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Effects from dayside magnetosphere to distant tail unleashed by a bifurcated, non-reconnecting interplanetary current sheet
Berchem, J.; Wing, S.; Farrugia, C. J. +6 more
Global magnetospheric effects resulting from the passage at Earth of large-scale structures have been well studied. The effects of common and short-term features, such as discontinuities and current sheets (CSs), have not been studied in the same depth. Herein we show how a seemingly unremarkable interplanetary feature can cause widespread effects…
Gas inflows in the polar ring of NGC 4111: the birth of an AGN
Lützgendorf, Nora; Ma, Chung-Pei; Gebhardt, Karl +14 more
We have used Hubble Space Telescope (HST) images, SAURON Integral Field Spectroscopy (IFS), and adaptative optics assisted Gemini NIFS near-infrared K-band IFS to map the stellar and gas distribution, excitation and kinematics of the inner few kpc of the nearby edge-on S0 galaxy NGC 4111. The HST images map its ≈450 pc diameter dusty polar ring, w…
Interaction of convective plasma and small-scale magnetic fields in the lower solar atmosphere
Utz, Dominik; Vargas Domínguez, Santiago
In the following short review we will outline some of the possible interaction processes of lower solar atmospheric plasma with the embedded small-scale solar magnetic fields. After introducing the topic, important types of small-scale solar magnetic field elements are outlined to then focus on their creation and evolution, and finally end up desc…
YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) - II. Using self-organizing maps to explore young star variability in sectors 1-13 of TESS data
Armstrong, David J.; Pollacco, Don; Battley, Matthew P.
Young exoplanets and their corresponding host stars are fascinating laboratories for constraining the time-scale of planetary evolution and planet-star interactions. However, because young stars are typically much more active than the older population, in order to discover more young exoplanets, greater knowledge of the wide array of young star va…
Revisiting the Circumnuclear X-Ray Emission of NGC 2992 in a Historically Low State
Wang, Junfeng; Xu, Xiaoyu
The innermost region of the Seyfert galaxy NGC 2992 has long been suspected to be the location of intense AGN-host galaxy interaction, but photon pile up in previous high-resolution observations hampered the study of the soft X-ray excess and the interaction near its nucleus. We present an X-ray imaging and spectroscopic analysis of the circumnucl…
IFU observations of the inner 200 pc of NGC 4546: gas rotation, non-circular motions, and ionized outflows
Riffel, Rogemar A.; Heckler, Kelly F.; Ricci, Tiago V.
We present a detailed analysis of the ionized gas distribution and kinematics in the inner ~ 200 pc of NGC 4546, host of a low-luminosity active galactic nucleus (LLAGN). Using GMOS-IFU observations, with a spectral coverage of 4736-6806 Å and an angular resolution of 0.7 arcsec, we confirm that the nuclear emission is consistent with photoionizat…
The Solar Orbiter EUI instrument: The Extreme Ultraviolet Imager (Corrigendum)
Vial, J. -C.; Zhang, X.; Peter, H. +146 more
Can Turbulent, High-density Gas Form Stars in Molecular Clouds: A Case Study in Ophiuchus
Tsai, Chao-Wei; Lin, Yuxin; Wu, Jingwen +3 more
Star formation is governed by the interplay between gravity and turbulence in most of molecular clouds. Recent theoretical works assume that dense gas, whose column density is above a critical value in the column density probability distribution function (N-PDF), where gravity starts to overcome turbulence, becomes star-forming gas and will collap…
Numerical Modeling of Suprathermal Electron Transport in the Solar Wind: Effects of Whistler Turbulence with a Full Diffusion Tensor
Zank, Gary P.; Tang, Bofeng; Kolobov, Vladimir I.
The electron VDF in the solar wind consists of a Maxwellian core, a suprathermal halo, a field-aligned component strahl, and an energetic superhalo that deviates from the equilibrium. Whistler wave turbulence is thought to resonantly scatter the observed electron velocity distribution. Wave-particle interactions that contribute to Whistler wave tu…
ACCESS: Tentative Detection of H2O in the Ground-based Optical Transmission Spectrum of the Low-density Hot Saturn HATS-5b
Kirk, James; López-Morales, Mercedes; Jordán, Andrés +13 more
We present a precise ground-based optical transmission spectrum of the hot Saturn HATS-5b (T eq = 1025 K), obtained as part of the ACCESS survey with the IMACS multi-object spectrograph mounted on the Magellan Baade Telescope. Our spectra cover the 0.5-0.9 µm region and are the product of five individual transits observed between …