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Recombining plasma in supernova remnants: Discovery and progress in the last decade
Yamaguchi, Hiroya
Presence of recombining (overionized) plasma in several supernova remnants (SNRs), first suggested by ASCA observations, was anchored by the detection of enhanced radiative recombination continua in Suzaku spectra of the SNRs IC 443 and W49B. This discovery was surprising, because X‑ray‑emitting SNRs were thought to have ionizing plasmas in genera…
Kinematics of main-sequence stars from the Gaia DR2 and PMA proper motions
Akhmetov, V. S.; Fedorov, P. N.; Velichko, Anna B.
We aim at analysis of kinematics of main-sequence stars from the GaiaDR2 and PMA catalogues as well as comparison of kinematic parameters derived from their proper motions. We decompose the stellar velocity field on to a set of vector spherical harmonics (VSH), and, using the relations between the decomposition coefficients and the Ogorodnikov-Mil…
AStroLens: automatic strong-lens modelling of X-ray selected galaxy clusters
Ebeling, Harald; Zalesky, Lukas
We use AStroLens, a newly developed gravitational lens-modelling code that relies only on geometric and photometric information of cluster galaxies as input, to map the strong-lensing regions and estimate the lensing strength of 96 galaxy clusters at z = 0.5-0.9. All clusters were identified during the extended Massive Cluster Survey (eMACS) based…
A Swift view of X-ray and UV radiation in the planet-forming T Tauri system PDS 70
Güdel, Manuel; Pye, John P.; Page, Kim L. +4 more
PDS 70 is a ∼5-Myr-old star with a gas and dust disc in which several protoplanets have been discovered. We present the first ultraviolet (UV) detection of the system along with X-ray observations taken with the Neil Gehrels Swift Observatory satellite. PDS 70 has an X-ray flux of 3.4 × 10-13 erg cm-2 s-1 in the 0.…
The LASCO Coronal Brightness Index
Howard, Russell A.; Battams, Karl; Lean, Judith L. +2 more
We present the construction of a new white-light coronal brightness index (CBI) from the entire archive of observations recorded by the Large Angle Spectrometric Coronagraph (LASCO) C2 camera between 1996 and 2017, comprising two full solar cycles. We reduce all fully calibrated daily C2 observations of the white-light corona into a single daily c…
Open-Source Software Analysis Tool to Investigate Space Plasma Turbulence and Nonlinear DYNamics (ODYN)
Echim, M. M.; Teodorescu, E.
We have designed and built a versatile modularized software library—ODYN—that wraps a comprehensive set of advanced data analysis methods meant to facilitate the study of turbulence, nonlinear dynamics, and complexity in space plasmas. The Python programming language is used for the algorithmic implementation of models and methods devised to under…
Wind retrieval from temperature measurements from the Rover Environmental Monitoring Station/Mars Science Laboratory
Zorzano, María-Paz; Martín-Torres, Javier; Soria-Salinas, Álvaro +1 more
This work presents a novel method for the real-time retrieval of wind speed on the surface of Mars that uses temperature measurements from the Rover Environmental Monitoring Station (REMS) instrument onboard the Curiosity rover of the Mars Science Laboratory (MSL) mission. After final failure of the Wind Sensor (WS) in sol 1491, REMS has not been …
A Framework for Relative Biosignature Yields from Future Direct Imaging Missions
Tuchow, Noah W.; Wright, Jason T.
Future exoplanet direct imaging missions, such as HabEx and LUVOIR, will select target stars to maximize the number of Earth-like exoplanets that can have their atmospheric compositions characterized. Because one of these missions' aims is to detect biosignatures, they should also consider the expected biosignature yield of planets around these st…
Predicted Masses of Galactic Cepheids in the Gaia Data Release 2
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +4 more
On the basis of recently computed nonlinear convective pulsation models of Galactic Cepheids, spanning wide ranges of input stellar parameters, we derive theoretical mass-dependent Period-Wesenheit relations in the Gaia bands, namely, G, GBP, and GBR, that are found to be almost independent of the assumed efficiency of supera…
Structural parameters for the globular-cluster-like objects in NGC 1052-DF2
Zou, Hu; Nie, Jundan; Zhang, Tianmeng +8 more
Recently, van Dokkum et al. have found an ultra-diffuse galaxy NGC 1052-DF2 with little or no dark matter, based on a spectroscopic study of its 11 constituent globular-cluster-like objects. In this paper, we analyse these 11 objects using Hubble Space Telescope imaging. We derive the structural parameters for each object by fitting the surface br…