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Witnessing a merging bullet being stripped in the galaxy cluster RXCJ2359.3-6042
Böhringer, Hans; Chon, Gayoung
We report the discovery of the merging cluster, RXCJ2359.3-6042, from the REFLEX II cluster survey and present our results from all three detectors combined in the imaging and spectral analysis of the XMM-Newton data. Also known as Abell 4067, this is a unique system, where a compact bullet penetrates an extended, low density cluster at redshift z…
Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper Belt analogue around HD 131511.
Kennedy, G. M.
A key discovery of the Kepler mission is of the circumbinary planets known as `Tatooines', which appear to be well aligned with their host stars' orbits. Whether this alignment is due to initially coplanar circumbinary planet-forming discs (i.e. nature), or subsequent alignment of initially misaligned discs by warping the inner disc or torquing th…
Herschel HIFI observations of the Sgr A +50 km s-1 Cloud. Deep searches for O2 in emission and foreground absorption
Liseau, R.; Roueff, E.; Pagani, L. +8 more
Context. The Herschel Oxygen Project (HOP) is an open time key program, awarded 140 h of observing time to search for molecular oxygen (O2) in a number of interstellar sources. To date O2 has definitely been detected in only two sources, namely ρ Oph A and Orion, reflecting the extremely low abundance of O2 in the …
Mid-infrared luminosity function of local star-forming galaxies in the North Ecliptic Pole-Wide survey field of AKARI
Goto, Tomotsugu; Kim, Seong Jin; Im, Myungshin +6 more
We present mid-infrared (MIR) luminosity functions (LFs) of local (z < 0.3) star-forming (SF) galaxies in the AKARI's North Ecliptic Pole (NEP)-Wide survey field. In order to derive more accurate LF, we used spectroscopic sample only. Based on the NEP-Wide point source catalogue containing a large number of infrared (IR) sources distributed ove…
Spectral comparison and stability of red regions on Jupiter
Simon, Amy A.; Sanchez-Lavega, Agustin; Legarreta, Jon +4 more
A rare red cyclone visible on Jupiter in 1994 and 1995 falls in a class of vortices that are intensely colored, yet low altitude, unlike the Great Red Spot (GRS). Dynamical modeling indicates that the presence of nearby anticyclones both aids in formation and lead to the destruction of the cyclone. A study of absolute spectral reflectance from Hub…
The CoRoT chemical peculiar target star HD 49310
Paunzen, E.; Weiss, W. W.; Fröhlich, H. -E. +2 more
Context. The magnetic chemically peculiar (CP) stars of the upper main sequence are well-suited laboratories for investigating the influence of local magnetic fields on the stellar surface because they produce inhomogeneities (spots) that can be investigated in detail as the star rotates.
Aims: We studied the inhomogeneous surface structure o…
Non-elliptic wavevector anisotropy for magnetohydrodynamic turbulence
Narita, Y.
A model of non-elliptic wavevector anisotropy is developed for the inertial-range spectrum of magnetohydrodynamic turbulence and is presented in the two-dimensional wavevector domain spanning the directions parallel and perpendicular to the mean magnetic field.
The non-elliptic model is a variation of the elliptic model with different sca…
Probabilistic constraints from existing and future radar imaging on volcanic activity on Venus
Lorenz, Ralph D.
We explore the quantitative limits that may be placed on Venus' present-day volcanic activity by radar imaging of surface landforms. The apparent nondetection of new lava flows in the areas observed twice by Magellan suggests that there is a ~60% chance that the eruption rate is ~1 km3/yr or less, using the eruption history and area/vol…
Identification of the dominant ULF wave mode and generation mechanism for obliquely propagating waves in the Earth's foreshock
Stasiewicz, K.; Grzesiak, M.; Karimabadi, H. +3 more
We discuss mechanisms of the generation of ultralow frequency (ULF) upstream waves in the terrestrial foreshock that are essential for the acceleration of ions in space plasmas. The analysis is based on global hybrid kinetic simulations of the magnetosphere that provide realistic environment for the growth of the ULF waves in a quasi-radial config…
Constraints to the magnetospheric properties of T Tauri stars - II. The Mg II ultraviolet feature
López-Martínez, Fatima; Gómez de Castro, Ana Inés
The atmospheric structure of T Tauri stars (TTSs) and its connection with the large-scale outflow is poorly known. Neither the effect of the magnetically mediated interaction between the star and the disc is well understood. The Mg ii multiplet is a fundamental tracer of TTSs atmospheres and outflows, and is the strongest feature in the near-ultra…