Search Publications
Detection of X-rays from the Symbiotic Star V1329 Cyg
Sokoloski, Jennifer L.; Stute, Matthias; Luna, Gerardo J. M.
We report the detection of X-ray emission from the symbiotic star V1329 Cyg with XMM-Newton. The spectrum from the EPIC pn, MOS1, and MOS2 instruments consists of a two-temperature plasma with k T 1 = 0.11+0.02 -0.02 keV and k T 2 = 0.93+0.12 -0.14 keV. Unlike the vast majority of s…
A Suzaku Observation of MCG -2-58-22: Constraining the Geometry of the Circumnuclear Material
Rivers, Elizabeth; Markowitz, Alex; Rothschild, Richard
We have analyzed a long-look Suzaku observation of the active galactic nucleus MCG -2-58-22, a type 1.5 Seyfert with very little X-ray absorption in the line of sight and prominent features arising from reflection off circumnuclear material: the Fe line and Compton reflection hump. We place tight constraints on the power-law photon index (Γ = 1.80…
Updated Analysis of the Upwind Interplanetary Hydrogen Velocity as Observed by the Hubble Space Telescope during Solar Cycle 23
Harris, Walter M.; Ben-Jaffel, Lotfi; Vincent, Frédéric E.
The interplanetary hydrogen (IPH), a population of neutrals that fill the space between planets inside the heliosphere, carries the signature of the interstellar medium (ISM) and the heliospheric interface. As the incoming ISM-ionized component deflects at the heliopause, charge exchange reactions decelerate the bulk motion of the neutrals that pe…
Confirmation of IGR J01363+6610 as a Be X-ray Binary with Very Low Quiescent X-ray Luminosity
Kaaret, Philip; Heinke, Craig; Bodaghee, Arash +4 more
The field containing the candidate High Mass X-ray Binary IGR J01363+6610 was observed by XMM-Newton on 2009 July 31 for 28 ks. A Be star was previously suggested as the possible counterpart of the INTEGRAL source, and although Chandra, during a 2007 observation, did not detect an X-ray source at the position of the Be star, we find a variable sou…
Search for the Optical Counterpart to SGR 0418+5729
Pavlov, George G.; Kargaltsev, Oleg; Durant, Martin
We report broadband Hubble Space Telescope imaging of the field of soft γ-ray repeater SGR 0418+5729 with Advanced Camera for Surveys/Wide Field Channel and Wide Field Camera 3/IR. Observing in two wide filters, F606W and F110W, we find no counterpart within the positional error circle derived from Chandra observations, to limiting magnitudes m
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…