Search Publications
Clathrate Hydrates Formation in Short-Period Comets
Petit, Jean-Marc; Marboeuf, Ulysse; Mousis, Olivier +1 more
The initial composition of current models of cometary nuclei is only based on two forms of ice: crystalline ice for long-period comets and amorphous ice for short-period comets. A third form of ice, i.e., clathrate hydrate, could exist within the short-period cometary nuclei, but the area of formation of this crystalline structure in these objects…
Wide-band Suzaku Analysis of the Persistent Emission from SGR 0501+4516 During the 2008 Outburst
Sakamoto, T.; Tiengo, A.; Hurley, K. +17 more
We observed the soft gamma repeater SGR 0501+4516 with Suzaku for ~51 ks on 2008 August 26-27, about 4 days after its discovery. Following the first paper, which reported on the persistent soft X-ray emission and the wide-band spectrum of an intense short burst, this paper presents an analysis of the persistent broadband (1-70 keV) spectra of this…
Spectroscopic Analysis of an EIT Wave/dimming Observed by Hinode/EIS
Ding, M. D.; Chen, P. F.; Chen, F.
EUV Imaging Telescope (EIT) waves are a wavelike phenomenon propagating outward from the coronal mass ejection source region, with expanding dimmings following behind. We present a spectroscopic study of an EIT wave/dimming event observed by the Hinode/Extreme-ultraviolet Imaging Spectrometer. Although the identification of the wave front is somew…
Fabry-Pérot Versus Slit Spectropolarimetry of Pores and Active Network: Analysis of IBIS and Hinode Data
Judge, Philip G.; Tritschler, Alexandra; Uitenbroek, Han +3 more
We discuss spectropolarimetric measurements of photospheric (Fe I 630.25 nm) and chromospheric (Ca II 854.21 nm) spectral lines in and around small magnetic flux concentrations, including a pore. Our long-term goal is to diagnose properties of the magnetic field near the base of the corona. We compare ground-based two-dimensional spectropolarimetr…
Tracing the Peculiar Dark Matter Structure in the Galaxy Cluster Cl 0024+17 with Intracluster Stars and Gas
Jee, M. J.
Intracluster light (ICL) is believed to originate from the stars stripped from cluster galaxies. They are no longer gravitationally bound to individual galaxies, but to the cluster, and their smooth distribution potentially makes them serve as much denser tracers of the cluster dark matter than the sparsely distributed cluster galaxies. We present…
Highly Ionized Plasma in the Halo of a Luminous Spiral Galaxy Near z = 0.225
Savage, Blair D.; Wakker, Bart P.; Narayanan, Anand
We present analyses of the physical conditions in the z(O VI) = 0.22496 and z(O VI) = 0.22638 multiphase absorption systems detected in the ultraviolet Hubble Space Telescope/STIS and FUSE spectra of the quasar H 1821+643 (mV = 14.2, zem = 0.297). Both absorbers are likely associated with the extended halo of a ~2L* B
Suzaku Broadband Spectroscopy of Swift J1753.5-0127 in the Low-Hard State
Homan, Jeroen; Miller, Jon M.; Miniutti, Giovanni +1 more
We present Suzaku observations of the Galactic black hole candidate Swift J1753.5-0127 in the low-hard state (LHS). The broadband coverage of Suzaku enables us to detect the source over the energy range 0.6-250 keV. The broadband spectrum (2-250 keV) is found to be consistent with a simple power-law (Γ ~ 1.63). In agreement with previous observati…
Early Chromospheric Response During a Solar Microflare Observed With SOHO's CDS and RHESSI
Brosius, Jeffrey W.; Holman, Gordon D.
We observed a solar microflare with RHESSI and SOHO's Coronal Diagnostic Spectrometer (CDS) on 2009 July 5. With CDS we obtained rapid cadence (7 s) stare spectra within a narrow field of view toward the center of AR 11024. The spectra contain emission lines from ions that cover a wide range of temperature, including He I (<0.025 MK), O V (0.25…
Unveiling the Nature of Submillimeter Galaxy SXDF 850.6
Ivison, R. J.; Yun, M. S.; Iono, D. +22 more
We present an 880 µm Submillimeter Array (SMA) detection of the submillimeter galaxy SXDF 850.6. SXDF 850.6 is a bright source (S 850 µm = 8 mJy) detected in the SCUBA Half Degree Extragalactic Survey and has multiple possible radio counterparts in its deep radio image obtained at the VLA. Our new SMA detection finds that th…
A Search for Star-Disk Interaction among the Strongest X-ray Flaring Stars in the Orion Nebula Cluster
Stassun, Keivan G.; Matt, Sean P.; Aarnio, Alicia N.
The Chandra Orion Ultradeep Project observed hundreds of young, low-mass stars undergoing highly energetic X-ray flare events. The 32 most powerful cases have been previously modeled with the result that the magnetic structures responsible for these flares can be many stellar radii in extent. In this paper, we model the observed spectral energy di…