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Multi Spacecraft Measurement of Anisotropic Spatial Correlation Functions at Kinetic Range in the Magnetosheath Turbulence
Zhang, J.; Deng, X. H.; Huang, S. Y. +9 more
We investigate spatial correlation functions (SCFs) at kinetic range in the terrestrial magnetosheath because of wide angular distributions of the magnetic field fluctuations and the high Signal to Noise Ratio. We employ four point measurements of magnetic fluctuations from the Cluster and MMS concerning a spatiotemporally varying background magne…
2M17091769+3127589: A Mass-transfer Binary with an Extreme Mass Ratio
Stassun, Keivan G.; Kounkel, Marina; Covey, K. R. +5 more
We present the orbital solution of a peculiar double-lined spectroscopic and eclipsing binary system, 2M17091769+3127589. This solution was obtained by a simultaneous fit of both APOGEE radial velocities and TESS and ASAS-SN light curves to determine masses and radii. This system consists of an $M={0.256}_{-0.006}^{+0.010}$ M⊙, $R={3.96…
CaSSIS Color and multi-angular observations of martian slope streaks
Patel, M. R.; Pajola, M.; Cremonese, G. +12 more
Slope streaks are albedo features that form frequently on equatorial Martian slopes. Most slope streaks are dark relative to surrounding terrains, a minor fraction is bright, and there are rare transitioning streaks that exhibit a contrast reversal partway downslope. Their formation mechanisms and physical surface properties are not well understoo…
Extended HNCO, SiO, and HC3N Emission in 43 Southern Star-forming Regions
Liu, Hong-Li; Zhou, Jian-Jun; Wu, Gang +9 more
We have selected 43 southern massive star-forming regions to study the spatial distribution of HNCO 404-303, SiO 2-1, and HC3N 10-9 line emission and to investigate their spatial association with the dust emission. The morphology of HNCO 404-303 and HC3N 10-9 agrees well with the du…
Far-ultraviolet Variable Sources in M31
Leahy, Denis; Buick, Megan; Postma, Joseph +1 more
The Ultraviolet Imaging Telescope (UVIT) on board the AstroSat observatory has imaged the Andromeda galaxy (M31) from 2017 to 2019 in the far- and near-UV (FUV and NUV) with the high spatial resolution of ≃1″. The survey covered the large sky area of M31 with a set of observations (Fields), each 28' in diameter. Field 1 was observed in two epochs …
A Spectroscopic Study of Supernova Remnants with the Infrared Space Observatory
Rho, Jeonghee; Ravi, Aravind P.; Park, Sangwook +1 more
We present far-infrared (FIR) spectroscopy of supernova remnants (SNRs) based on the archival data of the Infrared Space Observatory taken with the Long Wavelength Spectrometer (LWS). Our sample includes previously unpublished profiles of line and continuum spectra for 20 SNRs in the Galaxy and Magellanic Clouds. In several SNRs including G21.5-0.…
Data reduction and calibration accuracy of the imaging Fourier transform spectrometer SITELLE
Prunet, S.; Drissen, L.; Martin, T.
SITELLE, an imaging Fourier Transform Spectrometer, is part of the Canada-France-Hawaii instrument suite. It delivers spectral cubes covering an 11 arcmin × 11 arcmin field of view with a seeing-limited spatial resolution and a tunable spectral resolution (R ~ 1-10 000) in selected bands of the visible range (350-900 nm). We present a complete pic…
Dynamically produced moving groups in interacting simulations
Craig, Peter; Chakrabarti, Sukanya; Quillen, Alice +1 more
We show that smoothed particle hydrodynamics (SPH) simulations of dwarf galaxies interacting with a Milky Way-like disc produce moving groups in the simulated stellar disc. We analyse three different simulations: one that includes dwarf galaxies that mimic the Large Magellanic Cloud, Small Magellanic Cloud, and the Sagittarius dwarf spheroidal; an…
Kronoseismology V: A panoply of waves in Saturn's C ring driven by high-order internal planetary oscillations
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +3 more
Saturn's rings act as a system of innumerable test particles that are remarkably sensitive to periodic disturbances in the planet's gravitational field. We identify 15 additional density and bending waves in Saturn's C ring driven by the planet's internal normal mode oscillations. The collective response of the rings to Saturn's oscillations resul…
Application of a new X-ray reflection model to V1223 Sagittarii
Ishida, Manabu; Hayashi, Takayuki; Kitaguchi, Takao
In intermediate polars (IPs), the intrinsic thermal emissions from white dwarfs (WDs) have typically been studied. Few reports have analysed X-ray reflections from WDs. We recently developed an elaborate IP-reflection spectral model. Herein, we report the first application of a reflection model with an IP thermal model to the spectra of the bright…