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The Enigmatic (Almost) Dark Galaxy Coma P: The Atomic Interstellar Medium
McQuinn, Kristen B. W.; Cannon, John M.; Salzer, John J. +12 more
We present new high-resolution H I spectral line imaging of Coma P, the brightest H I source in the system HI 1232+20. This galaxy with extremely low surface brightness was first identified in the ALFALFA survey as an “(Almost) Dark” object: a clearly extragalactic H I source with no obvious optical counterpart in existing optical survey data (alt…
Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52
Daddi, E.; Rodighiero, G.; Smolčić, V. +20 more
We report on the discovery of a merger-driven starburst at z = 1.52, PACS-787, based on high signal-to-noise ALMA observations. CO(5-4) and continuum emission (850 µm) at a spatial resolution of 0.″3 reveal two compact (r 1/2 ∼ 1 kpc) and interacting molecular gas disks at a separation of 8.6 kpc, indicative of an early stage in a…
Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
Gupta, G. R.; Tripathi, Durgesh; Sarkar, Aveek
Using the observations recorded by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory and the Interface Region Imaging Spectrograph (IRIS) and the Extreme-ultraviolet Imaging Spectrometer and X-Ray Telescope both on board Hinode, we present evidence of chromospheric evaporation in a coronal loop after the occurrence of …
Copper abundance from Cu I and Cu II lines in metal-poor star spectra: NLTE versus LTE
Korotin, S. A.; Andrievsky, S. M.; Zhukova, A. V.
We have checked the consistency between the copper abundance derived in six metal-poor stars using ultraviolet (UV) Cu II lines, which are assumed to form in the local thermodynamic equilibrium (LTE), and UV Cu I lines, treated in the non-local thermodynamic equilibrium (NLTE). The stars in our programme cover the atmospheric parameters that are t…
Around the Way: Testing ΛCDM with Milky Way Stellar Stream Constraints
Robertson, Brant E.; Madau, Piero; Dai, Biwei
Recent analyses of the Pal 5 and GD-1 tidal streams suggest that the inner dark matter halo of the Milky Way is close to spherical, in tension with predictions from collisionless N-body simulations of cosmological structure formation. We use the Eris simulation to test whether the combination of dissipative physics and hierarchical structure forma…
Extended Dust Emission from Nearby Evolved Stars
Kemper, Francisca; Cami, Jan; Scicluna, Peter +6 more
We present James Clerk Maxwell Telescope Sub-millimetre Common-User Bolometer Array 2 (SCUBA-2) 450 and 850 {µ} m observations of 14 asymptotic giant branch stars (9 O-rich, 4 C-rich, and 1 S-type) and one red supergiant in the solar neighbourhood. We combine these observations with Herschel/PACS observations at 70 and 160 {µ} m and ob…
Discovery of Tidal RR Lyrae Stars in the Bulge Globular Cluster M62
Minniti, Dante; Marconi, Marcella; Ripepi, Vincenzo +3 more
The RR Lyrae (RRL) rich globular cluster M62 (NGC 6266) is one of the most massive globular clusters in the Milky Way, located in the dense region of the Galactic bulge, where dynamical processes that affect the survival of globular clusters are maximized. Using Gaia second data release data we have found clear evidence for an excess of RRLs beyon…
Comprehensive Analysis of HD 105, A Young Solar System Analog
Marshall, J. P.; del Burgo, C.; Ertel, S. +5 more
HD 105 is a nearby, pre-main-sequence G0 star hosting a moderately bright debris disk (L dust/L ⋆ ∼ 2.6 × 10-4). The star and its surroundings might therefore be considered an analog of the young solar system. We refine the stellar parameters based on an improved Gaia parallax distance and identify it as a pre-main…
MGS-TES Spectra Suggest a Basaltic Component in the Regolith of Phobos
Glotch, Timothy D.; Edwards, Christopher S.; Yesiltas, Mehmet +5 more
The origins of the Martian moons Phobos and Deimos have been the subjects of considerable debate. Visible and near-infrared spectra of these bodies are dark and nearly featureless, with red slopes of varying degrees. These spectra are generally consistent with those of carbonaceous asteroids, leading to the hypothesis that Phobos and Deimos are ca…
Importance of the Hα Visibility and Projection Effects for the Interpretation of Prominence Fine-structure Observations
Heinzel, Petr; Aulanier, Guillaume; Schmieder, Brigitte +2 more
We construct a new 3D Whole-prominence Fine-structure (WPFS) model based on a prominence magnetic field configuration designed to qualitatively approximate the morphology of a quiescent prominence observed on 2010 June 22. The model represents an entire prominence with its numerous fine structures formed by a prominence plasma located in dips in t…