Search Publications
Physical Properties of Large and Small Granules in Solar Quiet Regions
Yang, Shuhong; Zhang, Jun; Wang, Jingxiu +3 more
The normal mode observations of seven quiet regions obtained by the Hinode spacecraft are analyzed to study the physical properties of granules. An artificial intelligence technique is introduced to automatically find the spatial distribution of granules in feature spaces. In this work, we investigate the dependence of granular continuum intensity…
Morphology of the Red Rectangle Proto-planetary Nebula
Kwok, Sun; Steffen, W.; Koning, N.
The morphology of the Red Rectangle (RR) exhibits several singular attributes. Most prominent are a series of linear features perpendicular to the symmetry axis which appear as "ladder rungs" across the nebula. At the edge of each "rung" gas seemingly flows from bright knots in a parabolic shape toward the center of the nebula. We present a new mo…
Suzaku Diagnostics of the Energetics in the Lobes of the Giant Radio Galaxy 3C 35
Isobe, Naoki; Gandhi, Poshak; Tashiro, Makoto S. +1 more
The Suzaku observation of a giant radio galaxy 3C 35 revealed faint extended X-ray emission, associated with its radio lobes and/or host galaxy. After careful subtraction of the X-ray and non-X-ray background and contaminating X-ray sources, the X-ray spectrum of the faint emission was reproduced by a sum of the power-law (PL) and soft thermal com…
Rapid Enhancement of Sheared Evershed Flow Along the Neutral Line Associated with an X6.5 Flare Observed by Hinode
Liu, Chang; Wang, Haimin; Deng, Na +1 more
We present G-band and Ca II H observations of NOAA AR 10930 obtained by Hinode/SOT on 2006 December 6 covering an X6.5 flare. The Local Correlation Tracking technique was applied to the foreshortening-corrected G-band image series to acquire horizontal proper motions in this complex βγδ active region. With the continuous high-quality, spatial and …
FIR Measurements of Lyα Emitters at z <~ 1.0: Dust Attenuation from PACS-Herschel
Berta, S.; Magnelli, B.; Lutz, D. +24 more
One remaining open question regarding the physical properties of Lyα emitters (LAEs) is their dust content and evolution with redshift. The variety of results is large and with those reported by now it is difficult to establish clear relations between dust, other fundamental parameters of galaxies (star formation rate, metallicity, or age), and re…
Discovery of the Disturbed Radio Morphology in the Interacting Binary Quasar FIRST J164311.3+315618
Janiuk, Agnieszka; Kunert-Bajraszewska, Magdalena
We report the high-resolution radio observations and the subsequent analysis of the radio-loud compact steep spectrum quasar FIRST J164311.3+315618, one of the members of a binary system. The second component of the system is a radio-quiet active galactic nucleus. The projected separation of this pair is 2farcs3 (15 kpc) it is one of the smallest-…
Space Telescope Imaging Spectrograph Spectroscopy of the Central 14 pc OF NGC 3998: Evidence for an Inflow
Devereux, Nick
Prior imaging of the lenticular galaxy, NGC 3998, with the Hubble Space Telescope revealed a small, highly inclined, nuclear ionized gas disk, the kinematics of which indicate the presence of a 270 million solar mass black hole. Plausible kinematic models are used to constrain the size of the broad emission line region (BELR) in NGC 3998 by modeli…
The Abundance of Boron in Diffuse Interstellar Clouds
Lambert, D. L.; Federman, S. R.; Sheffer, Y. +1 more
We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope. Our sample of 56 Galactic sight lines is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirm…
Simulating the Effects of Initial Pitch-angle Distributions on Solar Flares
Reeves, Katharine K.; Martens, Petrus; Winter, Henry D.
In this work, we model both the thermal and non-thermal components of solar flares. The model we use, HYLOOP, combines a hydrodynamic equation solver with a non-thermal particle tracking code to simulate the thermal and non-thermal dynamics and emission of solar flares. In order to test the effects of pitch-angle distribution on flare dynamics and…
AGN Unification at z ~ 1: u - R Colors and Gradients in X-Ray AGN Hosts
Kocevski, Dale D.; Bouwens, Rychard J.; McGrath, Elizabeth J. +8 more
We present uncontaminated rest-frame u - R colors of 78 X-ray-selected active galactic nucleus (AGN) hosts at 0.5 < z < 1.5 in the Chandra Deep Fields measured with Hubble Space Telescope (HST)/Advanced Camera for Surveys/NICMOS and Very Large Telescope/ISAAC imaging. We also present spatially resolved NUV - R color gradients for a subsample…