M. Brigitte
A5058702407- Astrophysical Phenomena and Observations
- Mechanics and Biomechanics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Astronomy and Astrophysical Research
- Muscle Physiology and Disorders
- Stellar, planetary, and galactic studies
- Thyroid Cancer Diagnosis and Treatment
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Single-cell and spatial transcriptomics
- Cell Adhesion Molecules Research
- Scientific Measurement and Uncertainty Evaluation
- Organ Transplantation Techniques and Outcomes
- Particle Detector Development and Performance
- RNA Interference and Gene Delivery
- Bone Metabolism and Diseases
- Astronomical Observations and Instrumentation
- Skin Diseases and Diabetes
- Hedgehog Signaling Pathway Studies
- Astrophysics and Star Formation Studies
- Mesenchymal stem cell research
- Cancer Cells and Metastasis
- Wnt/β-catenin signaling in development and cancer
- Myofascial pain diagnosis and treatment
- Astrophysics and Cosmic Phenomena
Czech Academy of Sciences, Astronomical Institute
2023-2024
Charles University
2023-2024
Astronomical Institute of the Slovak Academy of Sciences
2024
Centre de Recherche en Cancérologie de Lyon
2019
University of Rostock
2011
Inserm
2006-2008
Université Paris-Est Créteil
2006
Abstract Black hole X-ray binaries exhibit different spectral and timing properties in accretion states. The outburst of a recently discovered extraordinarily bright source, Swift J1727.8–1613, has enabled the first investigation how polarization source evolve with state. 2–8 keV degree was previously measured by Imaging Polarimetry Explorer (IXPE) to be ≈4% hard intermediate Here we present new IXPE results taken soft state, flux dominated thermal disk emission. We find that dropped...
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...
We present the results of first X-ray polarimetric observation low-mass binary 4U 1957+115, performed with Imaging Polarimetry Explorer in May 2023. The system has been a high-soft spectral state since its discovery and is thought to host black hole. ∼571 ks reveals linear polarisation degree 1.9%±0.6% angle −41.°8±7.°9 2–8 keV energy range. Spectral modelling consistent dominant contribution coming from standard accretion disc, while data suggest significant role returning radiation:...
We present the first X-ray spectropolarimetric results for Cygnus X-1 in its soft state from a campaign of five IXPE observations conducted during 2023 May-June. Companion multiwavelength data are likewise shown. The 2-8 keV X-rays exhibit net polarization degree PD=1.99%+/-0.13% (68% confidence). signal is found to increase with energy across IXPE's bandpass. polarized an energy-independent angle PA=-25.7+/-1.8 deg. East North This consistent being aligned Cyg X-1's AU-scale compact radio...
The mechanisms underlying stromal cell supportive functions are incompletely understood but probably implicate a mixture of cytokines, matrix components and adhesion molecules. Skeletal muscle uses recruited macrophages to support post-injury regeneration. We others have previously shown that secrete mitogenic factors for myogenic cells. Here, we focused on macrophage-elicited survival signals. demonstrated that: (1) macrophage influx is temporally correlated with the disappearance...
We report on the detection of X-ray polarisation in black-hole binary Swift J1727.8$-$1613 during its dim hard spectral state by Imaging Polarimetry Explorer (IXPE). This is first at transition from soft to an binary. find averaged 2$-$8 keV degree (3.3 ${\pm}$ 0.4) % and a corresponding angle 3{\deg} 4{\deg}, which matches detected rising stage outburst, September$-$October 2023, within 1${\sigma}$ uncertainty. The observational campaign complements previous studies this source enables...
Abstract X-ray polarization is a powerful tool to investigate the geometry of accreting material around black holes, allowing independent measurements hole spin and orientation innermost parts accretion disk. We perform spectropolarimetric analysis an binary system in Large Magellanic Cloud, LMC X-3, that hosts stellar-mass hole, known be persistently since its discovery. report first detection X-3 with Imaging Polarimetry Explorer, find average degree (PD) 3.2% ± 0.6% constant angle −42° 6°...
In high-mass X-ray binaries (HMXBs), the compact object accretes strong stellar wind of an O-B supergiant companion star. flux variations alter wind's ionization state and optical line profiles, which are important in determination orbital parameters system. We analyzed state-dependent variability profiles by separating components coming from star’s atmosphere accreted stream matter located between star accretion disk (i.e. focused wind). then determined radial velocities intensities...
In high-mass X-ray binaries (HMXBs), the compact object accretes strong stellar wind of an O-B supergiant companion star. flux variations alter wind's ionization state and optical line profiles, which are key in determination orbital parameters system. Using method Fourier Disentangling, we decomposed spectral contributions from atmosphere close to photosphere accreted stream matter (i.e. focused wind). High-resolution spectroscopy Cyg X-1 its hard soft-intermediate states revealed...
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) October 2022. The measured polarization is below minimum detectable 1.1 per cent (at 99 confidence level). Simultaneously, source was observed with NICER, NuSTAR and SRG/ART-XC instruments, which enabled spectral decomposition into a dominant thermal component Comptonized one. low 2-8 keV did not allow for strong constraints black-hole spin...
We report on the detection of X-ray polarisation in black-hole binary Swift J1727.8−1613 during its dim hard spectral state by Imaging Polarimetry Explorer (IXPE). This is first at transition from soft to an binary. find averaged 2–8 keV degree (3.3 ± 0.4)% and a corresponding angle 3° ±4°, which matches detected rising stage outburst, September–October 2023, within 1 σ uncertainty. The observational campaign complements previous studies this source enables comparison properties single...
X-ray polarization is a powerful tool to investigate the geometry of accreting material around black holes, allowing independent measurements hole spin and orientation innermost parts accretion disk. We perform spectro-polarimetric analysis an binary system in Large Magellanic Cloud, LMC X-3, that hosts stellar-mass hole, known be persistently since its discovery. report first detection X-3 with Imaging Polarimetry Explorer, find average degree 3.2% +- 0.6% constant angle -42 deg 6 over 2-8...
We present the results of first X-ray polarimetric observation low-mass binary 4U 1957+115, performed with Imaging Polarimetry Explorer in May 2023. The system has been a high-soft spectral state since its discovery and is thought to host black hole. $\sim$571 ks reveals linear polarisation degree $1.9\% \pm 0.6\%$ angle $-41^\circ.8 7^\circ.9$ 2-8 keV energy range. Spectral modelling consistent dominant contribution coming from standard accretion disc, while data suggest significant role...