Search Publications
Missions
Journals
Publication Years
Detection of Gravitational Redshift in Open Cluster Nondegenerate Stars
Gutiérrez, Carlos M.; Ramos-Chernenko, Nataliya
A key observational prediction of Einstein's Equivalence Principle is that light undergoes redshift when it escapes from a gravitational field. Although astrophysics provides a wide variety of physical conditions in which this redshift should be significant, until very recently the observational evidence for this gravitational effect was limited t…
Close substellar-mass companions in stellar wide binaries: discovery and characterization with APOGEE and Gaia DR2
Bizyaev, Dmitry; Pan, Kaike; Majewski, Steven R. +12 more
We present a search for close, unresolved companions in a subset of spatially resolved Gaia wide binaries containing main-sequence stars within 200 pc of the Sun, utilizing the APOGEE-Gaia Wide Binary Catalog. A catalogue of 37 wide binaries was created by selecting pairs of stars with nearly identical Gaia positions, parallaxes, and proper motion…
The Temporal and Spatial Behaviors of CME Occurrence Rate at Different Latitudes
Mei, Ying; Wang, Feng; Deng, Hui +3 more
The statistical study of the coronal mass ejections (CMEs) is a hot topic in solar physics. To further reveal the temporal and spatial behaviors of the CMEs at different latitudes and heights, we analyzed the correlation and phase relationships between the occurrence rate of CMEs, the coronal brightness index (CBI), and the 10.7 cm solar radio flu…
A Statistical Detection of Wide Binary Systems in the Ultrafaint Dwarf Galaxy Reticulum II
Loeb, Abraham; Simon, Joshua D.; Safarzadeh, Mohammadtaher
Binary stars can inflate the observed velocity dispersion of stars in dark matter-dominated systems such as ultrafaint dwarf galaxies (UFDs). However, the population of binaries in UFDs is poorly constrained by observations, with preferred binary fractions for individual galaxies ranging from a few percent to near unity. Searching for wide binarie…
The Massive and Distant Clusters of WISE Survey. XI. Stellar Mass Fractions and Luminosity Functions of MaDCoWS Clusters at z 1
Mroczkowski, Tony; Connor, Thomas; Eisenhardt, Peter R. M. +14 more
We present stellar mass fractions and composite luminosity functions (LFs) for a sample of 12 clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) in the redshift range 0.951 ≤ z ≤ 1.43. Using spectral energy distribution fitting of optical and deep mid-infrared photometry, we establish the membership of objects along the lines …
A Study of Dimmings, CMEs, and Flares during the STEREO-SOHO Quadrature
Krista, Larisza D.; Manning, Drew; West, Matthew J.
During the quadrature period (2010 December-2011 August) the STEREO-A and B satellites were approximately at right angles to the SOHO satellite. This alignment was particularly advantageous for determining the coronal mass ejection (CME) properties, since the closer a CME propagates to the plane of sky, the smaller the measurement inaccuracies are…
Physical properties of the molecular cloud, N4, in SS 433: Evidence for an interaction of molecular cloud with the jet from SS 433
Nakanishi, Hiroyuki; Yamamoto, Hiroaki; Imai, Hiroshi +3 more
We conducted observations and analyses of the molecular cloud, N4, which is located at ~40 pc from SS 433 and the same line of sight as that of the radio shell, in 12CO(J = 1-0), 12CO(J = 3-2), 13CO(J = 3-2), and grand-state OH emissions. N4 has a strong gradient of the integrated intensity of 12CO(J = 1…
Bulk Properties of Pickup Ions Derived from the Ulysses Solar Wind Ion Composition Spectrometer Data
Zhang, Ming; Gedalin, Michael; Pogorelov, Nikolai V. +3 more
Nonthermal, pickup ions (PUIs) represent an energetic component of the solar wind (SW). While a number of theoretical models have been proposed to describe the PUI flow, of major importance are in situ measurements providing us with the vital source of model validation. The Solar Wind Ion Composition Spectrometer (SWICS) instrument on board the Ul…
The unusually high dark matter concentration of the galaxy group NGC 1600
Walker, S. A.; Mirakhor, M. S.; Runge, J.
We investigate the properties of the dark matter (DM) halo surrounding the nearby galaxy group NGC 1600. Through the use of deep (252 ks) Chandra observations and 64.3 ks of XMM-Newton observations, we construct surface brightness profiles in multiple energy bands in order to perform hydrostatic equilibrium analysis of the hot plasma within NGC 16…
Carbon Abundances in Compact Galactic Planetary Nebulae: An Ultraviolet Spectroscopic Study with the Space Telescope Imaging Spectrograph (STIS)
Ventura, Paolo; Shaw, Richard A.; García-Hernández, D. A. +3 more
We surveyed a sample of compact Galactic planetary nebulae (PNe) with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope (HST) to determine their gas-phase carbon abundances. Carbon abundances in PNe constrain the nature of their asymptotic giant branch (AGB) progenitors, as well as cosmic recycling. We measured the carbon abun…