A5008190500- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Historical Astronomy and Related Studies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Space Satellite Systems and Control
- Astrophysics and Star Formation Studies
- Geophysics and Sensor Technology
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Historical, Religious, and Philosophical Studies
- Ancient Egypt and Archaeology
- Diverse Historical and Scientific Studies
- Dark Matter and Cosmic Phenomena
- History of Science and Medicine
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Inertial Sensor and Navigation
- Superconducting and THz Device Technology
Columbia University
2022-2025
Max Planck Institute for Astrophysics
2022-2023
University of Pennsylvania
2021-2023
University of Virginia
1969-1999
McCormick (United States)
1966-1969
Harvard College Observatory
1964
Current cosmological data exhibit discordance between indirect and some direct inferences of the present-day expansion rate H_{0}. Early dark energy (EDE), which briefly increases cosmic prior to recombination, is a leading scenario for resolving this "Hubble tension" while preserving good fit microwave background (CMB) data. However, comes at cost changes in parameters that affect structure formation late-time universe, including spectral index scalar perturbations n_{s}. Here, we present...
ABSTRACT We present measurements of the radial profiles mass and galaxy number density around Sunyaev–Zel’dovich (SZ)-selected clusters using both weak lensing counts. The are selected from Atacama Cosmology Telescope Data Release 5 galaxies Dark Energy Survey Year 3 data set. With signal-to-noise ratio 62 (45) for (weak lensing) over scales about 0.2–20 h−1 Mpc, these highest precision SZ-selected to date. Because SZ selection closely approximates selection, enable several tests theoretical...
The resonant conversion of cosmic microwave background (CMB) photons into axions within large-scale structure induces an anisotropic spectral distortion in CMB temperature maps. Applying state-of-the-art foreground cleaning techniques to Planck observations, we construct maps axion-induced "patchy screening" the CMB. We cross-correlate these with data from unWISE galaxy survey and find no evidence axions. constrain axion-photon coupling, g_{aγγ}≲2×10^{-12} GeV^{-1}, at 95% confidence level...
ABSTRACT We study the population of galaxies around galaxy clusters in hydrodynamic simulation suite IllustrisTNG 300-1 to signatures their evolutionary history on observable properties. measure radial number density profile, phase space distribution, and splashback radius for different masses colours over redshift range z = 0−1. The three primary physical effects which shape distribution within are quenching, angular momentum dynamical friction. find distinct populations by applying a...
We show how consistency relations can be used to robustly extract the amplitude of local primordial non-Gaussianity (${f}_{\mathrm{NL}}$) from squeezed limit matter bispectrum, well into nonlinear regime. First, we derive a nonperturbative relation between and leading term in revising some results present literature. This is then successfully measure ${f}_{\mathrm{NL}}$ $N$-body simulations. discuss dependence our on different scale cuts redshifts. Specifically, analysis strongly dependent...
We introduce a nonperturbative method to constrain the amplitude of local-type primordial non-Gaussianity (${f}_{\mathrm{NL}}$) using squeezed configurations CMB lensing convergence and cosmic shear bispectra. First, we use cosmological consistency relations derive model for limit angular auto- cross-bispectra fields in presence ${f}_{\mathrm{NL}}$. Using this model, perform Fisher forecast with specifications expected upcoming measurements from Simons Observatory CMB-S4, as well Rubin...
Massive particles produced during inflation impact soft limits of primordial correlators. Searching for these signatures presents an exciting opportunity to uncover the particle spectrum in inflationary epoch. We present nonperturbative methods constrain intermediate-mass scalars ($0\ensuremath{\le}m/H<3/2$, where $H$ is Hubble scale) inflation, which give rise a power-law scaling squeezed bispectrum. Exploiting large-scale structure consistency relations and separate universe approach, we...
view Abstract Citations (38) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Star formation in II Zw 70. Oconnell, R. W. ; Thuan, T. X. Goldstein, S. J. Optical and radio data on the 'isolated extragalactic H region' 70 are discussed. Its integrated properties, including its I content, similar to those of normal late-type systems with comparable luminosities. Despite a metal deficiency 0.5 log, this applies chemical composition as well....
We analyze the clustering of galaxies using z=1.006 snapshot CosmoDC2 simulation, a high-fidelity synthetic galaxy catalog designed to validate analysis methods for Large Synoptic Survey Telescope (LSST). present sub-percent measurements auto-correlation and galaxy-dark matter cross correlations in Fourier space configuration magnitude-limited sample. At these levels precision, statistical errors measurement are comparable systematic effects simulation procedure; nevertheless, hybrid-PT...
We baseline with current cosmological observations to forecast the power of Dark Energy Spectroscopic Instrument (DESI) in two ways: (1) gain constraining parameter combinations standard $\mathrm{\ensuremath{\Lambda}}\mathrm{CDM}$ model, and (2) reconstruction quintessence models dark energy. For former task we use a recently developed formalism extract leading constrained by different survey data. latter, perform nonparametric using effective field theory Using mock DESI Hubble parameter,...
The circularly polarized emission from the pulsar CP 0328 has an approximately flat spectrum in 1-megahertz band centered at 113.6 megahertz, whereas linearly varies with frequency and pulse to pulse. A simple model for source that a constant Faraday rotation measure fits some of spectra observed individual pulses, but changes as much 30 radians per square meter are required between adjacent pulses. does not fit average emission, although had same form on two nights.
view Abstract Citations (13) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radio sources in globular cluster fields. Rood, R. T. ; Turner, K. C. Goldstein, S. J. A search of fields has been performed at 1400 MHz using the NRAO interferometer. Twelve were found within tidal radii, and six these first detections. Fluxes or good upper limits obtained for all except one 2695 8085 MHz. With flux information least three frequencies, it is that four...
A fixed-horn antenna having a beam 10 degrees by , and switched-load radiometer with traveling-wave-maser preamplifier were used to observe the 21-cm spectrum of Virgo cluster galaxies. An upper limit temperature is 0.024 K relative regions outside filters whose width 2 Mc/sec. If excitation intergalactic hydrogen enough greater than background continuum radiation so that absorption can be ignored, if velocity defined galaxies, density optically thin neutral in does not exceed an amount...
We describe radar observations at 8510 MHz of 39 small particles in Earth orbit. The altitudes vary between 510 and 1550 km, while the radial velocities lie -310 +520 m/s. Regarding all as belonging to one statistical population, we calculate with principle least squares a best fitting semimajor axis eccentricity. simimajor is (7450+98/-92) eccentricity (0.039+0.012/-0.016).
cm Continuum Observations of Discrete Sources. S. J. GOLDSTEIN, JR., Harvard College Observatory, Agassiz Station, Harvard, Massachusetts. -The switched maser radiometer mounted on the 60-foot reflector at Observatory has been used 1422.4 Mc to observe continuum sources, selected from survey 85.7 by Mills, Slee, and Hill. This paper is a report 18 sources galactic latitudes greater than 90 for which positive results have obtained in good positional agreement with those reported Mc. The...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text S. Goldstein and R. J. Massa, "Spatial Enhancement of Continuous Negative Afterimage Phenomenon," Opt. Soc. Am. 53, 761-763 (1963) Export BibTex Endnote (RIS) HTML Plain alert Save article
Some properties of current-loop models are explored, and some implications discussed. The elliptical ring observed to be centered on the supernova can interpreted as light from ions trapped in magnetic field a circular current loop. is 1.5*10/sup 12/ A for model where gravitational force 0.03 solar masses matter balances electrodynamic expansion energy loop 2*10/sup 41/ erg. Consideration magnetized clouds wind an analogous source such leads conclusion that formed over lifetime progenitor...