Search Publications
A Two-sided Loop X-Ray Solar Coronal Jet Driven by a Minifilament Eruption
Harra, Louise K.; Moore, Ronald L.; Sterling, Alphonse C. +1 more
Most of the commonly discussed solar coronal jets are the type that consist of a single spire extending approximately vertically from near the solar surface into the corona. Recent research supports that eruption of a miniature filament (minifilament) drives many such single-spire jets and concurrently generates a miniflare at the eruption site. A…
IFU investigation of possible Lyman continuum escape from Mrk 71/NGC 2366
Östlin, Göran; Roth, Martin M.; Micheva, Genoveva +2 more
Context. Mrk 71/NGC 2366 is the closest green pea (GP) analog and candidate Lyman Continuum (LyC) emitter. Recently, 11 LyC-leaking GPs have been detected through direct observations of the ionizing continuum, making this the most abundant class of confirmed LyC-emitters at any redshift. High resolution, multiwavelength studies of GPs can lead to …
Joint X-Ray, EUV, and UV Observations of a Small Microflare
Krucker, Säm; White, Stephen M.; Grefenstette, Brian W. +5 more
We present the first joint observation of a small microflare in X-rays with the Nuclear Spectroscopic Telescope ARray (NuSTAR), in UV with the Interface Region Imaging Spectrograph (IRIS), and in EUV with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA). These combined observations allow us to study the hot coronal and cooler …
CHANG-ES. XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631
Beck, Rainer; Kamieneski, Patrick; Irwin, Judith +13 more
Aims: NGC 4631 is an interacting galaxy that exhibits one of the largest, gaseous halos observed among edge-on galaxies. We aim to examine the synchrotron and cosmic-ray propagation properties of its disk and halo emission with new radio continuum data.
Methods: Radio continuum observations of NGC 4631 were performed with the Karl G. Jan…
Light dark matter from leptogenesis
Falkowski, Adam; Kuflik, Eric; Levi, Noam +1 more
We consider the implications of a shared production mechanism between the baryon asymmetry of the universe and the relic abundance of dark matter, that does not result in matching asymmetries. We present a simple model within a two sector leptogenesis framework, in which right handed sterile neutrinos decay out of equilibrium to both the standard …
Detection and characterization of an ultra-dense sub-Neptunian planet orbiting the Sun-like star K2-292
Alonso, R.; Deeg, H.; Erikson, A. +51 more
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M⋆ = 1.00 ± 0.03 M⊙ and R⋆ = 1.09 ± 0.03 R⊙…
Mapping the stability of stellar rotating spheres via linear response theory
Pichon, C.; Heggie, D. C.; Varri, A. L. +3 more
Rotation is ubiquitous in the Universe, and recent kinematic surveys have shown that early-type galaxies and globular clusters are no exception. Yet the linear response of spheroidal rotating stellar systems has seldom been studied. This paper takes a step in this direction by considering the behaviour of spherically symmetric systems with differe…
The tilt of the velocity ellipsoid in the Milky Way with Gaia DR2
Helmi, A.; de Zeeuw, P. T.; Posti, L. +1 more
The velocity distribution of stars is a sensitive probe of the gravitational potential of the Galaxy, and hence of its dark matter distribution. In particular, the shape of the dark halo (e.g. spherical, oblate, or prolate) determines velocity correlations, and different halo geometries are expected to result in measurable differences. Here we exp…
Kinematics of the O VI Circumgalactic Medium: Halo Mass Dependence and Outflow Signatures
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
We probe the high-ionization circumgalactic medium by examining absorber kinematics, absorber-galaxy kinematics, and average absorption profiles of 31 O VI absorbers from the “Multiphase Galaxy Halos” Survey as a function of halo mass, redshift, inclination, and azimuthal angle. The galaxies are isolated at 0.12 < z gal < 0.66 and…
Inversion of asteroid photometry from Gaia DR2 and the Lowell Observatory photometric database
Hanuš, J.; Ďurech, J.; Vančo, R.
Context. Rotation properties (spin-axis direction and rotation period) and coarse shape models of asteroids can be reconstructed from their disk-integrated brightness when measured from various viewing geometries. These physical properties are essential for creating a global picture of structure and dynamical evolution of the main belt.
Aims:…