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Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions
Cao, Wenda; Nóbrega-Siverio, Daniel; Li, Dong +5 more
Dynamical jets are generally found on light bridges (LBs), which are key to studying sunspot decay. So far, their formation mechanism is not fully understood. In this paper, we used state-of-the-art observations from the Goode Solar Telescope, the Interface Region Imaging Spectrograph, the Spectro-polarimeter on board Hinode, and the Atmospheric I…
Dust properties in the cold and hot gas phases of the ATLAS3D early-type galaxies as revealed by AKARI
Kaneda, H.; Murata, K.; Yamagishi, M. +6 more
Context. The properties of the dust in the cold and hot gas phases of early-type galaxies (ETGs) are key to understanding ETG evolution.
Aims: We aim to conduct a systematic study of the dust in a large sample of local ETGs, focusing on relations between the dust and the molecular, atomic, and X-ray gas of the galaxies, as well as their envir…
Are Solar Energetic Particle Events and Type II Bursts Associated with Fast and Narrow Coronal Mass Ejections?
Gopalswamy, N.; Kahler, S. W.; Ling, A. G.
Gradual solar energetic (E >10 MeV) particle (SEP) events and metric through kilometric wavelength type II radio bursts are usually associated with shocks driven by fast (V ≥900 kms−1) and wide (W ≥60∘) coronal mass ejections (FW CMEs). This criterion was established empirically by several studies from solar cycle 23. The …
Discovery of a pulsar-powered bow shock nebula in the Small Magellanic Cloud supernova remnant DEM S5
Haberl, F.; Filipović, M. D.; Kothes, R. +32 more
We report the discovery of a new Small Magellanic Cloud pulsar wind nebula (PWN) at the edge of the supernova remnant (SNR) DEM S5. The pulsar powered object has a cometary morphology similar to the Galactic PWN analogues PSR B1951+32 and `the mouse'. It is travelling supersonically through the interstellar medium. We estimate the pulsar kick velo…
Suprathermal Ion Backgrounds of Solar Energetic Particle Events
Kahler, S. W.; Ling, A. G.
Gradual solar energetic particle (SEP) events result from the acceleration of low-energy suprathermal seed particles to high (E > 10 MeV nuc-1) energies by shocks driven by coronal mass ejections (CMEs). Several studies suggest connections between suprathermal particles measured in situ at 1 au and the seed particles accelerated near…
A Long-duration Luminous Type IIn Supernova KISS15s: Strong Recombination Lines from the Inhomogeneous Ejecta-CSM Interaction Region and Hot Dust Emission from Newly Formed Dust
Tominaga, Nozomu; Yoachim, Peter; Ivezić, Željko +7 more
We report the discovery of an SN 1988Z-like type IIn supernova KISS15s found in a low-mass star-forming galaxy at redshift z = 0.038 during the course of the Kiso Supernova Survey (KISS). KISS15s shows long-duration optical continuum and emission line light curves, indicating that KISS15s is powered by a continuous interaction between the expandin…
J-PLUS: A wide-field multi-band study of the M 15 globular cluster. Evidence of multiple stellar populations in the RGB
Cortesi, Arianna; Chies-Santos, Ana L.; Mendes de Oliveira, Claudia +21 more
Context. As a consequence of internal and external dynamical processes, Galactic globular clusters (GCs) have properties that vary radially. Wide-field observations covering the entire projected area of GCs out to their tidal radii (rtidal) can therefore give crucial information on these important relics of the Milky Way formation era. …
Electron Density Profiles in the Upper Ionosphere of Mars From 11 Years of MARSIS Data: Variability Due to Seasons, Solar Cycle, and Crustal Magnetic Fields
Gurnett, D. A.; Morgan, D. D.; Halekas, J. +3 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding on board the Mars Express spacecraft measures the frequency of local plasma oscillations, which can be used to determine electron densities local to the spacecraft. This paper provides an overview of electron densities in the upper Martian ionosphere, obtained by investigating over 400…
Exploring the innermost dust formation region of the oxygen-rich AGB star IK Tauri with VLT/SPHERE-ZIMPOL and VLTI/AMBER
Ohnaka, K.; Adam, C.
Context. Low- and intermediate-mass stars on the asymptotic giant branch (AGB) are known to be prevalent dust providers to galaxies, replenishing the surrounding medium with molecules and dust grains. However, the mechanisms responsible for the formation and acceleration of dust in the cool extended atmospheres of AGB stars are still open to debat…
Modeled Subglacial Water Flow Routing Supports Localized Intrusive Heating as a Possible Cause of Basal Melting of Mars' South Polar Ice Cap
Butcher, F. E. G.; Balme, M. R.; Conway, S. J. +1 more
The discovery of an 20-km-wide area of bright subsurface radar reflections, interpreted as liquid water, beneath the Martian south polar layered deposits (SPLD) in data from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument, and the discovery of two geologically recent potential eskers (landforms produced by subgla…