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The Structure of Chariklo’s Rings from Stellar Occultations
Colas, F.; Bérard, D.; Kervella, P. +79 more
Two narrow and dense rings (called C1R and C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on 2013 June 3. Following this discovery, we planned observations of several occultations by Chariklo’s system in order to better characterize the physical properties of the ring and main body. Here, we u…
A First Comparison of Millimeter Continuum and Mg II Ultraviolet Line Emission from the Solar Chromosphere
De Pontieu, B.; Schmit, D.; Leenaarts, J. +4 more
We present joint observations of the Sun by the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph (IRIS). Both millimeter/submillimeter-λ continuum emission and ultraviolet (UV) line emission originate from the solar chromosphere and both have the potential to serve as powerful and complementary diag…
Modeling dust emission in the Magellanic Clouds with Spitzer and Herschel
Gordon, Karl D.; Bot, Caroline; Chastenet, Jérémy +4 more
Context. Dust modeling is crucial to infer dust properties and budget for galaxy studies. However, there are systematic disparities between dust grain models that result in corresponding systematic differences in the inferred dust properties of galaxies. Quantifying these systematics requires a consistent fitting analysis.
Aims: We compare th…
Cluster and field elliptical galaxies at z 1.3. The marginal role of the environment and the relevance of the galaxy central regions
Marchesini, D.; Gargiulo, A.; Saracco, P. +1 more
Aims: The aim of this work is twofold: first, to assess whether the population of elliptical galaxies in cluster at z 1.3 differs from the population in the field and whether their intrinsic structure depends on the environment where they belong; second, to constrain their properties 9 Gyr back in time through the study of their scaling relat…
Reconstruction of constant slow-roll inflation
Gao, Qing
Using the relations between the slow-roll parameters and the power spectra for the single field slow-roll inflation, we derive the scalar spectral tilt n s and the tensor to scalar ratio r for the constant slow-roll inflation, and obtain the constraint on the slow-roll parameter η from the Planck 2015 results. The inflationary potenti…
Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
Bernard, J. -P.; Hill, T.; White, G. J. +29 more
We present far-infrared observations of Monoceros R2 (a giant molecular cloud at approximately 830 pc distance, containing several sites of active star formation), as observed at 70 µm, 160 µm, 250 µm, 350 µm, and 500 µm by the Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Rec…
Star Formation at z = 2.481 in the Lensed Galaxy SDSS J1110 = 6459. I. Lens Modeling and Source Reconstruction
Rigby, Jane R.; Florian, Michael; Whitaker, Katherine E. +6 more
Using the combined resolving power of the Hubble Space Telescope and gravitational lensing, we resolve star-forming structures in a z∼ 2.5 galaxy on scales much smaller than the usual kiloparsec diffraction limit of HST. SGAS J111020.0+645950.8 is a clumpy, star-forming galaxy lensed by the galaxy cluster SDSS J1110+6459 at z=0.659, with a total m…
The highly active Anhur-Bes regions in the 67P/Churyumov-Gerasimenko comet: results from OSIRIS/ROSETTA observations
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +51 more
The Southern hemisphere of the 67P/Churyumov-Gerasimenko comet has become visible from Rosetta only since 2015 March. It was illuminated during the perihelion passage and therefore it contains the regions that experienced the strongest heating and erosion rates, thus exposing the sub-surface most pristine material. In this work we investigate, tha…
The “UV-route” to Search for Blue Straggler Stars in Globular Clusters: First Results from the HST UV Legacy Survey
Dalessandro, E.; Nardiello, D.; Vesperini, E. +4 more
We used data from the Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters to select the Blue Straggler Star (BSS) population in four intermediate/high density systems (namely NGC 2808, NGC 6388, NGC 6541, and NGC 7078) through a “UV-guided search.” This procedure consists of using the F275W images in each cluster to construct the…
Importance of CME Radial Expansion on the Ability of Slow CMEs to Drive Shocks
Lugaz, Noé; Farrugia, Charles J.; Winslow, Reka M. +3 more
Coronal mass ejections (CMEs) may disturb the solar wind by overtaking it or expanding into it, or both. CMEs whose front moves faster in the solar wind frame than the fast magnetosonic speed drive shocks. Such shocks are important contributors to space weather, by triggering substorms, compressing the magnetosphere, and accelerating particles. In…