Frédéric Marin
A5101816291- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Mechanics and Biomechanics Studies
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Star Formation Studies
- Scientific Measurement and Uncertainty Evaluation
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Advanced X-ray and CT Imaging
- Particle physics theoretical and experimental studies
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Hydraulic flow and structures
- Crystallography and Radiation Phenomena
- Advanced X-ray Imaging Techniques
Observatoire astronomique de Strasbourg
2013-2024
Université de Strasbourg
2012-2024
Centre National de la Recherche Scientifique
2007-2024
Marshall Space Flight Center
2022
Roma Tre University
2022
Czech Academy of Sciences, Astronomical Institute
2017
Capgemini (Netherlands)
2016
Institut National de Physique Nucléaire et de Physique des Particules
2007
Centre de physique des particules de Marseille
2007
Aix-Marseille Université
2007
Launched on 2021 December 9, the Imaging X-ray Polarimetry Explorer (IXPE) is a NASA Small Mission in collaboration with Italian Space Agency (ASI). The mission will open new window of investigation—imaging x-ray polarimetry. observatory features three identical telescopes, each consisting mirror module assembly polarization-sensitive imaging detector at focus. A coilable boom, deployed orbit, provides necessary 4-m focal length. utilizes three-axis-stabilized spacecraft, which services such...
A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto hole, which heats the sufficiently to emit x-rays. We report polarimetric observation of XRB Cygnus X-1 using Imaging Polarimetry Explorer. The electric field position angle aligns with outflowing jet, indicating that jet launched inner emitting region. polarization degree (4.01+-0.20)% at 2 8 kiloelectronvolts, implying accretion disk viewed closer edge-on than orbit. observations reveal...
We report on the first detection of linearly polarized x-ray emission from an ultra-magnetized neutron star with Imaging X-ray Polarimetry Explorer (IXPE). The IXPE 35 observations anomalous pulsar 4U 0142+61 reveal a linear polarization degree $(12\pm 1)\%$ throughout 2--8 keV band. detect substantial variation energy: is $(14\pm at 2--4 and $(41\pm 7)\%$ 5.5--8 keV, while it drops below instrumental sensitivity around 4--5 where angle swings by $\sim 90^\circ$. give us completely new...
We report on a comprehensive analysis of simultaneous X-ray polarimetric and spectral data the bright atoll source GX 9+9 with Imaging Polarimetry Explorer (IXPE) NuSTAR. The is significantly polarized in 4--8 keV band, degree $2.2\% \pm 0.5\%$ (uncertainty at 68% confidence level). NuSTAR broad-band spectrum clearly shows an iron line, well described by model including thermal disk emission, Comptonized component, reflection. From spectro-polarimetric fit, we obtain upper limit to...
ABSTRACT We report on an X-ray polarimetric observation of the high-mass binary LMC X-1 in high/soft state, obtained by Imaging Polarimetry Explorer (IXPE) 2022 October. The measured polarization is below minimum detectable 1.1 per cent (at 99 confidence level). Simultaneously, source was observed with Neutron Star Interior Composition (NICER), Nuclear Spectroscopic Telescope Array (NuSTAR), and Spectrum-Rontgen-Gamma (SRG)/Astronomical Roentgen – Concentrator (ART-XC) instruments, which...
ABSTRACT We report spectro-polarimetric results of an observational campaign the bright neutron star low-mass X-ray binary Cyg X-2 simultaneously observed by IXPE, NICER, and INTEGRAL. Consistently with previous results, broad-band spectrum is characterized a lower-energy component, attributed to accretion disc kTin ≈ 1 keV, plus unsaturated Comptonization in thermal plasma temperature kTe = 3 keV optical depth τ 4, assuming slab geometry. measure polarization degree 2–8 band P 1.8 ± 0.3 per...
ABSTRACT We report on the second observation of radio-quiet active galactic nucleus MCG-05-23-16 performed with Imaging X-ray Polarimetry Explorer (IXPE). The started 2022 November 6 for a net observing time 640 ks, and was partly simultaneous NuSTAR (86 ks). After combining these data those obtained in first IXPE pointing May (simultaneous XMM–Newton NuSTAR) we find 2–8 keV polarization degree Π = 1.6 ± 0.7 (at 68 per cent confidence level), which corresponds to an upper limit 3.2 99...
X-ray polarimetry is a unique way to probe the geometrical configuration of highly magnetized accreting neutron stars (X-ray pulsars). GRO J1008−57 first transient pulsar observed at two different flux levels by Imaging Polarimetry Explorer (IXPE) during its outburst in November 2022. We find polarization properties be independent luminosity, with degree varying between nondetection and about 15% over pulse phase. Fitting phase-resolved spectro-polarimetric data rotating vector model allowed...
We model the spectropolarimetric signature resulting from radiative coupling between innermost parts of active galactic nuclei (AGNs). use a new public version STOKES, Monte Carlo transfer code presented in first paper this series. The has been significantly improved for computational speed and polarization imaging implemented. couple continuum sources with equatorial scattering regions, polar outflows, toroidal obscuring dust we study polarization. compute grid thermal AGN models different...
How black holes consume and eject matter has been the subject of intense studies for more than 60 years. The luminosity these systems are often compared to Eddington limit, border at which spherical accretion is inhibited by radiation pressure photons it produces. discovery ultraluminous X-ray sources (ULXs) showed that can proceed even when apparent exceeds limit (Kaaret et al. 2017). High might be produced beaming incident a thick collimated outflow or truly super-Eddington flow. However,...
We report on Imaging X-ray polarimetry explorer (IXPE) observations of the Be-transient pulsar LS V +44 17/RX J0440.9+4431 made at two luminosity levels during giant outburst in January–February 2023. Considering observed spectral variability and changes pulse profiles, source was likely caught supercritical subcritical states with significantly different emission-region geometry, associated presence accretion columns hot spots, respectively. focus here pulse-phase-resolved polarimetric...
Accreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected polarize the emission up a degree of ∼80%. However, such expectations being challenged by recent observations XRPs with Imaging Polarimeter Explorer (IXPE). Here, we report on results yet another XRP, namely, EXO 2030+375, observed IXPE and contemporarily monitored Insight-HXMT SRG/ART-XC. In line obtained similar sources, an analysis 2030+375 data...
We report the discovery of X-ray polarization from X-ray-bright filament G0.13−0.11 in Galactic center (GC) region. This features a bright, hard source that is most plausibly pulsar wind nebula (PWN) and an extended structured diffuse component. Combining signal IXPE with imaging/spectroscopic data Chandra , we find emission highly polarized PD = 57(±18)% 3−6 keV band, while angle PA 21 ° ( ± 9 ). high degree proves synchrotron origin G0.13−0.11. In turn, measured implies approximately...
[Abridged] In our previous work on Ark 120, we found that its 2014 X-ray spectrum is dominated by Comptonisation, while the relativistic reflection emission only originates at tens of $R_{\rm g}$ from SMBH. As a result, could not constrain SMBH spin disc alone. Our aim to determine an alternative technique based global energetics disc-corona system. The spectral analysis uses simultaneous XMM-Newton (OM and pn) NuSTAR observations March 22 2013 February 18. We applied optxconv model (based...
Large energy-dependent X-ray polarization degree is detected by the Imaging Polarimetry Explorer ({IXPE}) in high-soft emission state of black hole binary 4U 1630--47. The highly significant detection (at $\approx50\sigma$ confidence level) an unexpectedly high polarization, rising from $\sim6\%$ at $2$ keV to $\sim10\%$ $8$ keV, cannot be easily reconciled with standard models thin accretion discs. In this work we compare predictions different theoretical {IXPE} data and conclude that...
Infrared, optical and ultraviolet spectropolarimetric observations have proven to be ideal tools for the study of hidden nuclei type-2 active galactic (AGN) constraining composition morphology sub-parsec scale emission components. In this paper, we extend analysis polarization X-rays from AGN. Combining two radiative transfer codes, performed first simulations photons originating in gravity dominated vicinity black hole scattering structures all way out parsec-scale torus polar winds. We...
Scheduled to launch in late 2021, the Imaging X-ray Polarimetry Explorer (IXPE) is a NASA Small Mission collaboration with Italian Space Agency (ASI). The mission will open new window of investigation - imaging polarimetry. observatory features 3 identical telescopes each consisting mirror module assembly polarization-sensitive detector at focus. A coilable boom, deployed on orbit, provides necessary 4-m focal length. utilizes 3-axis-stabilized spacecraft which services such as power,...
Thousands of exoplanets have been detected, but only one exoplanetary transit was potentially observed in X-rays from HD 189733A. What makes the detection so difficult this band? To answer question, we run Monte-Carlo radiative transfer simulations to estimate amount X-ray flux reprocessed by 189733b. Despite its extended evaporating atmosphere, find that absorption radius 189733b at 0.7 keV, which is mean energy photons detected 0.25–2 keV band XMM-Newton, ∼1.01 times planetary for an...
Recent observations of X-ray pulsars (XRPs) performed by the Imaging Polarimetry Explorer have made it possible to investigate intricate details these objects in a new way, thanks added value polarimetry. Here we present results member small group XRPs displaying super-orbital variability. was observed three separate times during high state its period. The luminosity 2--8 keV energy band $L $ makes brightest XRP ever We detect significant polarization all observations, with values...
Context. Optical observations cannot resolve the structure of active galactic nuclei (AGN), and a unified model for AGN was inferred mostly from indirect methods, such as spectroscopy variability studies. reverberation mapping allowed us to constrain spatial dimension broad emission line region thereby measure mass supermassive black holes. Recently, also applied polarized signal emerging different components. In principle, this should allow dimensions sub-parsec reprocessing media. Aim. We...
Context. ESO 141-G55 is a nearby X-ray bright broad-line Seyfert 1 (BLS1) that has been classified as bare active galactic nucleus (AGN) due to lack of warm absorption along its line sight, providing an unhampered view into disc-corona system. Aims. We aim probe system thanks the first simultaneous XMM-Newton and NuSTAR observation obtained October 1–2, 2022. Methods. carried out broadband spectral analysis determine dominant process(es) at work well energy distribution (SED) properties....