision program. The payload consists a aperture high angular resolution X-ray optics (2 m2 at 1 keV) twelve meters away, two interchangeable focal plane instruments: Integral Field Unit (X-IFU) Wide Imager. X-IFU cryogenic spectrometer, based on array Transition Edge Sensors (TES), offering 2:5 eV spectral resolution, with ~5" pixels, over...
The galaxy cluster Abell 2256 hosts one of the most intriguing examples in class radio relics. It has been found that this relic a rather flat integrated spectrum at low frequencies would imply an injection spectral index for electrons is inconsistent with flattest allowed by test particle diffusive shock acceleration (DSA). We performed new high-frequency observations 2273, 2640, and 4850 MHz. Combining these images available literature, we constrain over widest sampled frequency range...
We present the results of deep 140 ks Suzaku X-ray observations north-east (NE) radio relic merging galaxy cluster Abell 2255. The temperature structure 2255 is measured out to 0.9 times virial radius (1.9 Mpc) in NE direction for first time. map central region suggests a complex distribution, which agrees with previous work. Additionally, on larger-scale, we confirm that drops from 6 keV around center 3 at outskirts, two discontinuities r ~ 5′ (450 kpc) and ~12′ (1100 center. Their...
We report on a Suzaku measurement of the shock feature associated with western radio relic in merging cluster A3376. The temperature profile is characterized by an almost flat radial shape kT ~ 4 keV within 0.5 r200 and rise about 1 inside relic. Across region (0.6-0.8 r200), shows remarkable drop from 4.7 to 1.3 keV. This clear evidence that really corresponds front possibly caused past major merger. observed sharp changes electron density indicate Mach number M~3. entropy flatter than...
The chemical yields of supernovae and the metal enrichment hot intra-cluster medium (ICM) are not well understood. This paper introduces CHEmical Enrichment RGS Sample (CHEERS), which is a sample 44 bright local giant ellipticals, groups clusters galaxies observed with XMM-Newton. focuses on abundance measurements O Fe using reflection grating spectrometer (RGS). deep exposures size allow us to quantify intrinsic scatter systematic uncertainties in abundances spectral modeling techniques. We...
We present an X-ray spectral analysis of the nearby double radio relic merging cluster Abell 3376 ($z$ = 0.046), observed with $Suzaku$ XIS instrument. These deep ($\sim$360 ks) observations cover entire region in outskirts cluster. diffuse structures are amongst largest and arc-shaped relics combination large-scale shocks a confirm presence stronger shock (${\cal M}_{\rm{W}}$ 2.8 $\pm~0.4$) western direction at $r\sim26$', derived from temperature surface brightness discontinuity across...
Relics are diffuse, highly-polarized radio sources that trace merger-driven shocks at the periphery of merging galaxy clusters. The LOFAR survey recently discovered a rare example double relics in low-mass cluster PSZ2 G181.06+48.47. Through detailed exploration new Chandra and XMM-Newton observations, we reveal G181.06+48.47 has lower mass ($M_{500,X}=2.57^{+0.37}_{-0.38}\times10^{14}$ M$_{\odot}$) than previously thought. Despite its cool global temperature $kT_{500}=3.86^{+0.27}_{-0.29}$...
Abstract Relics are diffuse, highly polarized radio sources that trace merger-driven shocks at the periphery of merging galaxy clusters. The Low Frequency Array survey recently discovered a rare example double relics in low-mass cluster PSZ2 G181.06+48.47. Through detailed exploration new Chandra and XMM-Newton observations, we reveal G181.06+48.47 has lower mass ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi>500,X</mml:mi>...
The Athena+ mission concept is designed to implement the Hot and Energetic Universe science theme submitted European Space Agency in response call for White Papers definition of L2 L3 missions its program. payload consists a large aperture high angular resolution X-ray optics twelve meters away, two interchangeable focal plane instruments: Integral Field Unit (X-IFU) Wide Imager (WFI). X-IFU cryogenic spectrometer, based on array Transition Edge Sensors (TES), offering 2.5 eV spectral...
We observed the northwest region of cluster galaxies Abell 3667 with Suzaku XIS instrument. The temperature and surface brightness intracluster medium were measured up to virial radius ($r_{200}$$\sim$ 2.3 Mpc). radial profile is flatter than average for other clusters until reaches radio relic. drops sharply from 5 keV about 2 at relic region. sharp changes pressure can be interpreted as a shock Mach number 1.9. entropy slope becomes in outer negative around In this region, relaxation...
Abstract Based on Suzaku X-ray observations, we studied the hot gas around NGC 4839 group of galaxies and a radio relic in outskirts Coma cluster. We found gradual decline temperature from 5 keV to 3.6 at relic, across which there is further, steeper drop down 1.5 keV. This as well observed surface brightness profile are consistent with shock Mach number ${\cal M} =$ 2.2 $\pm$ 0.5 velocity $v_{\rm s} (1410 110) km s$^{-1}$. A lower limit $B \gt $ 0.33 $\mu$G was derived based magnetic field...
Context. We present the results from Suzaku observations of merging cluster galaxies CIZA J2242.8+5301 at z = 0.192.