G. Branduardi‐Raymont
A5114374655- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Calibration and Measurement Techniques
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Advanced X-ray Imaging Techniques
- Scientific Measurement and Uncertainty Evaluation
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Earthquake Detection and Analysis
University College London
2016-2025
Planetary Science Institute
2023
University of Palermo
2018
National Institute for Astrophysics
2018
Nature Inspires Creativity Engineers Lab
2016
UCL Australia
1981-2014
Space Telescope Science Institute
2012
Cosine (Netherlands)
2009
Mars Space (United Kingdom)
2000-2008
SRON Netherlands Institute for Space Research
2007
The ESA X-ray Multi Mirror mission, XMM-Newton, carries two identical Reflection Grating Spectrometers (RGS) behind of its three nested sets Wolter I type mirrors. instrument allows high-resolution ( to 500) measurements in the soft range (6 38 Åor 2.1 0.3 keV) with a maximum effective area about 140 cm2 at 15 Å. Its design is optimized for detection K-shell transitions carbon, nitrogen, oxygen, neon, magnesium, and silicon, as well L shell iron. present paper gives full description RGS...
This White Paper, submitted to the recent ESA call for science themes define its future large missions, advocates need a transformational leap in our understanding of two key questions astrophysics: 1) How does ordinary matter assemble into scale structures that we see today? 2) do black holes grow and shape Universe? Hot gas clusters, groups intergalactic medium dominates baryonic content local Universe. To understand astrophysical processes responsible formation assembly these structures,...
Supermassive black holes in the nuclei of active galaxies expel large amounts matter through powerful winds ionized gas. The archetypal galaxy NGC 5548 has been studied for decades, and high-resolution X-ray UV observations have previously shown a persistent outflow. An observing campaign 2013 with six space observatories shows nucleus to be obscured by long-lasting, clumpy stream gas never seen before. It blocks 90% soft emission causes simultaneous deep, broad absorption troughs. outflow...
The X-ray Integral Field Unit (X-IFU) is the high resolution spectrometer of ESA Athena observatory. Over a field view 5' equivalent diameter, it will deliver spectra from 0.2 to 12 keV with spectral 2.5 eV up 7 on ∼ 5" pixels. X-IFU based large format array super-conducting molybdenum-gold Transition Edge Sensors cooled at 90 mK, each coupled an absorber made gold and bismuth pitch 249 μm. A cryogenic anti-coincidence detector located underneath prime TES enables non background be reduced....
We collate the results of recent high resolution X-ray spectroscopic observations 23 AGN, and use resulting information to try provide answers some main open questions about warm absorbers: where do they originate, what effect have on their host galaxies, is importance within energetics dynamics AGN system as a whole? find that absorbers nearby Seyferts certain QSOs are most likely originate in outflows from dusty torus, kinetic luminosity these accounts for well under 1% bolometric...
We present spatially resolved X-ray spectra taken with the EPIC cameras of XMM-Newton a sample 17 cooling clusters and three non-cooling for comparison. The deprojected are analyzed multi-temperature model, independent any priori assumptions about physics behind heating mechanisms. All show central decrement average temperature, most them factor . Three (Sérsic 159-3, MKW 3s Hydra A) only weak temperature decrement, while two others (A 399 A 2052) have very strong decrement. pressure...
EXOSAT observations of the spectrum Seyfert 1 galaxy MKN 841 show that it is well-fitted by a power law photon index 1.6, similar to other Seyferts, and large additional soft component. The X-ray luminosity over observed band exceeds |$4\times{10}^{44}\,\text{erg}\,\text{s}^{-1}$|. A single-temperature blackbody fit X-rays short-wavelength ultraviolet continuum gives |$2\times{10}^{46}\,\text{erg}\,\text{s}^{-1}$| while an accretion disc fitted same points...
The first all-sky survey for cosmic sources of extreme-ultraviolet radiation has been carried out with the UK Wide Field Camera on ROSAT. A reduction data yielded a catalogue 383 relatively bright EUV sources, forming WFC Bright Source Catalogue. This represents 30-fold increase in number astrophysical objects detected ~ 60–200 eV energy band and covers flux range, each two bands, more than 2000. search (typically 1-arcmin) error circles using variety catalogues SIMBAD base, identified...
An extensive multi-satellite campaign on NGC 5548 has revealed this archetypal Seyfert-1 galaxy to be in an exceptional state of persistent heavy absorption. Our observations taken 2013-2014 with XMM-Newton, Swift, NuSTAR, INTEGRAL, Chandra, HST and two ground-based observatories have together enabled us establish that unexpected phenomenon is caused by outflowing stream weakly ionised gas (called the obscurer), extending from vicinity accretion disk broad-line region. In work we present...
We present the analysis of XMM-Newton and Swift optical-UV X-ray observations Seyfert-1/QSO Mrk 509, part an unprecedented multi-wavelength campaign, investigating nuclear environment this AGN. The data are from a series 10 about 60 ks each, spaced each other by 4 days, taken in Oct-Nov 2009. During our 509 was also observed with for period 100 monitoring behaviour source before after observations. With these we have established continuum spectrum bands investigated its variability on...
The X-ray Integral Field Unit (X-IFU) on board the Advanced Telescope for High-ENergy Astrophysics (Athena) will provide spatially resolved high-resolution spectroscopy from 0.2 to 12 keV, with 5 arc second pixels over a field of view minute equivalent diameter and spectral resolution 2.5 eV up 7 keV. In this paper, we first review core scientific objectives Athena, driving main performance parameters X-IFU, namely resolution, view, effective area, count rate capabilities, instrumental...
(Abridged) The simultaneous UV to X-rays/gamma rays data obtained during the multi-wavelength XMM/INTEGRAL campaign on Seyfert 1 Mrk 509 are used in this paper and tested against physically motivated broad band models. Each observation has been fitted with a realistic thermal comptonisation model for continuum emission. Prompted by correlation between soft X-ray flux, we use component excess. X-rays/gamma-rays emission of can be well these components. presence relatively hard high-energy...
Both heliophysics and planetary physics seek to understand the complex nature of solar wind's interaction with system obstacles like Earth's magnetosphere, ionospheres Venus Mars, comets. Studies this objective are frequently conducted help single or multipoint in situ electromagnetic field particle observations, guided by predictions both local global numerical simulations, placed context observations from far extreme ultraviolet (FUV, EUV), hard X-ray, energetic neutral atom imagers (ENA)....
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....
The RS CVn binary system HR 1099 was extensively observed by the XMM-Newton observatory in February 2000 as its first-light target. A total of 570 ks exposure time accumulated with Reflection Grating Spectrometers (RGS). integrated X-ray spectrum between 5-35 Åis unprecedented quality and shows numerous features attributed to transitions elements C, N, O, Ne, Mg, Si, S, Fe, Ni. We perform an in-depth study elemental composition average corona this system, find that abundances strongly depend...
A long 280 ks observation of the Seyfert 1 galaxy NGC 3783 with XMM-Newton is reported. We focus on oxygen line complex between 17 and 24 Å as measured Reflection Grating Spectrometer. Accurate absorption column densities emission-line fluxes are obtained. explore several options for geometry physical form emitting absorbing gas. The lack change in ionization absorber despite an increase continuum flux during restricts high-ionization (O-K) low-ionization (Fe-M) gas to distances at least 0.5...
The spectral properties of a sample six low-mass X-ray binaries are studied using data obtained with the Gas Scintillation Proportional Counter (GSPC) on EXOSAT. various continuum models proposed for these sources investigated. Only two-component provide an acceptable fit to data. Two possible model combinations were found: in both cases one component was blackbody other either thermal bremsstrahlung or unsaturated Comptonized spectrum low-energy photons high-energy electrons. characteristic...