É. Falgarone
A5090259393- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Gas Dynamics and Kinetic Theory
- Fluid Dynamics and Turbulent Flows
- Cold Atom Physics and Bose-Einstein Condensates
- Radio Astronomy Observations and Technology
- Advanced Combustion Engine Technologies
- Advanced Chemical Physics Studies
- Combustion and flame dynamics
- Phase Equilibria and Thermodynamics
- Atmospheric and Environmental Gas Dynamics
Université Paris Sciences et Lettres
1991-2024
Centre National de la Recherche Scientifique
2014-2024
Sorbonne Université
2014-2024
Laboratoire de Physique de l'ENS
2008-2024
École Normale Supérieure - PSL
2013-2024
Université Paris Cité
2015-2024
Sorbonne Paris Cité
2020-2024
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2010-2022
Délégation Paris 7
2019-2021
Centre de Recherche en Astronomie Astrophysique et Géophysique
2020
The European Space Agency's Planck satellite, which was dedicated to studying the early Universe and its subsequent evolution, launched on 14 May 2009. It scanned microwave submillimetre sky continuously between 12 August 2009 23 October 2013, producing deep, high-resolution, all-sky maps in nine frequency bands from 30 857GHz. This paper presents cosmological legacy of Planck, currently provides our strongest constraints parameters standard model some tightest limits available deviations...
We present the all-sky Planck catalogue of Sunyaev-Zeldovich (SZ) sources detected from 29 month full-mission data. The (PSZ2) is largest SZ-selected sample galaxy clusters yet produced and deepest clusters. It contains 1653 detections, which 1203 are confirmed with identified counterparts in external data-sets, first cluster survey containing > $10^3$ a detailed analysis selection function terms its completeness statistical reliability, placing lower limit 83% on purity. Using simulations,...
The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14~May 2009 scanned microwave submillimetre sky continuously between 12~August 23~October 2013. In February~2015, ESA Collaboration released second set of cosmology products based on data from entire mission, including both temperature polarization, along with a scientific technical papers web-based explanatory supplement. This paper gives an overview main...
We present cluster counts and corresponding cosmological constraints from the Planck full mission data set. Our catalogue consists of 439 clusters detected via their Sunyaev-Zeldovich (SZ) signal down to a signal-to-noise ratio 6, is more than factor 2 larger 2013 cosmology sample. The are consistent with those yield compatible under same modelling assumptions. Taking advantage catalogue, we extend our analysis two-dimensional distribution in redshift signal-to-noise. use mass estimates two...
The only direct measurements of interstellar magnetic field strengths depend on the Zeeman effect, which samples line-of-sight component Bz vector. In this paper, we use a Bayesian approach to analyze observed probability density function (PDF) from surveys H i, OH, and CN spectral lines in order infer density-dependent stochastic model total strength B diffuse molecular clouds. We find that at n < 300 cm−3 (in medium sampled by i lines), does not scale with density. This suggests clouds are...
Interstellar molecular clouds have power-law size L and mass M distributions of the form n(L) dL = L−αL n(M) dM M−αM dM, where ∝ Lk is also a power law. These relations are shown to result from fractal scale-free nature interstellar gas with indices that independent distance. The results αL 1 + D αM D/κ for dimension 2.3 ± 0.3 value κ in range 2.4-3.7, as determined cloud surveys literature. same expected relation when M(L) correlation includes many different surveys, spanning 1010 mass....
In diffuse interstellar clouds the chemistry that leads to formation of oxygen bearing ions OH+, H2O+, and H3O+ begins with ionization atomic hydrogen by cosmic rays, continues through subsequent abstraction reactions involving H2. Given these reaction pathways, observed abundances molecules are useful in constraining both total cosmic-ray rate (zeta_H) molecular fraction, f(H2). We present observations targeting transitions made Herschel Space Observatory along 20 Galactic sight lines...
PRISM (Polarized Radiation Imaging and Spectroscopy Mission) was proposed to ESA in May 2013 as a large-class mission for investigating within the framework of Cosmic Vision program set important scientific questions that require high resolution, sensitivity, full-sky observations sky emission at wavelengths ranging from millimeter-wave far-infrared. PRISM's main objective is explore distant universe, probing cosmic history very early times until now well structures, distribution matter,...
We present the results of first extensive mid-infrared (IR) imaging survey ρ Ophiuchi embedded cluster, performed with ISOCAM camera on board ISO satellite. The main Ophiuchimolecular cloud L1688, as well two secondary clouds L1689N and L1689S, have been completely surveyed for point sources at 6.7 μm 14.3 μm. A total 425 are detected in ~0.7 deg2, including 16 Class I, 123 II, 77 III young stellar objects (YSOs). Essentially all mid-IR coincide near-IR sources, but a large proportion them...
view Abstract Citations (329) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Edges of Molecular Clouds: Fractal Boundaries and Density Structure Falgarone, E. ; Phillips, T. G. Walker, C. K. spatial structure the dense interstellar medium is examined on basis observations clouds carried out at two different distances using several transitions carbon monoxide molecule. It found that exists all scales down to best angular resolution (0.02)...
view Abstract Citations (332) References (68) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Einstein observations of the Rho Ophiuchi dark cloud : an X-ray christmas tree. Montmerle, T. ; Koch-Miramond, L. Falgarone, E. Grindlay, J. The results obtained by extensive Observatory investigation region, emphasizing findings pertaining to densest part cloud. and specific features data analysis are briefly described, space distribution sources in is discussed,...
We report the detection of absorption lines by reactive ions OH<sup>+<sup/>, H<sub>2<sub/>O<sup>+<sup/>and H<sub>3<sub/>O<sup>+<sup/> along line sight to submillimeter continuum source G10.6–0.4 (W31C). used <i>Herschel<i/> HIFI instrument in dual beam switch mode observe ground state rotational transitions OH<sup>+<sup/> at 971 GHz, H<sub>2<sub/>O<sup>+<sup/> 1115 and 607 984 GHz. The resultant spectra show deep over a broad velocity range that originates interstellar matter as well...
We report the detection of absorption by interstellar hydroxyl cations and water cations, along sight-line to bright continuum source W49N. have used Herschel's HIFI instrument, in dual beam switch mode, observe 972 GHz N = 1 - 0 transition OH+ 1115 1(11) 0(00) ortho-H2O+. The resultant spectra show ortho-H2O+, strong OH+, foreground material at velocities range 70 km/s with respect local standard rest. inferred OH+/H2O+ abundance ratio ranges from ~ 3 15, implying that observed arises...
Aims. Magnetic fields play a primordial role in the star formation process. The Zeeman effect on CN radical lines is one of few methods measuring magnetic dense gas regions.
We report observations of three rotational transitions molecular oxygen (O2) in emission from the H2 Peak 1 position vibrationally excited hydrogen Orion. observed 487 GHz, 774 and 1121 GHz lines using HIFI on Herschel Space Observatory, having velocities 11 km s-1 to 12 widths 3 s-1. The beam-averaged column density is N(O2) = 6.5\times1016 cm-2, assuming that source has an equal beam filling factor for all (beam 44, 28, 19"), relative line intensities imply a kinetic temperature between 65...
<i>Aims. <i/>Supersonic turbulence is a large reservoir of suprathermal energy in the interstellar medium. Its dissipation, because it intermittent space and time, can deeply modify chemistry gas. This clearly seen framework shock chemistry. Intense turbulent dissipation also occurs regions velocity shears, sharing with shocks property intermittency. Whether these bursts short-lived localized, have measurable impact on molecular abundances diffuse medium, how chemical enrichment they drive...
We examine the cloud structure around Planck detections in 71 fields observed with Herschel SPIRE instrument. wish to determine general physical characteristics of and morphology clouds where cold high column density clumps are found. derive colour temperature maps fields. infrared spectral energy distributions main clumps. The categorised according their large scale morphology. With help recently released WISE satellite data, we look for signs enhanced mid-infrared scattering (coreshine),...
Aims. We describe the assignment of a previously unidentified interstellar absorption line to ArH+ and discuss its relevance in context hydride diffuse gas with low H2 fraction. The confidence is discussed, column densities are determined toward several lines sight. results then discussed framework chemical models, aim explaining observed densities.
We present initial results from the Herschel GT key program: observations of EXtra-Ordinary Sources (HEXOS) and outline promise potential spectral surveys with Herschel/HIFI. The HIFI instrument offers unprecedented sensitivity, as well continuous coverage across gaps imposed by atmosphere, opening up a largely unexplored wavelength regime to high-resolution spectroscopy. show spectrum Orion KL between 480 560 GHz 1.06 1.115 THz. From these data, we confirm that separately measures dust...