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Phase compensation of MARSIS subsurface sounding data and estimation of ionospheric properties: New insights from SHARAD results
Campbell, Bruce A.; Watters, Thomas R.
Subsurface radar sounding observations by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) and Shallow Radar (SHARAD) instruments are affected by ionospheric phase distortions that lead to image blurring and delay offsets. Based on experience with SHARAD image correction, we propose that ionospheric blurring in MARSIS radar…
Search for gas bulk motions in eight nearby clusters of galaxies with Suzaku
Ota, Naomi; Yoshida, Hiroko
To search for bulk motions of the intracluster medium, we analyzed X-ray spectra taken with the Suzaku satellite, and measured the Doppler shift of the Fe-K line emission from eight nearby clusters of galaxies with various X-ray morphologies. In the cores of the Centaurus and Perseus clusters, the gas bulk velocity does not exceed the sound veloci…
Amazonian-aged fluvial system and associated ice-related features in Terra Cimmeria, Mars
Le Deit, Laetitia; Hauber, Ernst; Jaumann, Ralf +4 more
The Martian climate throughout the Amazonian is widely believed to have been cold and hyper-arid, very similar to the current conditions. However, ubiquitous evidence of aqueous and glacial activity has been recently reported, including channels that can be tens to hundreds of kilometres long, alluvial and fluvial deposits, ice-rich mantles, and g…
The view of AGN-host alignment via reflection spectroscopy
Fabian, Andrew C.; Reynolds, Christopher S.; Middleton, Matthew J. +2 more
The fuelling of active galactic nuclei (AGN) - via material propagated through the galactic disc or via minor mergers - is expected to leave an imprint on the alignment of the sub-pc disc relative to the host galaxy's stellar disc. Determining the inclination of the inner disc usually relies on the launching angle of the jet; here instead we use t…
Peak of spectral energy distribution plays an important role in intra-day variability of blazars?
Gupta, Alok C.; Kalita, Nibedita; Gaur, Haritma +1 more
Blazars can be divided into two sub-classes namely high energy and low energy peaked blazars. In spectral energy distribution, the first synchrotron hump of the former class peaks in UV/X-rays and in IR/optical bands for the latter class. The peak of the spectral energy distribution seems to be responsible for variability properties of these class…
A pair of O VI and broad Ly α absorbers probing warm gas in a galaxy group environment at z ∼ 0.4
Savage, Blair D.; Wakker, Bart P.; Muzahid, Sowgat +4 more
We report the detection of two O VI absorbers at z = 0.416 14 and 0.419 50 (|Δv| = 710 km s-1), towards SBS 0957+599. Both absorbers are multiphase systems tracing substantial reservoirs of warm baryons. The low- and intermediate-ionization metals in the z = 0.416 14 absorber are consistent with an origin in photoionized gas. O VI has a…
Sources of the Slow Solar Wind During the Solar Cycle 23/24 Minimum
Madjarska, M. S.; Kilpua, E. K. J.; Wiegelmann, T. +4 more
We investigate the characteristics and the sources of the slow (<450 kms−1) solar wind during the four years (2006 - 2009) of low solar activity between Solar Cycles 23 and 24. We used a comprehensive set of in-situ observations in the near-Earth solar wind (Wind and ACE) and removed the periods when large-scale interplanetary corona…
Molecule survival in magnetized protostellar disk winds. II. Predicted H2O line profiles versus Herschel/HIFI observations
Ferreira, J.; Pineau des Forêts, G.; Cabrit, S. +1 more
Context. The origin of molecular protostellar jets and their role in extracting angular momentum from the accreting system are important open questions in star formation research. In the first paper of this series we showed that a dusty magneto-hydrodynamic (MHD) disk wind appeared promising to explain the pattern of H2 temperature and …
A classification of martian gullies from HiRISE imagery
Auld, Katherine S.; Dixon, John C.
Due to the large and varied population of gullies observed in Mars High Resolution Imaging Science Experiment (HiRISE) imagery that exhibit diverse characteristics, this paper develops a classification of martian gullies based on their morphological characteristics. This provides a firmer foundation for future investigation of the genesis of diffe…
Origin and evolution of two-component debris discs and an application to the q1 Eridani system
Kirchschlager, Florian; Booth, Mark; Krivov, Alexander V. +3 more
Many debris discs reveal a two-component structure, with an outer Kuiper-belt analogue and a warm inner component whose origin is still a matter of debate. One possibility is that warm emission stems from an `asteroid belt' closer in to the star. We consider a scenario in which a set of giant planets is formed in an initially extended planetesimal…