James Bosch
A5049050717- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Scientific Computing and Data Management
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Distributed and Parallel Computing Systems
- Advanced Data Storage Technologies
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Environmental Monitoring and Data Management
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Advanced Image Processing Techniques
- Optical measurement and interference techniques
- Advanced Vision and Imaging
- Real-time simulation and control systems
- Sparse and Compressive Sensing Techniques
- Blind Source Separation Techniques
- Infrastructure Maintenance and Monitoring
- Medical Image Segmentation Techniques
Princeton University
2014-2024
Vera C. Rubin Observatory
2024
Large Synoptic Survey Telescope Corporation
2015
University of California, Davis
2008-2010
(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...
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of 8.2m Subaru telescope summit Maunakea in Hawaii. A team scientists from Japan, Taiwan and Princeton University using HSC to carry out 300-night multi-band survey high-latitude sky. The includes three layers: Wide layer will cover 1400 deg$^2$ five broad bands ($grizy$), with $5\,\sigma$ point-source depth $r \approx 26$. Deep covers total 26~deg$^2$ four fields, going roughly magnitude fainter, while UltraDeep goes...
Abstract We measure cosmic weak lensing shear power spectra with the Subaru Hyper Suprime-Cam (HSC) survey first-year catalog covering 137 deg2 of sky. Thanks to high effective galaxy number density ∼17 arcmin−2, even after conservative cuts such as a magnitude cut i < 24.5 and photometric redshift 0.3 ≤ z 1.5, we obtain high-significance measurement in four tomographic bins, achieving total signal-to-noise ratio 16 multipole range 300 ℓ 1900. carefully account for various...
In this paper, we describe the optical imaging data processing pipeline developed for Subaru Telescope's Hyper Suprime-Cam (HSC) instrument. The HSC Pipeline builds on prototype being by Large Synoptic Survey Data Management system, adding customizations HSC, large-scale capabilities, and novel algorithms that have since been reincorporated into LSST codebase. While designed primarily to reduce Strategic Program (SSP) data, it is also recommended reducing general-observer data. includes high...
Abstract The Hyper Suprime-Cam (HSC) is an 870 megapixel prime focus optical imaging camera for the 8.2 m Subaru telescope. wide-field corrector delivers sharp images of 0${^{\prime\prime}_{.}}$2 (FWHM) in HSC-i band over entire 1${^{\circ}_{.}}$5 diameter field view. collimation with respect to axis primary mirror done hexapod actuators, mechanical accuracy which a few microns. Analysis remaining wavefront error off-focus stellar reveals that components meets design specifications. While...
This paper presents the second data release of Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey on 8.2 meter Telescope. The includes from 174 nights observation through January 2018. Wide layer cover about 300 deg^2 in all five broadband filters (grizy) to nominal exposure (10min gr and 20min izy). Partially observed areas are also included release; 1100 is at least one filter exposure. median seeing i-band 0.6 arcsec, demonstrating superb image quality survey....
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most outstanding questions in astronomy today, including nature dark matter and energy. has been awarded 300 nights observing time Telescope it started March 2014. This paper presents first public data release HSC-SSP. includes taken 1.7 years observations (61.5 nights) each Wide, Deep, UltraDeep layers covers about 108, 26, 4 square degrees down to depths i~26.4, ~26.5,...
Abstract We present measurements of cosmic shear two-point correlation functions (TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC) first-year data, and derive cosmological constraints based on a blind analysis. The HSC shape catalog is divided into four tomographic redshift bins ranging $z=0.3$ to 1.5 with equal widths $\Delta z =0.3$. unweighted galaxy number densities in each bin are 5.9, 4.3, $2.4\:$arcmin$^{-2}$ the lowest highest redshifts, respectively. adopt standard TPCF...
Abstract This paper presents the third data release of Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP), a wide-field multi-band imaging survey with 8.2 m telescope. HSC-SSP has three layers (Wide, Deep, and UltraDeep) different area coverages depths, designed to address wide array astrophysical questions. from includes 278 nights observing time covers about 670 deg2 in all five broad-band filters (grizy) at full depth (∼26 mag 5σ depending on filter) Wide layer. If we include partially...
Abstract We have developed an automated quick data analysis system for quality assurance (QA) Hyper Suprime-Cam (HSC). The was commissioned in 2012–2014, and has been offered general observations, including the HSC Subaru Strategic Program, since 2014 March. provides observers with information, such as seeing, sky background level, transparency, based on are acquired. Quick-look images validation of image focus also provided through interactive web application. is responsible automatic...
ABSTRACT We report the discovery of 15 quasars and bright galaxies at 5.7 < z 6.9. This is initial result from Subaru High- Exploration Low-Luminosity Quasars project, which exploits exquisite multiband imaging data produced by Hyper Suprime-Cam (HSC) Strategic Program survey. The candidate selection performed combining several photometric approaches including a Bayesian probabilistic algorithm to reject stars dwarfs. spectroscopic identification was carried out with Gran Telescopio...
We measure weak lensing cosmic shear power spectra from the 3-year galaxy catalog of Hyper Suprime-Cam (HSC) Subaru Strategic Program imaging survey. The covers 416 deg2 northern sky, with a mean i-band seeing 0.59 arcsec and an effective number density 15 arcmin−2 within our adopted redshift range. With magnitude limit 24.5 mag, four tomographic bins spanning 0.3≤zph≤1.5 based on photometric redshifts, we obtain high-significance measurement spectra, signal-to-noise ratio approximately 26.4...
We perform a blinded cosmology analysis with cosmic shear two-point correlation functions measured from more than 25 million galaxies in the Hyper Suprime-Cam three-year catalog four tomographic redshift bins ranging 0.3 to 1.5. After conservative masking and galaxy selection, survey covers 416 deg2 of northern sky an effective number density 15 arcmin−2 over bins. The 2PCFs adopted for are angular range; 7.1<θ/arcmin<56.6 ξ+ 31.2<θ/arcmin<248 ξ−, total signal-to-noise ratio 26.6. apply...
We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, in a sequence of challenges for testing methods inferring weak gravitational lensing shear distortions simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included space- ground-based data with constant or cosmologically varying fields. The simplest (control) experiment parametric galaxies realistic distribution signal-to-noise, size, ellipticity,...
We present results from a set of simulations designed to constrain the weak lensing shear calibration for Hyper Suprime-Cam (HSC) survey. These include HSC observing conditions and galaxy images Hubble Space Telescope (HST), with fully realistic morphologies impact nearby galaxies included. find that inclusion in is critical reproducing observed distributions sizes magnitudes, due non-negligible fraction unrecognized blends ground-based data, even excellent typical seeing survey (0.58"...
The Large Synoptic Survey Telescope (LSST) is a large-aperture, wide-field, ground-based survey system that will image the sky in six optical bands from 320 to 1050 nm, uniformly covering approximately $18,000$deg$^2$ of over 800 times. LSST currently under construction on Cerro Pachón Chile, and expected enter operations 2022. Once operational, explore wide range astrophysical questions, discovering "killer" asteroids examining nature Dark Energy. generate average 15 TB data per night,...
Abstract We present and characterize the catalog of galaxy shape measurements that will be used for cosmological weak lensing in Wide layer first year Hyper Suprime-Cam (HSC) survey. The covers an area 136.9 deg2 split into six fields, with a mean i-band seeing 0${^{\prime\prime}_{.}}$58 5σ point-source depth i ∼ 26. Given conservative selection criteria first-year science, excellent image quality results unweighted weighted source number densities 24.6 21.8 arcmin−2, respectively. define...
The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with goal testing and facilitating development methods for analyzing astronomical images that will be used to measure weak gravitational lensing. This measurement requires extremely precise estimation very small galaxy shape distortions, presence far larger intrinsic shapes distortions due blurring kernel caused by atmosphere, telescope optics, instrumental effects. GREAT3...
Abstract We present the procedure to build and validate bright-star masks for Hyper-Suprime-Cam Strategic Subaru Proposal (HSC-SSP) survey. To identify mask saturated stars in full HSC-SSP footprint, we rely on Gaia Tycho-2 star catalogues. first assemble a pure catalogue down GGaia &lt; 18 after removing ∼1.5% of sources that appear extended Sloan Digital Sky Survey (SDSS). perform visual inspection early data from S16A internal release HSC-SSP, finding our is 99.2% 18. Second, regions...
We report discovery of 41 new high-z quasars and luminous galaxies, which were spectroscopically identified at 5.7 < z 6.9. This is the fourth in a series papers from Subaru High-z Exploration Low-Luminosity Quasars (SHELLQs) project, based on deep multi-band imaging data collected by Hyper Suprime-Cam (HSC) Strategic Program survey. selected photometric candidates Bayesian probabilistic algorithm, then carried out follow-up spectroscopy with Gran Telescopio Canarias Telescope. Combined...
The Subaru Strategic Program (SSP) is an ambitious multi-band survey using the Hyper Suprime-Cam (HSC) on telescope. Wide layer of SSP both wide and deep, reaching a detection limit i~26.0 mag. At these depths, it challenging to achieve accurate, unbiased, consistent photometry across all five bands. HSC data are reduced pipeline that builds prototype for Large Synoptic Survey Telescope. We have developed Python-based, flexible framework inject synthetic galaxies into real images called...
Abstract We report the discovery of 28 quasars and 7 luminous galaxies at 5.7 ≤ z 7.0. This is tenth in a series papers from Subaru High- Exploration Low-Luminosity Quasars (SHELLQs) project, which exploits deep multiband imaging data produced by Hyper Suprime-Cam (HSC) Strategic Program survey. The total number spectroscopically identified objects SHELLQs has now grown to 93 high- quasars, 31 galaxies, 16 [O iii ] emitters ∼ 0.8, 65 Galactic cool dwarfs (low-mass stars brown dwarfs). These...
Abstract We present the spectroscopic discovery of 69 quasars at 5.8 < z 7.0, drawn from Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) imaging survey data. This is 16th publication High- Exploration Low-Luminosity Quasars (SHELLQs) project, and it completes identification all but faintest candidates (i.e., i -band dropouts with AB 24 y detections, 24) Bayesian quasar probability <?CDATA ${P}_{Q}^{B}\gt 0.1$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We present cosmological parameter constraints from a blind joint analysis of three two-point correlation functions measured the Year 3 Hyper Suprime-Cam (HSC-Y3) imaging data, covering about 416 deg2, and SDSS DR11 spectroscopic galaxies spanning redshift range [0.15, 0.70]. subdivide into luminosity-cut, therefore nearly volume-limited samples separated in redshift, each which acts as large-scale structure tracer characterized by measurement projected function, wp(R). also use measurements...