Search Publications
Structural analysis of interior layered deposits in Northern Coprates Chasma, Mars
Hauber, E.; Gwinner, K.; McGuire, P. C. +5 more
Interior layered deposits within an embayment on the northern wall of Coprates Chasma in the Valles Marineris, Mars, are studied using HRSC, CTX, HiRISE and CRISM data. The layered material outcrops in three separate locations. The largest layered deposit within the embayment, a free standing central mound, has an approximate stratigraphic thickne…
Hier ist wahrhaftig ein Loch im Himmel. The NGC 1999 dark globule is not a globule
Maret, S.; Henning, T.; Manoj, P. +22 more
The NGC 1999 reflection nebula features a dark patch with a size of 10 000 AU, which has been interpreted as a small, dense foreground globule and possible site of imminent star formation. We present Herschel PACS far-infrared 70 and 160 µm maps, which reveal a flux deficit at the location of the globule. We estimate the globule mass needed …
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…
Application of Double Beltrami states to solar eruptions
Kagan, D.; Mahajan, S. M.
We show that the general class of Double Beltrami (DB) states, which are the lowest energy equilibria of Hall magnetohydrodynamics, can have characteristics similar to those of active regions in the solar corona and is capable of undergoing a catastrophe that can cause a solar eruption, such as a flare or coronal mass ejection (CME). We then show …
Detection of the high z GRB 080913 and its implications on progenitors and energy extraction mechanisms
Bremer, M.; Jóhannesson, G.; Pérez-Ramírez, D. +15 more
Aims: We present multiwavelength observations of one of the most distant gamma-ray bursts detected so far, GRB 080913. Based on these observations, we consider whether it could be classified as a short-duration GRB and discuss the implications for the progenitor nature and energy extraction mechanisms.
Methods: Multiwavelength X-ray, nea…
Multiwavelength observations of a giant flare on CN Leonis. III. Temporal evolution of coronal properties
Liefke, C.; Schmitt, J. H. M. M.; Fuhrmeister, B.
Context. Stellar flares affect all atmospheric layers from the photosphere over chromosphere and transition region up into the corona. Simultaneous observations in different spectral bands allow to obtain a comprehensive picture of the environmental conditions and the physical processes going on during different phases of the flare.
Aims: We …
Spicule Dynamics over a Plage Region
Matsumoto, Takuma; Shibata, Kazunari; Ichimoto, Kiyoshi +14 more
We studied spicular jets over a plage area and derived their dynamic characteristics using Hinode Solar Optical Telescope (SOT) high-resolution images. A target plage region was near to the west limb of the solar disk. This location permitted us to study the dynamics of spicular jets without any overlapping effect of spicular structures along the …
Swift follow-up observations of 13 INTEGRAL sources
Tomsick, J. A.; Rodriguez, J.; Bodaghee, A.
The various IBIS/ISGRI catalogues contain a large population of hard X-ray sources whose nature is still unknown. Even if the >20 keV positional uncertainty provided by ISGRI is unprecedented, it is still too large to pinpoint the counterpart at other wavelengths, which is the only secure way of obtaining a source identification. We continue th…
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…