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Turbulence in the near-Venusian space: Venus Express observations
Zhang, TieLong; Xiao, SuDong; Wu, MingYu +3 more
Velocity-inverted Three-dimensional Distribution of the Gas Clouds in the Type 2 AGN NGC 1068
Kishimoto, Makoto; Miyauchi, Ryuji
Spatially resolved velocity maps at high resolutions of 1-10 pc are becoming available for many nearby active galactic nuclei (AGNs) in both optical/infrared atomic emission lines and submillimeter molecular lines. For the former, it is known that a linear relationship appears to exist between the velocity of the ionized gas clouds and the distanc…
Evidence for radially independent size growth of early-type galaxies in clusters
Andreon, S.
It is not well understood whether the growth of early-type cluster galaxies proceeds inside-out, outside-in, or at the same pace at all radii. In this work we measured the galaxy size, defined by the radius including 80% of the galaxy light, non-parametrically. We also determined a non-parametric estimate of galaxy light concentration, which measu…
The effect of pulsation on the near-ultraviolet spectrum of AGB stars
Guerrero, Martín A.; Ortiz, Roberto
Pulsating and non-pulsating asymptotic giant branch (AGB) stars exhibit a variable near-ultraviolet (near-UV) spectrum, which suggest that mechanisms other than pulsation may affect their near-UV spectrum. In this work, we analyse the near-UV spectra of two groups of AGB stars: (1) regularly pulsating and (2) irregular, small-amplitude stars. Near…
Plasma Density and Magnetic Field Fluctuations in the Ion Gyro-Frequency Range Near the Diamagnetic Cavity of Comet 67P
Nilsson, H.; André, M.; Vaivads, A. +8 more
We report the detection of large-amplitude, quasi-harmonic density fluctuations with associated magnetic field oscillations in the region surrounding the diamagnetic cavity of comet 67P. Typical frequencies are ∼0.1 Hz, corresponding to ∼10 times the water and ≲ 0.5 times the proton gyro-frequencies, respectively. Magnetic field oscillations are n…
HiFLEx—A Highly Flexible Package to Reduce Cross-dispersed Echelle Spectra
Anglada-Escudé, Guillem; Sithajan, Sirinrat; Feng, Fabo +8 more
We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any pre-knowledge about the form or position of the echelle-orders. It has been tested on cross-dispersed echelle spectrographs between…
A multi-diagnostic spectral analysis of penumbral microjets
Rouppe van der Voort, Luc; Drews, Ainar
Context. Penumbral microjets (PMJs) are short-lived, jet-like objects found in the penumbra of sunspots. They were first discovered in chromospheric lines and have later also been shown to exhibit signals in transition region (TR) lines. Their origin and manner of evolution is not yet settled.
Aims: We perform a comprehensive analysis of PMJs…
On extreme space weather events: Solar eruptions, energetic protons and geomagnetic storms
Miteva, Rositsa
The purpose of this study is to identify the extreme space weather events in the available satellite and ground-based databases and to relate them to other associated or accompanied solar activity events. Solar flares, coronal mass ejections, energetic protons and geomagnetic storms are selected among all manifestations/consequences of solar activ…
Diverse Polygonal Patterned Grounds in the Northern Eridania Basin, Mars: Possible Origins and Implications
Xiao, Long; Xu, Yi; Zhao, Jiannan +4 more
Diverse polygonal patterned grounds are found to occur in the Eridania basin system (a set of connecting irregular-shaped depressions interpreted as a paleolake basin system) located in the martian highland region between Terra Cimmeria and Sirenum. We here use multiple sets of imagery to document diverse polygonal patterned grounds in the fluvio-…
H-He collision-induced satellite in the Lyman α profile of DBA white dwarf stars
Xu, Siyi; Hubeny, Ivan; Kielkopf, John F. +6 more
The spectra of helium-dominated white dwarf stars with hydrogen in their atmosphere present a distinctive broad feature centred around 1160 Å in the blue wing of the Lyman α line. It is extremely apparent in WD 1425+540 recently observed with Hubble Space Telescope(HST) Cosmic Origins Spectrograph (COS). With new theoretical line profiles based on…