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Probing the Outflowing Multiphase Gas ∼1 kpc below the Galactic Center
Hernandez, Svea; Savage, Blair D.; Bland-Hawthorn, Joss +8 more
Comparison of interstellar medium (ISM) absorption in the UV spectrum of LS 4825, a B1 Ib-II star d = 21 ± 5 kpc from the Sun toward l = 1.°67 and b = -6.°63, with ISM absorption toward an aligned foreground star at d < 7.0 ± 1.7 kpc, allows us to isolate and study gas associated with the Milky Way nuclear wind. Spectra from the Space Telescope…
Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping
Passot, T.; Sahraoui, F.; Henri, P. +5 more
Three-dimensional nonlinear finite Larmor radius (FLR)-Landau fluid simulations, which include some small-scale ({k}\perp {ρ }I≳ 1) kinetic effects, are performed to explore the nature of the sub-ion scale turbulence in the solar wind and to investigate the role of Landau damping and FLR corrections. The resulting steady-stat…
Magnetohydrodynamic Simulations for Studying Solar Flare Trigger Mechanism
Kusano, K.; Shiota, D.; Inoue, S. +1 more
In order to understand the flare trigger mechanism, we conduct three-dimensional magnetohydrodynamic simulations using a coronal magnetic field model derived from data observed by the Hinode satellite. Several types of magnetic bipoles are imposed into the photospheric boundary of the Nonlinear Force-free Field model of Active Region (AR) NOAA 109…
Relieving tensions related to the lensing of the cosmic microwave background temperature power spectra
Couchot, F.; Henrot-Versillé, S.; Perdereau, O. +4 more
The angular power spectra of the cosmic microwave background (CMB) temperature anisotropies reconstructed from Planck data seem to present "too much" gravitational lensing distortion. This is quantified by the control parameter AL that should be compatible with unity for a standard cosmology. With the class Boltzmann solver and the prof…
Discovery of the First Quadruple Gravitationally Lensed Quasar Candidate with Pan-STARRS
Keeton, C. R.; Berghea, C. T.; Dudik, R. P. +2 more
We report the serendipitous discovery of the first gravitationally lensed quasar candidate from Pan-STARRS. The grizy images reveal four point-like images with magnitudes between 14.9 and 18.1 mag. The colors of the point sources are similar, and they are more consistent with quasars than with stars or galaxies. The lensing galaxy is detected in t…
ALMA constraints on star-forming gas in a prototypical z = 1.5 clumpy galaxy: the dearth of CO(5-4) emission from UV-bright clumps
Daddi, E.; Elbaz, D.; Rujopakarn, W. +13 more
We present deep ALMA CO(5-4) observations of a main-sequence, clumpy galaxy at z = 1.5 in the HUDF. Thanks to the ∼0{^''.}5 resolution of the ALMA data, we can link stellar population properties to the CO(5-4) emission on scales of a few kiloparsec. We detect strong CO(5-4) emission from the nuclear region of the galaxy, consistent with…
Gaia eclipsing binary and multiple systems. Two-Gaussian models applied to OGLE-III eclipsing binary light curves in the Large Magellanic Cloud
Audard, M.; Rimoldini, L.; Holl, B. +11 more
Context. The advent of large scale multi-epoch surveys raises the need for automated light curve (LC) processing. This is particularly true for eclipsing binaries (EBs), which form one of the most populated types of variable objects. The Gaia mission, launched at the end of 2013, is expected to detect of the order of few million EBs over a five-ye…
Global Energetics of Solar Flares. VI. Refined Energetics of Coronal Mass Ejections
Aschwanden, Markus J.
In this study, we refine the coronal mass ejection (CME) model that was presented in an earlier study of the global energetics of solar flares and associated CMEs and apply it to all (860) GOES M- and X-class flare events observed during the first seven years (2010-2016) of the Solar Dynamics Observatory (SDO) mission. The model refinements includ…
Scattering Properties of the Venusian Clouds Observed by the UV Imager on board Akatsuki
Yamada, M.; Imamura, T.; Murakami, S. +6 more
We analyze the albedo of Venus obtained from the UV Imager on board Akatsuki. A relative global mean albedo over phase angle is used in this study, and we confirm the glory feature at 283 and 365 nm in the data acquired in 2016 May. We successfully simulate the observation using a radiative transfer model. Our results show that cloud aerosols of {…
Alignments of parity even/odd-only multipoles in CMB
Aluri, Pavan K.; Ralston, John P.; Weltman, Amanda
We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from Planck full mission temperature measurements. An excess power in odd multipoles compared to even multipoles has previously been found on large angular scales. Motivated by this apparent parity asymmetry, we evaluate directional statistics …