A5009555939- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Planetary Science and Exploration
- Pulsars and Gravitational Waves Research
- Growth Hormone and Insulin-like Growth Factors
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Neutrino Physics Research
- Isotope Analysis in Ecology
- CCD and CMOS Imaging Sensors
- Adipose Tissue and Metabolism
- Space Exploration and Technology
- Hypothalamic control of reproductive hormones
- Solar and Space Plasma Dynamics
- Diet and metabolism studies
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Spacecraft and Cryogenic Technologies
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
Yale University
2015-2024
The Ohio State University
2018
Rambam Health Care Campus
1999-2017
Technion – Israel Institute of Technology
1999-2017
Lawrence Berkeley National Laboratory
2003-2016
University of Oregon
2015
University of Bonn
2014
Nova Southeastern University
2010-2011
Yale Cancer Center
2005
Hebrew University of Jerusalem
2001-2004
Species distribution models (SDMs) are numerical tools that combine observations of species occurrence or abundance with environmental estimates. They used to gain ecological and evolutionary insights predict distributions across landscapes, ...Read More
We present photometric and spectroscopic observations of SN 2007if, an overluminous (MV = −20.4), red (B − V 0.16 at B-band maximum), slow-rising (trise 24 days) type Ia supernova (SN Ia) in a very faint (Mg −14.10) host galaxy. A spectrum 5 days past maximum light is direct match to the super-Chandrasekhar-mass candidate 2003fg, showing Si ii C ∼9000 km s−1. high signal-to-noise co-addition spectral time series reveals no Na i D absorption, suggesting negligible reddening galaxy, late-time...
High-quality collections of Type II supernova (SN) light curves are scarce because they evolve for hundreds days, making follow-up observations time consuming and often extending over multiple observing seasons. In these difficulties, the diversity SNe is not fully understood. Here we present ultraviolet optical photometry 12 monitored by Las Cumbres Observatory Global Telescope Network during 2013 to 2014, compare them with previously studied having well-sampled curves. We explore SN...
Previously we used the Nearby Supernova Factory sample to show that Type Ia supernovae (SNe Ia) having locally star-forming environments are dimmer than SNe passive environments. Here use Constitution together with host galaxy data from GALEX independently confirm result. The effect is seen using both SALT2 and MLCS2k2 lightcurve fitting standardization methods, brightness differences of 0.094 ± 0.037 mag for 0.155 0.041 RV = 2.5. When combined our previous measurement 0.025 SALT2. If ratio...
The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. We describe the data reduction strategy and products which are publicly available through ESO archive Data Release 1 (SSDR1). PESSTO uses New Technology Telescope with EFOSC2 SOFI to provide optical NIR spectroscopy imaging. target supernovae transients brighter than 20.5mag for classification. Science targets then selected follow-up based on...
As part of an on-going effort to identify, understand and correct for astrophysics biases in the standardization Type Ia supernovae (SNIa) cosmology, we have statistically classified a large sample nearby SNeIa into those located predominantly younger or older environments. This classification is based on specific star formation rate measured within projected distance 1kpc from each SN location (LsSFR). important refinement compared using local directly as it provides normalization relative...
Abstract A system of 5020 robotic fiber positioners was installed in 2019 on the Mayall Telescope, at Kitt Peak National Observatory. The robots automatically retarget their optical fibers every 10–20 minutes, each to a precision several microns, with reconfiguration time fewer than 2 minutes. Over next 5 yr, they will enable newly constructed Dark Energy Spectroscopic Instrument (DESI) measure spectra 35 million galaxies and quasars. DESI produce largest 3D map universe date expansion...
We report Nearby Supernova Factory observations of SN 2005gj, the second confirmed case a "hybrid" Type Ia/IIn supernova. Our early-phase photometry 2005gj shows that interaction is much stronger than for prototype, 2002ic. first spectrum hot continuum with broad and narrow H-alpha emission. Later spectra, spanning over 4 months from outburst, show clear Ia features combined H-gamma, H-beta, HeI 5876,7065 in At higher resolution, P Cygni profiles are apparent. Surprisingly, we also observe...
To improve the usefulness of testing pituitary function by response human growth hormone (HGH) to I.V. arginine loads, infusions were given under a variety conditions healthy subjects aged 17 35. The minimum effective load causing release HGH was 1/6 gm per pound body weight in men and 1/12 women. At each three dosage schedules used, women responded with greater increases plasma than men. Treatment diethylstilbestrol augmented their arginine, whereas methyltestosterone pretreatment did not...
The nearby supernova SN 2011fe can be observed in unprecedented detail. Therefore, it is an important test case for Type Ia (SN Ia) models, which may bring us closer to understanding the physical nature of these objects. Here, we explore how available and expected future observations used constrain explosion scenarios. We base our discussion on three-dimensional simulations a delayed detonation Chandrasekhar-mass white dwarf violent merger two dwarfs-realizations models appropriate most...
We have measured the periods and light curves of 148 RR Lyrae variables from V = 13.5 to 19.7 first 100 deg2 Quasar Equatorial Survey Team survey. Approximately 55% these stars belong clump detected earlier by Sloan Digital Sky Survey. According our measurements, this feature has ~10 times background density halo stars, spans at least 375 35 in α δ (≥30 ≥3 kpc), lies ~50 kpc Sun, a depth along line sight ~5 (1 σ). These properties are consistent with recent models that suggest it is tidal...
We present 32 epochs of optical (3300-9700 \AA) spectrophotometric observations the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in galaxy M101, extending from -15 to +97 d with respect B-band maximum, obtained by Nearby Supernova Factory collaboration. is closest (\mu = 29.04) and brightest (Bmax 9.94 mag) observed since advent modern large scale programs for intensive periodic followup supernovae. Both synthetic light curve measurements spectral feature analysis...
We report the discovery of minor planet (90377) Sedna, most distant object ever seen in solar system. Prediscovery images from 2001, 2002, and 2003 have allowed us to refine orbit sufficiently conclude that Sedna is on a highly eccentric permanently resides well beyond Kuiper Belt with semimajor axis 480 ± 40 AU perihelion 76 4 AU. Such an unexpected our current understanding system but could be result scattering by yet-to-be-discovered planet, perturbation anomalously close stellar...
We assemble a sample of 24 hydrogen-poor super-luminous supernovae (SLSNe). Parameterizing the light curve shape through rise and decline timescales shows that two are highly correlated. Magnetar-powered models can reproduce correlation, with diversity in rates driven by diffusion timescale. Circumstellar interaction exhibit similar rise-decline relation, but only for narrow range densities, which may be problematic these models. find SLSNe approximately 3.5 magnitudes brighter have curves 3...
To investigate the role of glucagon in regulating hepatic glucose production man, selective deficiency was produced four normal men by infusing somatostatin (0.9 mg/h) and regular pork insulin (150-muU/kg per min) for 2 h. Exogenous infused to maintain euglycemia. Arterial plasma levels fell greater than 50% whereas were maintained range 10-14 muU/ml. In response these hormonal changes, net splanchnic (NSGP) 75% remained suppressed duration study. contrast, when alone administered men,...
We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and properties of their host galaxies using a sample 115 SNe from Nearby Supernova Factory. use galaxy stellar masses specific star formation rates fitted photometry for all hosts, as well gas-phase metallicities subset 69 star-forming (non-active galactic nucleus) to show that SN correlate with each these properties. With data we find new evidence correlation intrinsic color metallicity. When combine our those...
THE carcinoid syndrome is characterized by episodes of flushing that appear to be secondary the secretion one or more substances a tumor enterochromaffin-cell origin.1 2 3 Flushing can provoked pharmacologically administration epinephrine,4 isoproterenol,5 ethanol,6 and calcium.7 A number physiologic stimuli have also been reported trigger flushing, most notably food intake.1 Stimulated observation pentagastrin evoked in two patients with medullary carcinoma thyroid (Roberts LJ, McKenna TJ,...