A5029303025- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Optical Systems and Laser Technology
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Nuclear reactor physics and engineering
- Advanced Optical Sensing Technologies
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Nuclear Engineering Thermal-Hydraulics
- CCD and CMOS Imaging Sensors
- Environmental Monitoring and Data Management
- Material Properties and Processing
University of South Carolina
2015-2024
Johns Hopkins University
2010-2016
University of Hawaii System
2005-2009
Case Western Reserve University
2002
We present optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey. detail improvements to PS1 SN photometry, astrometry calibration that reduce systematic uncertainties in distances. combine subset of 279 ($0.03 < z 0.68$) with useful distance estimates from SDSS, SNLS, various low-z HST samples form largest combined sample consisting a total 1048 ranging $0.01 2.3$, which we...
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on Hubble Space Telescope, from mid-ultraviolet near-infrared, and find measure Type Ia supernovae at z>1.5 test their accuracy as standardizable candles for cosmology. Five premier multi-wavelength sky regions are selected, each with...
This paper describes the Hubble Space Telescope imaging data products and reduction procedures for Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). survey is designed to document evolution of galaxies black holes at $z\sim1.5-8$, study Type Ia SNe beyond $z>1.5$. Five premier multi-wavelength sky regions are selected, each with extensive multiwavelength observations. The primary CANDELS consist obtained in Wide Field Camera 3 / infrared channel (WFC3/IR) UVIS channel,...
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit multi-cycle treasury program to use the gravitational lensing properties of 25 galaxy clusters accurately constrain their mass distributions. survey, described in detail this paper, will definitively establish degree concentration dark matter cluster cores, key prediction CDM. CLASH sample larger and less biased than current samples space-based imaging studies similar depth, as we have minimized lensing-based...
We present a candidate for the most distant galaxy known to date with photometric redshift of z = 10.7+0.6−0.4 (95% confidence limits; < 9.5 galaxies types ruled out at 7.2σ). This J-dropout Lyman break galaxy, named MACS0647-JD, was discovered as part Cluster Lensing and Supernova survey Hubble (CLASH). observe three magnified images this due strong gravitational lensing by cluster MACSJ0647.7+7015 0.591. The are factors ∼80, 7, 2, brighter two observed ∼26th magnitude AB (∼0.15 μJy) in...
In 1964, Refsdal hypothesized that a supernova whose light traversed multiple paths around strong gravitational lens could be used to measure the rate of cosmic expansion. We report discovery such system. Hubble Space Telescope imaging, we have found four images single forming an Einstein cross configuration redshift z=0.54 elliptical galaxy in MACS J1149.6+2223 cluster. The cluster's potential also creates z=1.49 spiral host galaxy, and future appearance elsewhere cluster field is expected....
We present griz light curves of 146 spectroscopically confirmed Type Ia Supernovae ($0.03 < z <0.65$) discovered during the first 1.5 years Pan-STARRS1 Medium Deep Survey. The natural photometric system is determined by a combination on-site measurements instrument response function and observations spectrophotometric standard stars. find that systematic uncertainties in are currently 1.2\% without accounting for uncertainty HST Calspec definition AB system. A Hubble diagram constructed with...
We present an analysis of 15 Type Ia supernovae (SNe Ia) at redshift z > 1 (9 1.5 < 2.3) recently discovered in the CANDELS and CLASH Multi-Cycle Treasury programs using WFC3 on Hubble Space Telescope. combine these SNe with a new compilation 1050 Ia, jointly calibrated corrected for simulated survey biases to produce accurate distance measurements. unbiased constraints expansion rate six redshifts range 0.07 based only this combined SN sample. The added leverage our sample leads factor ~3...
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...
The gravitationally lensed supernova Refsdal appeared in multiple images produced through gravitational lensing by a massive foreground galaxy cluster. After the 2014, lens models of cluster predicted that an additional image would appear 2015, which was subsequently observed. We use time delays between to perform blinded measurement expansion rate Universe, quantified Hubble constant (
We present the discovery of two ultra-luminous supernovae (SNe) at z ~ 0.9 with Pan-STARRS1 Medium-Deep Survey. These SNe, PS1-10ky and PS1-10awh, are amongst most luminous SNe ever discovered, comparable to unusual transients SN 2005ap SCP 06F6. Like 06F6, they show characteristic high luminosities (M_bol -22.5 mag), blue spectra a few broad absorption lines, no evidence for H or He. have constructed full multi-color light curve sensitive peak spectral energy distribution in rest-frame...
We identify an abundant population of extreme emission-line galaxies (EELGs) at redshift z ∼ 1.7 in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey imaging from Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3). Sixty-nine EELG candidates are selected by large contribution exceptionally bright emission lines to their near-infrared broadband magnitudes. Supported spectroscopic confirmation strong [O iii] lines—with rest-frame equivalent widths ∼1000 Å—in four that have...
We report results from the Supernova Photometric Classification Challenge (SNPCC), a publicly released mix of simulated supernovae (SNe), with types (Ia, Ibc, and II) selected in proportion to their expected rate. The simulation was realized griz filters Dark Energy Survey (DES) realistic observing conditions (sky noise, point-spread function atmospheric transparency) based on years recorded at DES site. Simulations non-Ia type SNe are spectroscopically confirmed light curves that include...
We precisely constrain the inner mass profile of Abell 2261 (z=0.225) for first time and determine this cluster is not "over-concentrated" as found previously, implying a formation in agreement with ΛCDM expectations. These results are based on strong lensing analyses new 16-band HST imaging obtained part Cluster Lensing Supernova survey Hubble (CLASH). Combining revised weak Subaru wide field 5-band + KPNO photometry, we place tight constraints halo virial M_vir = 2.2\pm0.2\times10^15...
We present a high-precision mass model of galaxy cluster Abell 2744, based on strong gravitational-lensing analysis the Hubble Space Telescope Frontier Fields (HFF) imaging data, which now include both Advanced Camera for Surveys and Wide Field 3 observations to final depth. Taking advantage unprecedented depth visible near-infrared we identify 34 new multiply imaged galaxies, bringing total 61, comprising 181 individual lensed images. In process, correct previous erroneous identifications...
We probe the systematic uncertainties from 113 Type Ia supernovae (SNIa) in Pan-STARRS1 (PS1) sample along with 197 SN a combination of low-redshift surveys. The companion paper by Rest et al. (2013) describes photometric measurements and cosmological inferences PS1 sample. largest uncertainty stems calibration low-z samples. increase observed Calspec standards 7 to 10 used define system. SDSS-II systems are compared discrepancies up ~0.02 mag recovered. find proper way treat intrinsic...
We present the supernova (SN) sample and Type-Ia SN (SN Ia) rates from Cluster Lensing And Supernova survey with Hubble (CLASH). Using Advanced Camera for Surveys Wide Field 3 on Space Telescope (HST), we have imaged 25 galaxy-cluster fields parallel of non-cluster galaxies. report a 27 SNe discovered in fields. Of these SNe, ∼13 are classified as Ia candidates, including four candidates at redshifts z > 1.2. measure volumetric to redshift 1.8 add first upper limit rate range < 2.4. The...
The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) was a multi-cycle treasury program on the Hubble Space Telescope (HST) that surveyed total area of ~0.25 deg^2 with ~900 HST orbits spread across 5 fields over 3 years. Within these survey images we discovered 65 supernovae (SN) all types, out to z~2.5. We classify ~24 as Type Ia SN (SN Ia) based host-galaxy redshifts and photometry (supplemented by grism spectroscopy 6 SN). Here present measurement volumetric rate...
Realizing Refsdal's original idea from 1964, we present estimates of the Hubble constant that are complementary to and potentially competitive with those other cosmological probes. We use observed positions 89 multiple images, extensive spectroscopic information, 28 background sources measured time delays between images S1-S4 SX supernova "Refsdal" ($z = 1.489$), which were obtained thanks Space Telescope (HST) deep imaging Multi Unit Spectroscopic Explorer (MUSE) data. extend strong lensing...
A spectral-energy distribution (SED) model for Type Ia supernovae (SNe Ia) is a critical tool measuring precise and accurate distances across large redshift range constraining cosmological parameters. We present an improved framework, SALT3, which has several advantages over current models including the leading SALT2 (SALT2.4). While SALT3 similar philosophy, it differs from by having estimation of uncertainties, better separation color light-curve stretch, publicly available training code....
Abstract Massive foreground galaxy clusters magnify and distort the light of objects behind them, permitting a view into both extremely distant intrinsically faint populations. We present here candidate high-redshift galaxies from Reionization Lensing Cluster Survey (RELICS), Hubble Spitzer Space Telescope survey 41 massive spanning an area ≈200 arcmin 2 . These were selected to be excellent lenses, we find similar sample sizes magnitude distributions as And Supernova with (CLASH). discover...
The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + parallel Cycle 25 Hubble Space Telescope Treasury program taking data from 2018-2020. BUFFALO will expand existing coverage of the (HFF) in WFC3/IR F105W, F125W, F160W ACS/WFC F606W F814W around each six HFF clusters flanking fields. This additional area has not been observed by HST but already covered deep multi-wavelength datasets, including Spitzer Chandra. As with original program, designed to take...