Search Publications
Tycho-Gaia Astrometric Solution Parallaxes and Proper Motions for Five Galactic Globular Clusters
van der Marel, Roeland P.; Watkins, Laura L.
We present a pilot study of Galactic globular cluster (GC) proper motion (PM) determinations using Gaia data. We search for GC stars in the Tycho-Gaia Astrometric Solution (TGAS) catalog from Gaia Data Release 1 (DR1), and identify five members of NGC 104 (47 Tucanae), one member of NGC 5272 (M3), five members of NGC 6121 (M4), seven members of NG…
Overdensities of SMGs around WISE-selected, ultraluminous, high-redshift AGNs
Tsai, Chao-Wei; Wright, Edward L.; Eisenhardt, Peter +9 more
We investigate extremely luminous dusty galaxies in the environments around Wide-field Infrared Survey Explorer (WISE)-selected hot dust-obscured galaxies (Hot DOGs) and WISE/radio-selected active galactic nuclei (AGNs) at average redshifts of z = 2.7 and 1.7, respectively. Previous observations have detected overdensities of companion submillimet…
Toward the Understanding of the Physical Origin of Recombining Plasma in the Supernova Remnant IC 443
Uchida, Hiroyuki; Tsuru, Takeshi Go; Tanaka, Takaaki +2 more
We perform a spatially resolved spectroscopic analysis of X-ray emission from the supernova remnant (SNR) IC 443 with Suzaku. All of the spectra are well reproduced by a model consisting of a collisional ionization equilibrium (CIE) and two recombining plasma (RP) components. Although previous X-ray studies found an RP in the northeastern region, …
The Solar Neighborhood. XXXX. Parallax Results from the CTIOPI 0.9 m Program: New Young Stars Near the Sun
Henry, Todd J.; Winters, Jennifer G.; Jao, Wei-Chun +6 more
As a step toward completing and characterizing the census of the solar neighborhood, we present astrometric, photometric, and spectroscopic observations of 32 systems observed with the Cerro Tololo Inter-American Observatory 0.9 m and 1.5 m telescopes. Astrometry from the 0.9 m indicates that among the 17 systems that had no previous published tri…
Comparing and contrasting dispersionless injections at geosynchronous orbit during a substorm event
Daly, P. W.; Khotyaintsev, Y.; Kozak, L. +3 more
Particle injections in the magnetosphere transport electrons and ions from the magnetotail to the radiation belts. Here we consider generation mechanisms of "dispersionless" injections, namely, those with simultaneous increase of the particle flux over a wide energy range. In this study we take advantage of multisatellite observations which simult…
Evolution of Spin, Orbital, and Superorbital Modulations of 4U 0114+650
Hu, Chin-Ping; Chou, Yi; Ng, C. -Y. +2 more
We report a systematic analysis of the spin, orbital, and superorbital modulations of 4U 0114+650, a high-mass X-ray binary that consists of one of the slowest spinning neutron stars. Using the dynamic power spectrum, we found that the spin period varied dramatically and is anticorrelated with the long-term X-ray flux variation that can be observe…
Mode Conversion of a Solar Extreme-ultraviolet Wave over a Coronal Cavity
Dai, Yu; Zong, Weiguo
We report on observations of an extreme-ultraviolet (EUV) wave event in the Sun on 2011 January 13 by Solar Terrestrial Relations Observatory and Solar Dynamics Observatory in quadrature. Both the trailing edge and the leading edge of the EUV wave front in the north direction are reliably traced, revealing generally compatible propagation velociti…
Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula
Smith, Nathan; Bally, John; Reiter, Megan +1 more
We present proper motion measurements of 37 jets and HH objects in the Carina Nebula measured in two epochs of H α images obtained ∼10 yr apart with Hubble Space Telescope/Advanced Camera for Surveys (ACS). Transverse velocities in all but one jet are faster than ≳ 25 km s-1, confirming that the jet-like H α features identified in the f…
Statistical study of Saturn's auroral electron properties with Cassini/UVIS FUV spectral images
Lamy, L.; Grodent, D.; Radioti, A. +3 more
About 2000 FUV spectra of different regions of Saturn's aurora, obtained with Cassini/UVIS from December 2007 to October 2014 have been examined. Two methods have been employed to determine the mean energy <;E> of the precipitating electrons. The first is based on the absorption of the auroral emission by hydrocarbons and the second uses the…
Cosmological searches for a noncold dark matter component
Mena, Olga; Gariazzo, Stefano; Diamanti, Roberta +1 more
We explore an extended cosmological scenario where the dark matter is an admixture of cold and additional noncold species. The mass and temperature of the noncold dark matter particles are extracted from a number of cosmological measurements. Among others, we consider tomographic weak lensing data and Milky Way dwarf satellite galaxy counts. We al…