A5001741087- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Superconducting and THz Device Technology
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Intracranial Aneurysms: Treatment and Complications
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Cerebrovascular and Carotid Artery Diseases
- Acute Ischemic Stroke Management
- Adaptive optics and wavefront sensing
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Vascular Malformations Diagnosis and Treatment
- Atmospheric Ozone and Climate
- Dark Matter and Cosmic Phenomena
- Traumatic Brain Injury and Neurovascular Disturbances
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Intracerebral and Subarachnoid Hemorrhage Research
- Scientific Research and Discoveries
Center for Astrophysics Harvard & Smithsonian
2022-2024
University of Pennsylvania
2018-2024
Centre National de la Recherche Scientifique
2020-2024
École Normale Supérieure - PSL
2022-2024
Sorbonne Université
2022-2024
Université Paris Sciences et Lettres
2022-2024
Université Paris Cité
2024
TD Bank
2021-2023
Institut de Radioastronomie Millimétrique
2016-2022
UPMC Hamot
2018-2022
Millimeter-wave continuum astronomy is today an indispensable tool for both general Astrophysics studies and Cosmology. General purpose, large field-of-view instruments are needed to map the sky at intermediate angular scales not accessible by high-resolution interferometers coarse resolution space-borne or ground-based surveys. These have be installed focal plane of largest single-dish telescopes. In this context, we constructed deployed a multi-thousands pixels dual-band (150 260 GHz,...
Context. In recent decades, direct imaging has confirmed the existence of substellar companions (exoplanets or brown dwarfs) on wide orbits (>10 au) around their host stars. striving to understand formation and evolution mechanisms, in 2015 we initiated SPHERE infrared survey for exoplanets (SHINE), a systematic young, nearby stars that is targeted at exploring demographics. Aims. We aim detect characterize population giant planets dwarfs beyond snow line Combined with completeness, our...
Abstract We present deep X-ray and radio observations of the fast blue optical transient (FBOT) AT 2020xnd/ZTF 20acigmel at z = 0.2433 from 13 days to 269 after explosion. 2020xnd belongs category optically luminous FBOTs with similarities archetypal event 2018cow. shows emission reaching L ν ≈ 8 × 10 29 erg s −1 Hz 20 GHz 75 post-explosion, accompanied by rapidly fading soft peaking X 6 42 . Interpreting in context synchrotron radiation explosion’s shock interaction environment, we find...
Measurement of the gas velocity distribution in galaxy clusters provides insight into physics mergers, through which large scale structures form Universe. Velocity estimates within intracluster medium (ICM) can be obtained via Sunyaev-Zel'dovich (SZ) effect, but its observation is challenging both term sensitivity requirement and control systematic effects, including removal contaminants. In this paper we report resolved observations, at 150 260 GHz, SZ effect toward triple merger MACS...
The direct imaging of extrasolar giant planets demands the highest possible contrasts (dH ~10 magnitudes) at smallest angular separations (~0.1'') from star. We present an adaptive optics observing method, called star-hopping, recently offered as standard queue for SPHERE instrument VLT. method uses reference difference (RDI) but unlike earlier works, obtains images a star PSF subtraction, within minutes target aim to significantly gain in contrast over conventional differencing (ADI) search...
ABSTRACT We present an extension to a Sunyaev–Zel’dovich Effect (SZE) selected cluster catalogue based on observations from the South Pole Telescope (SPT); this extends lower signal noise than previous SPT–SZ and therefore includes mass clusters. Optically derived redshifts, centres, richnesses, morphological parameters together with contamination completeness statistics are extracted using multicomponent matched filter (MCMF) algorithm applied S/N > 4 candidate list Dark Energy...
We present 90, 140, and 268GHz sub-arcminute resolution imaging of the Sunyaev-Zel'dovich effect (SZE) in MACSJ0717.5+3745. Our 90GHz SZE data result a sensitive, 34uJy/bm map at 13" using MUSTANG. 140 imaging, with resolutions 58" 31" sensitivities 1.8 3.3mJy/beam respectively, was obtained Bolocam. compare these maps to 2-dimensional pressure derived from Chandra X-ray observations. MUSTANG confirm previous indications enhancement due shock-heated, >20keV gas immediately adjacent extended...
Abstract BACKGROUND Aneurysm recurrence after coiling has been associated with aneurysm growth, (re)hemorrhage, and a greater need for follow-up. The second-generation HydroCoil Embolic System (HES; MicroVention, Inc) consists of platinum core integrated hydrogel was developed to reduce through enhancing packing density healing within the aneurysm. OBJECTIVE To compare between HES bare coil (BPC) in new-generation Hydrogel Endovascular Treatment Trial (HEAT). METHODS HEAT is randomized,...
Background and Purpose: Although most strokes present with mild symptoms, these have been poorly represented in clinical trials. The objective of this study is to describe multidimensional outcomes, identify predictors worse explore the effect thrombolysis population. Methods: This prospective observational included patients ischemic stroke or transient attack, a baseline National Institutes Health Stroke Scale (NIHSS) score 0 5, presenting within 4.5 hours from symptom onset. primary...
Context: The study of dust emission at millimeter wavelengths is important to shed light on the properties and physical structure pre-stellar cores, initial conditions in process star planet formation. Aims: Using two new continuum facilities, AzTEC LMT MUSTANG-2 GBO, we aim detect changes optical grains as a function radius for well-known core L1544. Methods: We determine profiles 1.1 3.3 mm examine whether they can be reproduced terms current best models also make use various tools radial...
Having a detailed knowledge of the intracluster medium (ICM) to infer exact cluster physics such as dynamical state is crucial for cluster-based cosmological studies. This limits accuracy and precision mass estimation, key parameter In this paper, we conduct an in-depth analysis ACT-CL J0240.0+0116 using multi-wavelength approach, with primary focus on high angular resolution Sunyaev-Zeldovich (SZ) thermal component observations obtained under NIKA2 Large Programme (LPSZ). We create...
The Cygnus-X complex is a massive (a few $10^6$,M_⊙ molecular gas mass), nearby (1.4,kpc) star-forming region with several OB associations. Of these, Cyg OB2 the largest, at least 169 stars. DR18 largest globule near association, making it perfect target for investigating influence of ultraviolet radiation on clouds. By analyzing emission from different species, we aim to study structures toward using high angular-resolution line observations. As part Cygnus Allscale Survey Chemistry and...
The Cygnus-X complex is a massive, nearby (1.4 kpc) star-forming region with several OB associations. As part of the Cygnus Allscale Survey Chemistry and Dynamical Environments (CASCADE) program, we carried out 3.6 millimeter (mm) continuum spectral line high-resolution observations ($\sim$ 3 - 4$''$) toward DR18, covering molecular species Northern Extended Millimeter Array (NOEMA) Institut de Radioastronomie Millim\'etrique (IRAM) 30m telescope. In addition, multi-wavelength archival...
ABSTRACT We report a significant detection of the hot intergalactic medium in filamentary bridge connecting galaxy clusters Abell 399 and 401. This result is enabled by low-noise, high-resolution map thermal Sunyaev–Zeldovich signal from Atacama Cosmology Telescope (ACT) Planck satellite. The ACT data provide 1.65 arcmin resolution that allows us to clearly separate profiles clusters, whose centres are separated 37 arcmin, gas associated with filament. A model fits for only two ruled out...
The precise estimation of the mass galaxy clusters is a major issue for cosmology. Large cluster surveys rely on scaling laws that relate observables to their masses. From high resolution observations ~ 45 with NIKA2 and XMM-Newton instruments, SZ Program should provide an accurate relation between thermal Sunyaev-Zel'dovich effect hydrostatic mass. In this paper, we present exhaustive analysis well known CL J1226.9+3332, highest-redshift in at z = 0.89. We combine data from NIKA, Bolocam...
ABSTRACT In this work, we study the intracluster medium (ICM) of a galaxy cluster at cosmic noon: JKCS 041 z = 1.803. A 28 h long Sunyaev-Zel’dovich (SZ) observation using MUSTANG-2 allows us to detect 041, even if intrinsically extremely faint compared other SZ-detected clusters. We found that SZ peak is offset from X-ray centre by about 220 kpc in direction brightest galaxy, which interpret as due being observed just after first passage major merger. has low central pressure and Compton Y...
The galaxy cluster Zwicky 3146 is a sloshing cool core at $z{=}0.291$ that in SZ imaging does not appear to exhibit significant pressure substructure the intracluster medium (ICM). We perform surface brightness fluctuation analysis via Fourier amplitude spectra on (MUSTANG-2) and X-ray (XMM-Newton) images of this cluster. These fluctuations can be deprojected infer density from data, respectively. In central region (Ring 1, $r < 100^{\prime\prime} = 440$ kpc, our analysis) we find suggest...
Submillimeter single-dish telescopes offer two key advantages compared to interferometers: they can efficiently map larger portions of the sky and recover spatial scales. Nonetheless, fluctuations in atmosphere limit accurate retrieval signals from astronomical sources. Therefore, we introduce a user-friendly simulator named maria optimize scanning strategies instrument designs reduce atmospheric noise filtering effects. We further use this tool produce synthetic time streams maps...
We propose a method to map the temperature distribution of hot gas in galaxy clusters that uses resolved images thermal Sunyaev-Zel'dovich (tSZ) effect combination with X-ray data. Application from New IRAM KIDs Array (NIKA) and XMM-Newton allows us measure determine spatial merging cluster MACS J0717.5+3745, at $z=0.55$. Despite complexity target object, we find good morphological agreement between maps derived spectroscopy only -- using ($T_{\rm XMM}$) Chandra CXO}$) new gas-mass-weighted...
Context . In the past decade, sensitive, resolved Sunyaev-Zel’dovich (SZ) studies of galaxy clusters have become common. Whereas many previous SZ parameterized pressure profiles clusters, non-parametric reconstructions will provide insights into thermodynamic state intracluster medium. Aim We seek to recover high redshift ( z = 0.89) cluster CLJ 1226.9+3332 as inferred from data MUSTANG, NIKA, Bolocam, and Planck instruments, which all probe different angular scales. Methods Our algorithm...
The Crab nebula is a supernova remnant exhibiting highly polarized synchrotron radiation at radio and millimetre wavelengths. It the brightest source in microwave sky with an extension of 7 by 5 arcmin, commonly used as standard candle for any experiment which aims to measure polarization sky. Though its spectral energy distribution has been well characterized total intensity, data are still lacking We report this paper high resolution observations (18′′ FWHM ) intensity linear 150 GHz NIKA...
The characterization of dust properties in the interstellar medium (ISM) is key for star formation. Mass estimates are crucial to determine gravitational collapse conditions birth new stellar objects molecular clouds. However, most these rely on models that need further observational constraints from clouds prestellar and protostellar cores. We present results a study emissivity changes based mm-continuum data obtained with NIKA camera at IRAM-30m telescope. Observing emission 1.15 mm 2...
The determination of the thermodynamic properties clusters galaxies at intermediate and high redshift can bring new insights into formation large-scale structures. It is essential for a robust calibration mass-observable scaling relations their scatter, which are key ingredients precise cosmology using cluster statistics. Here we illustrate an application resolution $(< 20$ arcsec) thermal Sunyaev-Zel'dovich (tSZ) observations by probing intracluster medium (ICM) \planck-discovered galaxy...