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Oxygen impacts on dipolarization fronts and reconnection rate
Lapenta, Giovanni; Walker, Raymond J.; Ashour-Abdalla, Maha +1 more
Spacecraft observations near a magnetotail X line show that oxygen (O+) ions are minor species during nonstorm substorms, but they can become major species during some of the storm time substorms. Dipolarization fronts (DFs), which are characterized by a sharp increase northward magnetic field in the magnetotail, are commonly observed d…
Far Infrared Variability of Sagittarius A*: 25.5 hr of Monitoring with Herschel
Heinke, C. O.; Dowell, C. D.; Schulz, B. +3 more
Variable emission from Sgr A*, the luminous counterpart to the super-massive black hole at the center of our Galaxy, arises from the innermost portions of the accretion flow. Better characterization of the variability is important for constraining models of the low-luminosity accretion mode powering Sgr A*, and could further our ability to use var…
New Debris Disks in Nearby Young Moving Groups
Ábrahám, P.; Kóspál, Á.; Henning, Th. +5 more
A significant fraction of nearby young moving group members harbor circumstellar debris dust disks. Due to their proximity and youth, these disks are attractive targets for studying the early evolution of debris dust and planetesimal belts. Here we present 70 and 160 µm observations of 31 systems in the β Pic moving group, and in the Tucana-…
Eridania Basin: An ancient paleolake floor as the next landing site for the Mars 2020 rover
Pajola, Maurizio; Carter, John; Pozzobon, Riccardo +5 more
The search for traces of past Martian life is directly connected to ancient paleolakes, where ponding water or low-energy water fluxes were present for long time intervals. The Eridania paleolakes system, located along the 180° meridian, is one of the largest lacustrine environments that were once present on Mars. Morphological features suggest th…
Catching jetted tidal disruption events early in millimetre
Yuan, Qiang; Wang, Q. Daniel; Zhang, Bing +2 more
Relativistic jets can form from at least some tidal disruption events (TDEs) of (sub-)stellar objects around supermassive black holes. We detect the millimetre (MM) emission of IGR J12580+0134 - the nearest TDE known in the galaxy NGC 4845 at the distance of only 17 Mpc, based on Planck all-sky survey data. The data show significant flux jumps aft…
Distinguishing disks from mergers: Tracing the kinematic asymmetries in local (U)LIRGs using kinemetry-based criteria
Arribas, Santiago; Colina, Luis; Bellocchi, Enrica
Context. The kinematic characterization of different galaxy populations is a key observational input for distinguishing between different galaxy evolutionary scenarios because it helps to determine the number ratio of rotating disks to mergers at different cosmic epochs. Local (ultra) luminous infrared galaxies ((U)LIRGs) cover similar range of st…
To v∞ and beyond! The He I absorption variability across the 2014.6 periastron passage of η Carinae
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +11 more
We have monitored the massive binary star η Carinae with the CTIO/Small and Moderate Aperture Research Telescope System 1.5 m telescope and CHIRON spectrograph from the previous apastron passage of the system through the recent 2014.6 periastron passage. Our monitoring has resulted in a large, homogeneous data set with an unprecedented time-sampli…
Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +2 more
We consider an inhomogeneous model and independently an anisotropic model of primordial power spectrum in order to describe the observed hemispherical anisotropy in cosmic microwave background radiation (CMBR). This anisotropy can be parametrized in terms of the dipole modulation model of the temperature field. Both the models lead to correlations…
Determining Type Ia Supernova Host Galaxy Extinction Probabilities and a Statistical Approach to Estimating the Absorption-to-reddening Ratio RV
Marleau, Francine; Deustua, Susana; Cikota, Aleksandar
We investigate limits on the extinction values of Type Ia supernovae (SNe Ia) to statistically determine the most probable color excess, E(B - V), with galactocentric distance, and use these statistics to determine the absorption-to-reddening ratio, RV, for dust in the host galaxies. We determined pixel-based dust mass surface density m…
The Circum-Galactic Medium of MASsive Spirals. I. An Overview and a Case Study of NGC 5908
Bregman, Joel N.; Anderson, Michael E.; Crain, Robert A. +2 more
The Circum-Galactic Medium of MASsive Spirals is a project studying the overall content, physical and chemical properties, and spatial distributions of the multi-phase circumgalactic medium around a small sample of the most massive ({M}* ≳ 2× {10}11 {M}⊙ , {v}{rot}\gt 300 {km} {{{s}}}-1) isola…