Search Publications
Viscoelastic Tides of Mercury and the Determination of its Inner Core Size
Oberst, J.; Stark, A.; Steinbrügge, G. +3 more
We computed interior structure models of Mercury and analyzed their viscoelastic tidal response. The models are consistent with MErcury Surface, Space Environment, GEochemistry, and Ranging mission inferences of mean density, mean moment of inertia, moment of inertia of mantle and crust, and tidal Love number k2. Based on these constrai…
Nowcasting Solar Energetic Particle Events Using Principal Component Analysis
Vainio, R.; Valtonen, E.; Papaioannou, A. +7 more
We perform a principal component analysis (PCA) on a set of six solar variables (i.e. width/size (s ) and velocity (u ) of a coronal mass ejection, logarithm of the solar flare (SF) magnitude (logSXRs ), SF longitude (lon ), duration (DT ), and rise time (RT )). We classify the solar energetic particle (SEP) event radiation impact (in terms of the…
Probing the sign-changeable interaction between dark energy and dark matter with current observations
Zhang, Jing-Fei; Zhang, Xin; Li, Yun-He +2 more
We consider the models of vacuum energy interacting with cold dark matter in this study, in which the coupling can change sigh during the cosmological evolution. We parameterize the running coupling b by the form b(a) = b0a+be(1‑a), where at the early-time the coupling is given by a constant be and today the coupli…
SEAGLE - I. A pipeline for simulating and modelling strong lenses from cosmological hydrodynamic simulations
Crain, Robert A.; Schaye, Joop; Theuns, Tom +8 more
In this paper we introduce the SEAGLE (i.e. Simulating EAGLE LEnses) programme, which approaches the study of galaxy formation through strong gravitational lensing, using a suite of high-resolution hydrodynamic simulations, Evolution and Assembly of GaLaxies and their Environments (EAGLE) project. We introduce the simulation and analysis pipeline …
Prospects for Backtracing 1I/‘Oumuamua and Future Interstellar Objects
Zhang, Qicheng
1I/‘Oumuamua is the first of likely many small bodies of extrasolar origin to be found in the solar system. These interstellar objects (ISOs) are hypothesized to have formed in extrasolar planetary systems prior to being ejected into interstellar space and subsequently arriving at the solar system. This paper discusses necessary considerations for…
Transformation of HST WFC3/UVIS Filters to the Standard BVI System
Harris, William E.
Empirical transformations of selected broadband filters in the Hubble Space Telescope Wide Field Camera 3 (WFC3)/UVIS camera into the BVI system are derived. These conversions employ photometry of stars in a standard field in the globular cluster 47 Tucanae that has repeatedly been imaged with both the WFC3 and Advanced Camera for Surveys (ACS) ca…
The H 0 Tension in Non-flat QCDM Cosmology
Huang, Zhiqi; Miao, Haitao
The recent local measurement of the Hubble constant leads to a more than 3σ tension with Planck + ΛCDM. In this article we study the H 0 tension in non-flat QCDM cosmology, where Q stands for a minimally coupled and slowly or moderately rolling quintessence field ϕ with a smooth potential V(φ ), and CDM refers to cold dark matter. By ge…
ALMA detects a radial disk wind in DG Tauri
Audard, M.; Güdel, M.; Vorobyov, E. +7 more
Aims: We aim to use the high spatial resolution of the Atacama Large Millimeter/submillimeter Array (ALMA) to map the flow pattern of molecular gas near DG Tauri and its disk, a young stellar object driving a jet and a molecular outflow.
Methods: We use observations from ALMA in the J = 2 - 1 transition of 12CO, 13C…
SALT HRS Discovery of the Binary Nucleus of the Etched Hourglass Nebula MyCn 18
Miszalski, Brent; Manick, Rajeev; Iłkiewicz, Krystian +2 more
The shaping of various morphological features of planetary nebulae is increasingly linked to the role of binary central stars. Identifying a binary within a planetary nebula offers a powerful tool with which to directly investigate the formation mechanisms behind these features. The Etched Hourglass Nebula, MyCn 18, is the archetype for several bi…
Evolution of the Stellar Mass-Metallicity Relation. I. Galaxies in the z ∼ 0.4 Cluster Cl0024
Treu, Tommaso; Ellis, Richard S.; Moran, Sean M. +2 more
We present the stellar mass-stellar metallicity relationship (MZR) in the galaxy cluster Cl0024+1654 at z ∼ 0.4 using full-spectrum stellar population synthesis modeling of individual quiescent galaxies. The lower limit of our stellar mass range is M * = 109.7 M ⊙, the lowest galaxy mass at which individual stellar…