A5063827319- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Astronomical Observations and Instrumentation
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- History and Developments in Astronomy
- Mechanics and Biomechanics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Scientific Measurement and Uncertainty Evaluation
- Astro and Planetary Science
- Radioactive Decay and Measurement Techniques
- Calibration and Measurement Techniques
- Cosmology and Gravitation Theories
- Relativity and Gravitational Theory
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Galaxies: Formation, Evolution, Phenomena
- Experimental and Theoretical Physics Studies
European Space Astronomy Centre
2009-2022
Centre National de la Recherche Scientifique
2009-2016
Université Savoie Mont Blanc
2016
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2013-2016
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2003-2009
CEA Paris-Saclay
2003-2009
Université Paris Cité
2005-2009
Laboratoire AstroParticule et Cosmologie
2005-2009
DSM (Netherlands)
2004-2009
Institut de Recherche sur les Lois Fondamentales de l'Univers
2004-2009
The most recent LHC data have provided a considerable improvement in the precision with which various Higgs production and decay channels been measured. Using all available public results from ATLAS, CMS Tevatron, we derive for each final state combined confidence level contours signal strengths ($\mathrm{\text{gluon fusion}}+\mathrm{\text{top-quark}}$ pair associated production) versus ($\mathrm{\text{vector boson fusion}}+$ vector bosons) space. These ``combined strength ellipses'' can be...
In this paper, we report on the fourth soft gamma-ray source catalog obtained with IBIS imager board INTEGRAL satellite. The scientific data set is based more than 70 Ms of high-quality observations performed during first five and a half years Core Program public observations. Compared to previous surveys, includes substantially increased coverage extragalactic fields, comprises 700 high-energy sources detected in energy range 17–100 keV, including both transients faint persistent objects...
In this paper we report on the third soft gamma-ray source catalog obtained with IBIS/ISGRI imager board INTEGRAL satellite. The scientific data set is based more than 40 Ms of high-quality observations performed during first 3.5 yr Core Program and public observations. Compared to previous surveys, includes a substantially increased coverage extragalactic fields, comprises 400 high-energy sources detected in energy range 17-100 keV, including both transients faint persistent objects that...
We present the result of a study X-ray emission from Galactic Centre (GC) Molecular Clouds (MC) within 15 arcmin Sgr A*. use XMM-Newton data (about 1.2 Ms observation time) spanning about 8 years. The MC spectra show all features characteristic reflection: i) intense Fe Kalpha, with EW 0.7-1 keV, and associated Kbeta line; ii) flat power law continuum iii) significant K edge (tau~0.1-0.3). diffuse low ionisation follows distribution, nevertheless not are emitters. long baseline monitoring...
The deepest XMM–Newton mosaic map of the central 1| $_{.}^{\circ}$|5 Galaxy is presented, including a total about 1.5 Ms EPIC-pn cleaned exposures in 15 arcsec and 200 ks outside. This compendium presents broad-band X-ray continuum maps, soft intensity decomposition into spectral components comparison maps with emission at other wavelengths. Newly discovered extended features, such as supernova remnants (SNRs), superbubbles filaments are reported. We provide an atlas features within ±1° Sgr...
(abridged) We describe highlights of the results two observing campaigns in 2004 to investigate correlation flare activity Sgr A* different wavelength regimes, using a total nine ground and space-based telescopes. report detection several new near-IR flares during campaign based on {\it HST} observations. The level can be as low $\sim0.15$ mJy at 1.6 $μ$m continuous up about 40% time. Using NICMOS instrument HST}, XMM-Newton} CSO observatories, we also detect simultaneous bright X-ray which...
In this paper we report the second soft gamma-ray source catalog obtained with IBIS/ISGRI imager on board INTEGRAL satellite. The scientific data set is based more than 10 Ms of high-quality observations performed during first 2 years Core Program and public observations, covers ~50% whole sky. main aim survey was to scan systematically, for time at energies above 20 keV, Galactic plane achieve a limiting sensitivity ~1 mcrab in central radian. target year mission lifetime expand as much...
The center of our Galaxy harbors a four million solar mass black hole that is unusually quiet: its present X-ray luminosity more than 10 orders magnitude less Eddington luminosity. observation iron fluorescence and hard emission from some the massive molecular clouds surrounding Galactic has been interpreted as an echo past 1039 erg s-1 flare. Alternatively, low-energy cosmic rays propagating inside might account for observed emission, through inverse bremsstrahlung ions or electrons. Here,...
Context. Our Galaxy hosts at its dynamical center Sgr A*, the closest supermassive black hole. Surprisingly, luminosity is several orders of magnitude lower than Eddington luminosity. However, recent observations occasional rapid X-ray flares from A* provide constraints on accretion and radiation mechanisms work close to event horizon.
Analysis of International Gamma-Ray Astrophysics Laboratory (INTEGRAL) Core Programme and public open-time observations performed up to 2005 April provides a sample 62 active galactic nuclei in the 20-100 keV band above flux limit ~1.5 × 10-11 ergs cm-2 s-1. Most (42) sources are Seyfert galaxies, almost equally divided between type 1 2 objects; six blazars, 14 still unclassified. Excluding average redshift our is 0.021, while mean luminosity log L = 43.45. We find that absorption present...
The European Space Agency's INTErnational Gamma-Ray Astrophysics Laboratory (ESA/INTEGRAL) was launched aboard a Proton-DM2 rocket on 17 October 2002 at 06:41 CEST, from Baikonur in Kazakhstan. Since then, INTEGRAL has been providing long, uninterrupted observations (up to about 47 h, or 170 ksec, per satellite orbit of 2.7 days) with large field-of-view (FOV, fully coded: 100 deg2), millisecond time resolution, keV energy polarization measurements, as well additional wavelength coverage...
Investigating the spectral and temporal characteristics of X-rays coming from Sagittarius A* (Sgr A*) is essential to our development a more complete understanding emission mechanisms in this supermassive black hole located at center Galaxy. Several X-ray flares with varying durations features have already been observed object. Here we present results two long XMM-Newton observations Galactic nucleus carried out 2004, for total exposure time nearly 500 ks. During these detected Sgr peak 2-10...
The Ibis/Isgri imager on Integral detected for the first time a hard X-ray source, IGR J17456-2901, located within 1' of Sgr A* over energy range 20-100 keV. Here we present results detailed analysis ~7 Ms observations GC. With an effective exposure 4.7 have obtained more stringent positional constraints this HE source and constructed its spectrum in 20-400 Furthermore, by combining Isgri with total corresponding to same physical region around SgrA* from XMM data, collected during part...
We present the longest, by a factor of 2, near-infrared light curve from Sgr A*—the supermassive black hole in Galactic center. Achieved combining Keck and VLT data one common night, which fortuitously had simultaneous Chandra SMA data, this is used to address two outstanding problems. First, putative quasi-periodicity ~20 minutes reported groups using ESO's not confirmed observations. Second, while infrared mm regimes are thought be related based on time lags between curves wavelength...
The radiative counterpart of the supermassive black hole at Galactic center (GC), Sgr A*, is subject to frequent flares visible simultaneously in X-rays and near-infrared (NIR). Often, enhanced radio variability from centimeter sub-millimeter wavelengths observed follow these X-ray/NIR eruptions. We present here a multi-wavelength campaign carried out April 2009, with aim characterizing this broadband flaring activity. Concurrent data XMM-Newton/EPIC (2-10 keV), VLT/NACO (2.1 microns, 3.8...
We report the association of INTEGRAL source IGR J18027-2016 with BeppoSAX SAX J1802.7-2017. is seen to be a weak, persistent by IBIS/ISGRI instrument on board an average count rate 0.58 counts s-1 (~6.4 mCrab) in 20-40 keV band. Timing analysis performed ISGRI data identifies orbital period days and gives ephemeris mid-eclipse as, MJD. Re-analysis archival has provided mass function for donor star, projected semimajor axis lt-s. conclude that OB-supergiant 18.8-29.3 radius 15.0-23.4 ....
We have completed the one-loop renormalisation of Next-to-Minimal Supersymmetric Standard Model (NMSSM) allowing for and comparing between different schemes. A special attention is paid to on-shell study a variety these schemes based on alternative choices physical input parameters. In this paper we present our approach NMSSM report results neutralino-chargino sfermion sectors. will borrow some from Higgs sector whose full discussion left separate publication. implemented set up all sectors...
We present the highly significant detection of a quasi-periodic fbx modulation with period 22.2min seen in X-ray data Sgr A* flare 2004 August 31. This flaring event, which lasted total about three hours, was detected simultaneously by EPIC on XMM-Newton and NICMOS near-infrared camera HST. Given inherent difficulty in, lack readily available methods for quantifying probability periodic signal over only several cycles set where red noise can be important, we developed general method...