Adam G. Riess
A5017158718- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Infrared Target Detection Methodologies
- Astrophysics and Star Formation Studies
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Space Science and Extraterrestrial Life
- Photocathodes and Microchannel Plates
- Neutrino Physics Research
Johns Hopkins University
2015-2024
Space Telescope Science Institute
2015-2024
JSS Science and Technology University
2023
Yale University
2014
Space Science Institute
2013
University of California, Berkeley
1997-2000
Astronomy and Space
1999
Institute of Astronomy
1999
Center for Astrophysics Harvard & Smithsonian
1996-1998
Urban College of Boston
1997
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 ≤ z 0.62. The luminosity distances these objects are determined by methods that employ relations between SN light curve shape. Combined with previous data from our High-z Supernova Search Team recent results Riess et al., this expanded set 16 high-redshift a 34 nearby used to place constraints on following cosmological parameters: Hubble constant (H0), mass density (ΩM), (i.e.,...
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to provide first conclusive evidence for cosmic deceleration that preceded current epoch of acceleration. These objects, during course GOODS ACS Treasury program, include 6 7 highest redshift SNe known, all at z > 1.25, populate diagram in unexplored territory. The luminosity distances these objects 170 previously reported been determined using empirical relations between light-curve shape...
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...
We use the Wide Field Camera 3 (WFC3) on Hubble Space Telescope (HST) to reduce uncertainty in local value of constant (H_0) from 3.3% 2.4%. Improvements come new, near-infrared observations Cepheid variables 11 new hosts recent SNe~Ia, more than doubling sample SNe~Ia having a Cepheid-calibrated distance for total 19; these leverage magnitude-z relation based 300 at z<0.15. All 19 and megamaser system NGC4258 were observed with WFC3, thus nullifying cross-instrument zeropoint errors. Other...
Abstract We present an improved determination of the Hubble constant from Space Telescope (HST) observations 70 long-period Cepheids in Large Magellanic Cloud (LMC). These were obtained with same WFC3 photometric system used to measure extragalactic hosts SNe Ia. Gyroscopic control HST was employed reduce overheads while collecting a large sample widely separated Cepheids. The Cepheid period–luminosity relation provides zero-point-independent link 0.4% precision between new 1.2% geometric...
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...
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and used them to trace history of cosmic expansion over last 10 billion yr. These objects, which include 13 spectroscopically confirmed SNe at z ≥ 1, were during 14 epochs reimaging GOODS fields North South 2 yr Advanced Camera for Surveys on HST. Together a recalibration our previous HST-discovered Ia, full sample 23 1 provides highest redshift known. Combining these data SN sets, we measured H(z)...
The High-z Supernova Search Team has discovered and observed 8 new supernovae in the redshift interval z=0.3-1.2. These independent observations, confirm result of Riess et al. (1998a) Perlmutter (1999) that supernova luminosity distances imply an accelerating universe. More importantly, they extend range consistently SN Ia to z~1, where signature cosmological effects opposite sign some plausible systematic effects. Consequently, these measurements not only provide another quantitative...
This special issue of the Astrophysical Journal Letters is dedicated to presenting initial results from Great Observatories Origins Deep Survey (GOODS) that are primarily, but not exclusively, based on multiband imaging data obtained with Hubble Space Telescope and Advanced Camera for Surveys (ACS). The survey covers roughly 320 arcmin2 in ACS F435W, F606W, F814W, F850LP bands, divided into two well-studied fields. Existing deep observations Chandra X-Ray Observatory ground-based facilities...
Abstract The simplest ΛCDM model provides a good fit to large span of cosmological data but harbors areas phenomenology and ignorance. With the improvement number accuracy observations, discrepancies among key parameters have emerged. most statistically significant tension is 4 σ 6 disagreement between predictions Hubble constant, H 0 , made by early time probes in concert with ‘vanilla’ model, late time, model-independent determinations from local measurements distances redshifts. high...
We use the Wide Field Camera 3 (WFC3) on Hubble Space Telescope to determine constant (H0) from optical and infrared observations of over 600 Cepheid variables in host galaxies 8 recent Type Ia supernovae (SNe Ia), providing calibration for a mag-z relation 253 SNe Ia. Increased precision past measurements comes from: (1) more than doubling number Cepheids nearby SN hosts; (2) increasing sample ideal calibrators six eight; (3) by 20% with megamaser NGC 4258; (4) reducing difference mean...
The High-Z Supernova Search is an international collaboration to discover and monitor Type Ia supernovae (SNe Ia) at z > 0.2 with the aim of measuring cosmic deceleration global curvature. Our has pursued a basic understanding in nearby universe, discovering observing large sample objects developing methods measure accurate distances SNe Ia. This paper describes extension this program ≥ 0.2, outlining our search techniques follow-up program. We have devised high-throughput filters that...
We report observations from HST of Cepheids in the hosts 42 SNe Ia used to calibrate Hubble constant (H0). These include all suitable last 40 years at z<0.01, measured with >1000 orbits, more than doubling sample whose size limits precision H0. The are calibrated geometrically Gaia EDR3 parallaxes, masers N4258 (here tripling that Cepheid sample), and DEBs LMC. were same WFC3 instrument filters (F555W, F814W, F160W) negate zeropoint errors. present multiple verifications photometry tests...
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,...
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
We consider the possibility that black-hole (BH) binary detected by LIGO may be a signature of dark matter. Interestingly enough, there remains window for masses 20M_{⊙}≲M_{bh}≲100M_{⊙} where primordial black holes (PBHs) constitute If two BHs in galactic halo pass sufficiently close, they radiate enough energy gravitational waves to become gravitationally bound. The bound will rapidly spiral inward due emission radiation and ultimately merge. Uncertainties rate such events arise from our...
We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift ~1.7, the farthest SN observed to date. The supernova, 1997ff, was discovered in repeat observation by Hubble Space Telescope (HST) Deep Field-North (HDF-N) and serendipitously monitored with NICMOS on HST throughout Thompson et al. Guaranteed-Time Observer (GTO) campaign. type can be determined from host galaxy type: evolved, red elliptical lacking enough recent star formation provide significant...
We present constraints on the dark energy equation-of-state parameter, w=P/(rho c^2), using 60 Type Ia supernovae (SNe Ia) from ESSENCE supernova survey. derive a set of nature assuming flat Universe. By including (Omega_M, w) baryon acoustic oscillations, we obtain value for static parameter w=-1.05^{+0.13}_{-0.12} (stat; 1 sigma) +- 0.11 (sys) and Omega_M=0.274^{+0.033}_{-0.020} with best-fit chi^2/DoF 0.96. These results are consistent those reported by SuperNova Legacy Survey in similar...
We present an updated version of the multicolor light-curve shape method to measure distances Type Ia supernovae (SNe Ia), incorporating new procedures for K-correction and extinction corrections. also develop a simple model disentangle intrinsic color variations reddening by dust expand incorporate U-band light curves more easily accommodate prior constraints on any parameters. apply this 133 nearby SNe Ia, including 95 objects in Hubble flow (cz ≥ 2500 km s-1), which give dispersion less...
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...