Jason Rhodes
A5073336924- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Aerospace Engineering and Energy Systems
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
- Infrared Target Detection Methodologies
- Photocathodes and Microchannel Plates
- Atmospheric Ozone and Climate
- Remote Sensing in Agriculture
Jet Propulsion Laboratory
2016-2025
Australian Astronomical Observatory
2018-2024
Macquarie University
2024
The University of Queensland
2024
University of Zurich
2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2023
University College London
2011-2022
California Institute of Technology
2012-2021
Kavli Institute for the Physics and Mathematics of the Universe
2015-2021
The University of Tokyo
2015-2021
We present Advanced Camera for Surveys, NICMOS, and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey. The SNe were discovered over redshift interval 0.623 < z 1.415. Of these Ia, 14 pass our strict selection cuts are used in combination with world's sample to derive best current constraints on dark energy. new 10 beyond = 1, thereby nearly doubling statistical weight HST-discovered this redshift. Our...
This report describes the 2014 study by Science Definition Team (SDT) of Wide-Field Infrared Survey Telescope (WFIRST) mission. It is a space observatory that will address most compelling scientific problems in dark energy, exoplanets and general astrophysics using 2.4-m telescope with wide-field infrared instrument an optical coronagraph. The Astro2010 Decadal recommended Wide Field as its top priority for new large As conceived decadal survey, WFIRST would carry out energy science program,...
We present imaging data and photometry for the COSMOS survey in 15 photometric bands between 0.3 2.4 μm. These include taken on Subaru 8.3 m telescope, KPNO CTIO 4 telescopes, CFHT 3.6 telescope. Special techniques are used to ensure that relative calibration is better than 1% across field of view. The absolute accuracy from standard-star measurements found be 6%. corrected using galaxy spectra, providing colors accurate 2% or better. Stellar counts agree well with expected values. Finally,...
We describe the details of Hubble Space Telescope (HST) Advanced Camera for Surveys / Wide Field Channel (ACS/WFC) observations COSMOS field, including data calibration and processing procedures. obtained a total 583 orbits HST ACS/WFC imaging in F814W filter, covering field that is 1.64 square degrees area, largest contiguous ever imaged with HST. The median exposure depth across 2028 seconds (one orbit), achieving limiting point-source AB(F814W) = 27.2 (5 sigma). also present about...
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high resolution imaging. Here we review characteristics of HST imaging Advanced Camera Surveys (ACS) and parallel observations NICMOS WFPC2. A square field (1.8$\sq$\deg) has been imaged single-orbit ACS I-F814W exposures 50% completeness sources 0.5\arcsec diameter at I$_{AB} $ = 26.0 mag. is a key part COSMOS survey, providing very...
The Shear TEsting Programme, STEP, is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for next generation wide-field surveys. In this first STEP paper we present results blind analysis simulated ground-based observations relatively simple galaxy morphologies. most successful methods are shown achieve percent level accuracy. From cosmic shear pipelines that have been used constrain cosmology, find measured an within statistical...
We present a weak gravitational lensing analysis of 22 early-type strong lens galaxies, based on deep HST images obtained as part the Sloan Lens ACS Survey. Using most advanced techniques to control systematic uncertainties related variable PSF and charge transfer efficiency ACS, we detect signal out 300 kpc/h. analyze blank fields from COSMOS survey in same manner, inferring that residual uncertainty tangential shear is <0.3%. A joint shows average total mass density profile consistent with...
Using data from the COSMOS survey, we perform first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and number densities. Carefully accounting for sample variance scatter between stellar halo mass, model all three observables simultaneously using a novel self-consistent theoretical framework. Our results provide strong constraints on shape redshift evolution stellar-to-halo mass relation (SHMR) z=0.2 to z=1. At low find that scales as Mh M*^0.46 this scaling does not...
With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged largest contiguous area observed by Hubble Space Telescope (HST) to date using Advanced Camera for Surveys (ACS). This is first paper in series where we describe our strategy addressing various technical challenges production data. The ACS catalog constructed 575 ACS/WFC tiles (1.64 deg^2) and contains total 1.2x10^6 objects limiting magnitude F814W=26.5. made publicly available....
ABSTRACT We investigate if the discrepancy between estimates of total baryon mass fraction obtained from observations cosmic microwave background (CMB) and galaxy groups/clusters persists when a large sample groups is considered. To this purpose, 91 candidate X-ray groups/poor clusters at redshift 0.1 ⩽ z 1 are selected COSMOS 2 deg survey, based only on their luminosity extent. This complemented by 27 nearby with robust, analogous determination stellar inside R 500 . The 118 spans range in...
We present a detailed strong-lensing, weak-lensing and X-ray analysis of Abell 2744 (z= 0.308), one the most actively merging galaxy clusters known. It appears to have unleashed 'dark', 'ghost', 'bullet' 'stripped' substructures, each ∼1014 M⊙. The phenomenology is complex will challenge for numerical simulations reproduce. With new, multiband Hubble Space Telescope (HST) imaging, we identify 34 strongly lensed images 11 galaxies around massive Southern 'core'. Combining this with data from...
The Wide Field Infrared Survey Telescope (WFIRST) is a 2.4m space telescope with 0.281 deg^2 field of view for near-IR imaging and slitless spectroscopy coronagraph designed > 10^8 starlight suppresion. As background information Astro2020 white papers, this article summarizes the current design anticipated performance WFIRST. While WFIRST does not have UV imaging/spectroscopic capabilities Hubble Space Telescope, wide surveys hundreds times more efficient. Some most ambitious multi-cycle...
Abstract We present the survey design, implementation, and outlook for COSMOS-Web, a 255 hr treasury program conducted by James Webb Space Telescope in its first cycle of observations. COSMOS-Web is contiguous 0.54 deg 2 NIRCam imaging four filters (F115W, F150W, F277W, F444W) that will reach 5 σ point-source depths ranging ∼27.5–28.2 mag. In parallel, we obtain 0.19 MIRI one filter (F770W) reaching ∼25.3–26.0 build on rich heritage multiwavelength observations data products available COSMOS...
Abstract We report the discovery of 15 exceptionally luminous 10 ≲ z 14 candidate galaxies discovered in first 0.28 deg 2 JWST/NIRCam imaging from COSMOS-Web survey. These sources span rest-frame UV magnitudes −20.5 > M −22, and thus constitute most intrinsically ≳ candidates identified by JWST to date. Selected via NIRCam imaging, deep ground-based observations corroborate their detection help significantly constrain photometric redshifts. analyze spectral energy distributions using...
Abstract We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin 2 of publicly available Cycle 1 data from COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) detection MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 CEERS-z7M1, that have best-fit photometric redshifts <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi>...
The Euclid ERO showcase Euclid's capabilities in advance of its main mission by targeting 17 astronomical objects, including galaxy clusters, nearby galaxies, globular and star-forming regions. A total 24 hours observing time was allocated the early months operation, scientific community engaged through an public data release. We describe development pipeline to create visually compelling images while simultaneously meeting demands within launch leveraging a pragmatic data-driven strategy....
Abstract Our knowledge of relations between supermassive black holes and their host galaxies at z ≳ 1 is still limited, even though being actively sought out to ∼ 6. Here, we use the high resolution sensitivity JWST measure galaxy properties for 107 X-ray-selected type-I active galactic nuclei (AGNs) 0.68 < 2.5 with rest-frame optical/near-infrared imaging from COSMOS-Web PRIMER. Black hole masses ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Abstract We study of the role galaxy–galaxy interactions and disk instabilities in producing starburst activity galaxies out to z = 4. For this, we use a sample 387 with robust total star formation rate measurements from Herschel, gas masses Atacama Large Millimeter/submillimeter Array, stellar redshifts multiband photometry, JWST/NIRCam rest-frame optical imaging. Using mass-controlled samples, find an increased fraction interacting regime at all This increase correlates efficiency (SFE)...
The Shear TEsting Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak lensing measurement, in preparation for next generation wide-field surveys. We review sixteen current emerging shear measurement methods common language, assess their performance by running them (blindly) on simulated images that contain known signal. determine features algorithms most successfully recover input parameters. achieve previously unattained discriminatory precision our...
Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and understanding physical processes that govern heating cooling intracluster medium. In this paper, we use a sample 206 selected galaxy groups to investigate relation between luminosity (Lx) (M00) where M200 is via stacked weak gravitational lensing. This work draws upon broad array multi-wavelength COSMOS observations including 1.64 square degrees contiguous imaging...
We present a three-dimensional cosmic shear analysis of the Hubble Space Telescope COSMOS survey, largest ever optical imaging program performed in space. have measured shapes galaxies for telltale distortions caused by weak gravitational lensing and traced growth that signal as function redshift. Using both 2D 3D analyses, we measure cosmological parameters Ωm, density matter universe, σ8, normalization power spectrum. The introduction redshift information tightens constraints factor 3 also...
Motivated by the desire to reliably and automatically classify structure of thousands COSMOS galaxies, we present ZEST, Zurich Estimator Structural Types. To galaxy structure, ZEST uses (1) five nonparametric diagnostics: asymmetry, concentration, Gini coefficient, second-order moment brightest 20% pixels, ellipticity; (2) exponent n single-Sérsic fits two-dimensional surface brightness distributions. fully exploit wealth information while reducing redundancy in these diagnostics, performs a...
We use HST/ACS images and a photometric catalog of the COSMOS field to analyze morphologies host galaxies approximately 400 AGN candidates at redshifts 0.3 < z 1.0. compare hosts with sample non-active drawn from match magnitude redshift distribution hosts. perform 2-D surface brightness modeling GALFIT yield galaxy nuclear point source magnitudes. X-ray selected span substantial range that peaks between those early-type, bulge-dominated late-type, disk-dominated systems. also measure...