James G. Bartlett
A5104992999- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Relativity and Gravitational Theory
- Superconducting and THz Device Technology
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Advanced Mathematical Theories and Applications
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Space Science and Extraterrestrial Life
- Astro and Planetary Science
- Historical Geography and Cartography
- Optics and Image Analysis
- Electromagnetic Compatibility and Measurements
- Microwave Engineering and Waveguides
Université Paris Cité
2014-2024
Laboratoire AstroParticule et Cosmologie
2004-2024
ASL Environmental Sciences (Canada)
2017-2024
Centre National de la Recherche Scientifique
2012-2022
Jet Propulsion Laboratory
2012-2022
Institut National de Physique Nucléaire et de Physique des Particules
2021-2022
Sorbonne Paris Cité
2012-2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2008-2019
California Institute of Technology
2013-2019
Agence Parisienne du Climat
2019
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of exciting science opportunities next decade. The Large Synoptic Survey Telescope (LSST) have an effective aperture 6.7 meters and imaging camera field view 9.6 deg^2, be devoted ten-year 20,000 deg^2 south +15 deg. Each pointing imaged 2000 times fifteen second exposures six broad from 0.35 1.1 microns, total point-source depth r~27.5. LSST Science Book describes basic...
We present the science case, reference design, and project plan for Stage-4 ground-based cosmic microwave background experiment CMB-S4.
This book lays out the scientific goals to be addressed by next-generation ground-based cosmic microwave background experiment, CMB-S4, envisioned consist of dedicated telescopes at South Pole, high Chilean Atacama plateau and possibly a northern hemisphere site, all equipped with new superconducting cameras. CMB-S4 will dramatically advance cosmological studies crossing critical thresholds in search for B-mode polarization signature primordial gravitational waves, determination number...
Abstract CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding origin evolution universe. Among science cases pursued with CMB-S4, quest for detecting primordial gravitational waves is a central driver experimental design. This work details development forecasting framework that includes power-spectrum-based semianalytic projection tool, targeted explicitly toward...
We apply detailed observations of the color–magnitude relation (CMR) with Advanced Camera for Surveys on Hubble Space Telescope to study galaxy evolution in eight clusters at z≈ 1. The early-type red sequence is well defined and elliptical lenticular galaxies lie similar CMRs. analyze CMR parameters—scatter, slope, zero point—as a function redshift, properties cluster mass. For bright (MB < −21 mag), scatter population cores smaller than that S0 population, although two become faint...
The Probe of Inflation and Cosmic Origins (PICO) is a proposed probe-scale space mission consisting an imaging polarimeter operating in frequency bands between 20 800 GHz. We describe the science achievable by PICO, which has sensitivity equivalent to more than 3300 Planck missions, technical implementation, schedule cost.
We compare the Planck Sunyaev–Zeldovich (SZ) cluster sample (PSZ1) to Sloan Digital Sky Survey (SDSS) redMaPPer catalogue, finding that all clusters within mask and redshift range probed by are contained in catalogue. These common define a tight scaling relation richness-SZ mass (λ–MSZ) plane, with an intrinsic scatter richness of |$\sigma _{\lambda |M_{{\rm SZ}}} = 0.266 \pm 0.017$|. The corresponding true halo at fixed is ≈21 per cent. regularity this used identify failures both...
Far-infrared astronomy has advanced rapidly since its inception in the late 1950's, driven by a maturing technology base and an expanding community of researchers. This advancement shown that observations at far-infrared wavelengths are important nearly all areas astrophysics, from search for habitable planets origin life, to earliest stages galaxy assembly first few hundred million years cosmic history. The combination still developing portfolio technologies, particularly field detectors,...
The Probe of Inflation and Cosmic Origins (PICO) is an imaging polarimeter that will scan the sky for 5 years in 21 frequency bands spread between 799 GHz. It produce full-sky surveys intensity polarization with a final combined-map noise level 0.87 $\mu$K arcmin required specifications, equivalent to 3300 Planck missions, our current best-estimate would have 0.61 (6400 missions). PICO either determine energy scale inflation by detecting tensor scalar ratio at $r=5\times 10^{-4}~(5\sigma)$,...
Abstract This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its...
We look for signatures of the Hu-Sawicki f(R) modified gravity theory, proposed to explain observed accelerated expansion universe; in observations galaxy distribution, cosmic microwave background (CMB), and gravitational lensing CMB. study constraints obtained by using only CMB primary anisotropies, before adding power spectrum its cross-correlation with lensing. show that distribution measurements is crucial breaking parameter degeneracies, placing tighter on model. In particular, we set a...
We examine systematic differences in the derived X-ray properties of galaxy clusters as reported by three different groups: Vikhlinin et al. (2009a), Mantz (2010b), and Planck Collaboration (2011b). The sample overlap between any two pairs works ranges 16 to 28 common. find most properties, including total cluster mass, M500. extreme case is an average 45% \pm 5% difference mass (2011b) for at z > 0.13 (averaged over clusters). These induce observables defined within R500 aperture. After...
view Abstract Citations (71) References (35) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Sunyaev-Zel'dovich Effect and Cluster Evolution Bartlett, James G. ; Silk, Joseph We discuss methods of using the effect for studying galaxy cluster evolution formation large-scale structure in a flat universe. consider density perturbation spectra P(k) is proportional to k^n^ n = - 1, normalized both COBE data X-ray temperature distribution, 2, function. Using...
We present 279 galaxy cluster candidates at z > 1.3 selected from the 94 deg2 Spitzer South Pole Telescope Deep Field (SSDF) survey. use a simple algorithm to select candidate high-redshift clusters of galaxies based on Spitzer/IRAC mid-infrared data combined with shallow all-sky optical data. identify distant adopting an overdensity threshold that results in high purity (80%) sample tests Deep, Wide-Field Survey Boötes field. Our detects all three 1.4 < ⩽ 1.75 X-ray detected The uniqueness...
view Abstract Citations (80) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Galaxy Clusters and the COBE Result Bartlett, James G. ; Silk, Joseph The galaxy cluster temperature distribution function is calculated for several primordial power spectra, normalized to amplitude of cosmic microwave background fluctuations. Using Press-Schechter theory, we confirm that standard cold dark matter model overproduces abundance X-ray clusters with this...
Although recent determinations of the distance to Virgo cluster based on Cepheid variable stars represent an important step in pinning down Hubble constant, after 65 years a definitive determination constant still eludes cosmologists. At present, most observational place between 40 and 90 kilometers per second megaparsec (km s(-1) Mpc(-1)). The case is made here for that even smaller than lower bound accepted range basis great advantages, all theoretical nature, around 30 megaparsec. Such...
view Abstract Citations (57) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Did the Universe Recombine? Bartlett, James G. ; Stebbins, Albert The Zel'dovich-Sunyaev model-independent arguments for existence of a neutral hydrogen phase is reviewed in light new limits on Compton y parameter from COBE. It concluded that with baryon densities compatible standard cosmological nucleosynthesis, universe could have remained fully ionized throughout...
Abstract This Science White Paper, prepared in response to the ESA Voyage 2050 call for long-term mission planning, aims describe various science possibilities that can be realized with an L-class space observatory is dedicated study of interactions cosmic microwave background (CMB) photons web. Our aim specifically use CMB as a backlight – and survey gas, total mass, stellar content entire observable Universe by means analyzing spatial spectral distortions imprinted on it. These result from...
This paper discusses the science case for a sensitive spectro-polarimetric survey of microwave sky. Such would provide tomographic and dynamic census three-dimensional distribution hot gas, velocity flows, early metals, dust, mass in entire Hubble volume, exploit CMB temperature polarisation anisotropies down to fundamental limits, track energy injection absorption into radiation background across cosmic times by measuring spectral distortions blackbody emission. In addition its exceptional...
ATLAS (Astrophysics Telescope for Large Area Spectroscopy) Probe is a concept NASA probe-class space mission. It the follow-up mission to WFIRST, boosting its scientific return by obtaining deep IR slit spectroscopy 70% of all galaxies imaged 2000 sq deg WFIRST High Latitude Survey at z>0.5. will measure accurate and precise redshifts 200M out z < 7, deliver spectra that enable wide range diagnostic studies physical properties over most cosmic history. science spans four broad categories:...
Abstract The thermal Sunyaev–Zel’dovich (tSZ) effect is a powerful tool with the potential for constraining directly properties of hot gas that dominates dark matter halos because it measures pressure and thus energy density. Studying this component circumgalactic medium (CGM) important strongly impacted by star formation active galactic nucleus (AGN) activity in galaxies, participating feedback loop regulates black hole mass growth galaxies. We study tSZ across wide halo-mass range using...
We measure the far-infrared emission of general quasar (QSO) population using Planck observations Baryon Oscillation Spectroscopic Survey QSO sample. By applying multi-component matched multi-filters to seven highest frequencies, we extract amplitudes dust, synchrotron and thermal Sunyaev-Zeldovich (SZ) signals for nearly 300,000 QSOs over redshift range $0.1