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Spectral Energy Distributions of Companion Galaxies to z ∼ 6 Quasars
Walter, F.; Rix, H. -W.; Fan, X. +10 more
Massive, quiescent galaxies are already observed at redshift z ∼ 4, i.e., ∼1.5 Gyr after the big bang. Current models predict them to be formed via massive, gas-rich mergers at z > 6. Recent ALMA observations of the cool gas and dust in z ≳ 6 quasars have discovered [C II]- and far-infrared-bright galaxies adjacent to several quasars. In this w…
Mass Loss of Different Stellar Populations in Globular Clusters: The Case of M4
Milone, A. P.; Cordoni, G.; Marino, A. F. +3 more
In a Globular Cluster (GC), the mass loss during the red giant branch (RGB) phase and the helium content are fundamental ingredients to constrain the horizontal-branch (HB) morphology. While many papers have been dedicated to the helium abundance in different stellar populations, small efforts have been made to disentangle the effects of mass loss…
Transit Lyman-α signatures of terrestrial planets in the habitable zones of M dwarfs
Holmström, M.; Lammer, H.; Güdel, M. +6 more
Aims: We modeled the transit signatures in the Lyman-alpha (Ly-α) line of a putative Earth-sized planet orbiting in the habitable zone (HZ) of the M dwarf GJ 436. We estimated the transit depth in the Ly-α line for an exo-Earth with three types of atmospheres: a hydrogen-dominated atmosphere, a nitrogen-dominated atmosphere, and a nitrogen-do…
Launch of a CME-associated eruptive prominence as observed with IRIS and ancillary instruments
Vial, J. -C.; Zhang, P.; Buchlin, É.
Aims: In this paper we focus on the possible observational signatures of the processes which have been put forward for explaining eruptive prominences. We also try to understand the variations in the physical conditions of eruptive prominences and estimate the masses leaving the Sun versus the masses returning to the Sun during eruptive promi…
Using Science-Driven Analog Research to Investigate Extravehicular Activity Science Operations Concepts and Capabilities for Human Planetary Exploration
Brady, Allyson L.; Kobs Nawotniak, Shannon E.; Hughes, Scott S. +7 more
Biologic Analog Science Associated with Lava Terrains (BASALT) is a science-driven exploration program seeking to determine the best tools, techniques, training requirements, and execution strategies for conducting Mars-relevant field science under spaceflight mission conditions. BASALT encompasses Science, Science Operations, and Technology objec…
The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy
Le Floc'h, E.; Pian, E.; Bournaud, F. +8 more
We report Giant Metrewave Radio Telescope (GMRT), Very Large Telescope (VLT), and Spitzer Space Telescope observations of ESO 184-G82, the host galaxy of GRB 980425/SN 1998bw, that yield evidence of a companion dwarf galaxy at a projected distance of 13 kpc. The companion, hereafter GALJ193510-524947, is a gas-rich, star-forming galaxy with a star…
A study of cool white dwarfs in the Sloan Digital Sky Survey Data Release 12
Kepler, S. O.; Koester, D.; Ourique, G. +2 more
In this work, we study white dwarfs where 30 000 K > T_{eff} > 5000 K to compare the differences in the cooling of DAs and non-DAs and their formation channels. Our final sample is composed by nearly 13 000 DAs and more than 3 000 non-DAs that are simultaneously in the SDSS DR12 spectroscopic database and in the Gaia survey DR2. We present t…
GIADA microbalance measurements on board Rosetta: submicrometer- to micrometer-sized dust particle flux in the coma of comet 67P/Churyumov-Gerasimenko
Fulle, M.; Della Corte, V.; Rotundi, A. +7 more
Context. From August 2014 to September 2016, Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its journey around the Sun. One of the aims of Rosetta was to characterize cometary activity and the consequent formation of dust flux structures in cometary comae.
Aims: We characterize and quantify the submicrometer- to micrometer-size…
The dust in M31
Dalcanton, J. J.; Griffin, M. J.; Smith, M. W. L. +6 more
We have analysed Herschel observations of M31, using the PPMAP procedure. The resolution of PPMAP images is sufficient (∼ 31 pc on M31) that we can analyse far-IR dust emission on the scale of giant molecular clouds. By comparing PPMAP estimates of the far-IR emission optical depth at 300 µ m (τ_{{300}}), and the near-IR extinction optical d…
A spatio-kinematic model for jets in post-AGB stars
De Marco, O.; Van Winckel, H.; Kamath, D. +1 more
Aims: We aim to determine the geometry, density gradient, and velocity structure of jets in post-asymptotic giant branch (post-AGB) binaries.
Methods: Our high cadence time series of high-resolution optical spectra of jet-creating post-AGB binary systems provide us with a unique tomography of the jet. We determine the spatio-kinematic st…