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Multi-line Herschel/HIFI observations of water reveal infall motions and chemical segregation around high-mass protostars
Shipman, R. F.; Braine, J.; van der Tak, F. F. S. +3 more
Context. The physical conditions during high-mass star formation are poorly understood. Outflow and infall motions have been detected around massive protostellar objects, but their dependence on mass, luminosity, and age is unclear. In addition, physical conditions and molecular abundances are often estimated using simple assumptions such as spher…
ALMA observations of massive molecular gas reservoirs in dusty early-type galaxies
Smith, M.; Dunne, L.; Eales, S. +9 more
Unresolved gas and dust observations show a surprising diversity in the amount of interstellar matter in early-type galaxies. Using Atacama Large Millimetre/submillimeter Array (ALMA) observations we resolve the ISM in z ∼ 0.05 early-type galaxies. From a large sample of early-type galaxies detected in the Herschel Astrophysical Terahertz Large Ar…
Does High-density or Mass Help Star Clusters Produce X-Ray Binaries in Star-forming Galaxies?
Chandar, R.; Johns Mulia, P.; Rangelov, B.
It is now widely accepted that many X-ray binaries (XRBs) form in compact star clusters. Therefore, it follows that there may be a link between the properties of star clusters and the production of XRBs. We study the masses and densities of compact clusters with different ages found in the merging Antennae galaxies and in the dwarf starburst NGC 4…
A 183-GHz InP/CMOS-Hybrid Heterodyne-Spectrometer for Spaceborne Atmospheric Remote Sensing
Zhang, Yan; Kim, Yanghyo; James Reck, Theodore +5 more
The GALAH survey: velocity fluctuations in the Milky Way using Red Clump giants
Lewis, Geraint F.; Ting, Yuan-Sen; Wittenmyer, Robert A. +20 more
If the Galaxy is axisymmetric and in dynamical equilibrium, we expect negligible fluctuations in the residual line-of-sight velocity field. Recent results using the APOGEE survey find significant fluctuations in velocity for stars in the mid-plane (|z| <0.25 kpc) out to 5 kpc, suggesting that the dynamical influence of non-axisymmetric features…
The Pulsating Eclipsing Binary TIC 309658221 in a 7.59-day Orbit
Kristiansen, Martti H.; Hong, Kyeongsoo; Lee, Jae Woo
We present a new eclipsing binary (EB) showing multiperiodic oscillations using the first three sectors of Transiting Exoplanet Survey Satellite (TESS) photometry. The eclipse and pulsation light curves of TIC 309658221 were modeled using an iterative method to obtain a consistent photometric solution. The TESS target is a circular-orbit, detached…
ExoMars Atmospheric Mars Entry and Landing Investigations and Analysis (AMELIA)
Colombatti, Giacomo; Bettanini, Carlo; Aboudan, Alessio +25 more
The entry, descent and landing of Schiaparelli, the ExoMars Entry, descent and landing Demonstrator Module (EDM), offered a rare (once-per-mission) opportunity for in situ investigations of the martian environment over a wide altitude range. The aim of the ExoMars AMELIA experiment was to exploit the Entry, Descent and Landing System (EDLS) engine…
Atmospheres and UV Environments of Earth-like Planets throughout Post-main-sequence Evolution
Kaltenegger, Lisa; Kozakis, Thea
During the post-main-sequence (post-MS) phase of stellar evolution, the orbital distance of the habitable zone (HZ), which allows for liquid surface water on terrestrial planets, moves out past the system’s original frost line, providing an opportunity for outer planetary system surface habitability. We use a 1D coupled climate/photochemistry code…
The Deposition and Alteration History of the Northeast Syrtis Major Layered Sulfates
Ehlmann, B. L.; Quinn, D. P.
Ancient stratigraphy on Isidis Basin's western margin records the history of water on early Mars. Noachian units are overlain by layered, basaltic composition sedimentary rocks that are enriched in polyhydrated sulfates and capped by more resistant units. The layered sulfates—uniquely exposed at northeast Syrtis Major—comprise a sedimentary sequen…
A NuSTAR view of powerful γ-ray loud blazars
Tagliaferri, G.; Ghirlanda, G.; Ghisellini, G. +6 more
We observed three blazars at z > 2 with the NuSTAR satellite. These were detected in the γ-rays by Fermi/LAT and in the soft X-rays, but have not yet been observed above 10 keV. The flux and slope of their X-ray continuum, together with Fermi/LAT data allows us to estimate their total electromagnetic output and peak frequency. For some of them …