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X-Ray Spectroscopy in the Microcalorimeter Era. II. A New Diagnostic on Column Density from the Case A to B Transition in H- and He-like Iron
Ferland, G. J.; Su, Y.; Chakraborty, P. +2 more
The Soft X-ray Spectrometer on board Hitomi, with the unprecedented resolving power of R ∼ 1250, allowed the detection of members of the Fe XXV Kα complex emission spectra from the center of the Perseus Cluster. In this paper, we introduce a novel method of measuring the column density using the optically thin (Case A) to optically thick (Case B) …
Hubble Space Telescope Search for Activity in High-perihelion Objects
Mutchler, Max; Jewitt, David; Agarwal, Jessica +2 more
Solar system objects with perihelia beyond the orbit of Jupiter (q > 5 au) are too cold for water ice to generate an appreciable coma via sublimation. Despite this, numerous high-perihelion objects (HPOs) including many comets and recently escaped Kuiper Belt objects (Centaurs) are observed to be active out at least to the orbit of Saturn (q ∼ …
Kinematical investigation of possible fast collimated outflows in twelve planetary nebulae
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +3 more
A significant fraction of planetary nebulae (PNe) exhibit collimated outflows, distinct narrow kinematical components with notable velocity shifts with respect to the main nebular shells typically associated with low-ionization compact knots and linear or precessing jet-like features. We present here a spatio-kinematical investigation of a sample …
Constraining the Mass of the Emerging Galaxy Cluster SpARCS1049+56 at z = 1.71 with Infrared Weak Lensing
Muzzin, Adam; Perlmutter, Saul; Wilson, Gillian +4 more
In the hierarchical structure formation model of the universe, galaxy clusters are assembled through a series of mergers. Accordingly, it is expected that galaxy clusters in the early universe are actively forming and dynamically young. Located at a high redshift of z = 1.71, SpARCS1049+56 offers a unique look into the galaxy cluster formation pro…
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). II. The CHEOPS simulator
Queloz, D.; Benz, W.; Deline, A. +14 more
Context. The CHaracterising ExOPlanet Satellite (CHEOPS) is a mission dedicated to the search for exoplanetary transits through high precision photometry of bright stars already known to host planets. The telescope will provide the unique capability of determining accurate radii for planets whose masses have already been measured from ground-based…
Small Impact Crater Populations on Saturn's Moon Tethys and Implications for Source Impactors in the System
Ferguson, S. N.; Rhoden, A. R.; Kirchoff, M. R.
Current estimates place the ages of the inner Saturnian satellites (Mimas, Enceladus, Tethys, Dione, and Rhea) between 4.5 Gyr and 100 Myr. These estimates are based on impact crater measurements and dynamical simulations, both of which have uncertainties. Models of satellite evolution are inherently simplified and rely on uncertain or unknown par…
Beyond Gaia: Asteroseismic Distances of M Giants Using Ground-based Transient Surveys
Kochanek, C. S.; Huber, Daniel; Tonry, John +14 more
Evolved stars near the tip of the red giant branch show solar-like oscillations with periods spanning hours to months and amplitudes ranging from ∼1 mmag to ∼100 mmag. The systematic detection of the resulting photometric variations with ground-based telescopes would enable the application of asteroseismology to a much larger and more distant samp…
Temporal and Periodic Variation of the MCMESI for the Last Two Solar Cycles; Comparison with the Number of Different Class X-ray Solar Flares
Kilcik, Ali; Chowdhury, Partha; Sarp, Volkan +4 more
In this study we compared the temporal and periodic variations of the Maximum CME Speed Index (MCMESI) and the the number of different class (C, M, and X) solar X-ray flares for the last two solar cycles (Solar Cycles 23 and 24). To obtain the correlation between the MCMESI and solar flare numbers the cross-correlation analysis was applied to mont…
A Fully Kinetic Perspective of Electron Acceleration around a Weakly Outgassing Comet
Henri, Pierre; Lapenta, Giovanni; Divin, Andrey +4 more
The cometary mission Rosetta has shown the presence of higher-than-expected suprathermal electron fluxes. In this study, using 3D fully kinetic electromagnetic simulations of the interaction of the solar wind with a comet, we constrain the kinetic mechanism that is responsible for the bulk electron energization that creates the suprathermal distri…
The Origin of a Distributed Stellar Population in the Star-forming Region W4
Lim, Beomdu; Lee, Jeong-Eun; Yun, Hyeong-Sik +5 more
Stellar kinematics provides the key to understanding the formation process and dynamical evolution of stellar systems. Here, we present a kinematic study of the massive star-forming region (SFR) W4 in the Cassiopeia OB6 association using the Gaia Data Release 2 and high-resolution optical spectra. This SFR is composed of a core cluster (IC 1805) a…