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A Detailed Morpho-kinematic Model of the Eskimo, NGC 2392: A Unifying View with the Cat's Eye and Saturn Planetary Nebulae
López, J. A.; Steffen, W.; García-Díaz, Ma. T. +1 more
The three-dimensional and kinematic structure of the Eskimo nebula, NGC 2392, has been notoriously difficult to interpret in detail given its complex morphology, multiple kinematic components and its nearly pole-on orientation along the line of sight. We present a comprehensive, spatially resolved, high-resolution, long-slit spectroscopic mapping …
The Long-term X-Ray Variability of Broad Absorption Line Quasars
Bauer, F. E.; Brandt, W. N.; Garmire, G. P. +2 more
We analyze the long-term (rest-frame 3-30 yr) X-ray variability of 11 broad absorption line (BAL) quasars, mainly to constrain the variation properties of the X-ray absorbing shielding gas that is thought to play a critical role in BAL wind launching. Our BAL quasar sample has coverage with multiple X-ray observatories including Chandra, XMM-Newto…
The CH4 structure in Titan's upper atmosphere revisited
Strobel, D. F.; Galand, M.; Yelle, R. V. +4 more
In this study, we reanalyze the CH4 structure in Titan's upper atmosphere combining the Cassini Ion Neutral Mass Spectrometer (INMS) data from 32 flybys and incorporating several updates in the data reduction algorithms. We argue that based on our current knowledge of eddy mixing and neutral temperature, strong CH4 escape mus…
Analysis of disk-resolved OMEGA and CRISM spectral observations of Phobos and Deimos
Bibring, J. -P.; Arvidson, R. E.; Gondet, B. +8 more
Disk-resolved observations of Phobos acquired by OMEGA at a range of lighting and viewing geometries were fit with the Hapke photometric function to solve for the single particle phase function and single scattering albedos from 0.4 to 2.5 µm. Single scattering albedos were recovered from CRISM observations of Phobos using the OMEGA derived …
Systematic study of X-ray cavities in the brightest galaxy in the Draco constellation NGC 6338
David, L. P.; Pandge, M. B.; Patil, M. K. +1 more
We present results based on the systematic analysis of currently available Chandra archive data on the brightest galaxy in the Draco constellation, NGC 6338, in order to investigate the properties of the X-ray cavities. In the central ∼6 kpc, at least two, possibly three, X-ray cavities are evident. All these cavities are roughly of ellipsoidal sh…
L* neural networks from different magnetic field models and their applicability
Yu, Yiqun; Zaharia, Sorin; Koller, Josef +1 more
The third adiabatic invariant L* plays an important role in modeling and understanding the radiation belt dynamics. The typical way to numerically calculate the L* value follows the method described by Roederer (1970), which is just a line integration method that is computationally slow and expensive. This work describes the application of an arti…
Herschel-ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data
Ivison, R. J.; Sutherland, W.; González-Nuevo, J. +38 more
We identify near-infrared Ks-band counterparts to Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources, using a preliminary object catalogue from the VISTA Kilo-degree Infrared Galaxy (VIKING) survey. The submm sources are selected from the H-ATLAS Phase 1 catalogue of the Galaxy and Mass Assembly 9…
Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
Nakariakov, V. M.; Shibasaki, K.; Yan, Y. +3 more
Aims: We analysed 3-min oscillations of microwave and extreme ultraviolet (EUV) emission generated at different heights of a sunspot atmosphere, studied the amplitude and frequency modulation of the oscillations, and its relationship with the variation of the spatial structure of the oscillations.
Methods: High-resolution data obtained w…
Granular-Scale Elementary Flux Emergence Episodes in a Solar Active Region
van Driel-Gesztelyi, L.; Bellot Rubio, L. R.; Vargas Domínguez, S.
We analyse data from Hinode spacecraft taken over two 54-minute periods during the emergence of AR 11024. We focus on small-scale portions within the observed solar active region and discover the appearance of very distinctive small-scale and short-lived dark features in Ca II H chromospheric filtergrams and Stokes I images. The features appear in…
A Multi-epoch Timing and Spectral Study of the Ultraluminous X-Ray NGC 5408 X-1 with XMM-Newton
Pasham, Dheeraj R.; Strohmayer, Tod E.
We present results of new XMM-Newton observations of the ultraluminous X-ray source (ULX) NGC 5408 X-1, one of the few ULXs to show quasi-periodic oscillations (QPOs). We detect QPOs in each of four new (≈100 ks) pointings, expanding the range of frequencies observed from 10 to 40 mHz. We compare our results with the timing and spectral correlatio…