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Iron-group Abundances in the Metal-poor Main-Sequence Turnoff Star HD~84937
Kobayashi, Chiaki; Sneden, Christopher; Cowan, John J. +4 more
We have derived new, very accurate abundances of the Fe-group elements Sc through Zn (Z = 21-30) in the bright main-sequence turnoff star HD 84937 based on high-resolution spectra covering the visible and ultraviolet spectral regions. New or recent laboratory transition data for 14 species of seven elements have been used. Abundances from more tha…
Possible Signatures of a Cold-flow Disk from MUSE Using a z ∼ 1 Galaxy-Quasar Pair toward SDSS J1422-0001
Carollo, C. M.; Lilly, S.; Kollatschny, W. +19 more
We use a background quasar to detect the presence of circumgalactic gas around a z=0.91 low-mass star-forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope show that the galaxy has a dust-corrected star formation rate (SFR) of 4.7 ± 2.0 M⊙ yr-1, with no companion down to 0.22 M…
Fractal cometary dust - a window into the early Solar system
Bentley, M. S.; Mannel, T.; Schmied, R. +4 more
The properties of dust in the protoplanetary disc are key to understanding the formation of planets in our Solar system. Many models of dust growth predict the development of fractal structures which evolve into non-fractal, porous dust pebbles representing the main component for planetesimal accretion. In order to understand comets and their orig…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Search for [CII] Line and Dust Emission in 6
Smail, I.; Magnelli, B.; Daddi, E. +29 more
We present a search for [C II] line and dust continuum emission from optical dropout galaxies at z > 6 using ASPECS, our Atacama Large Millimeter submillimeter Array Spectroscopic Survey in the Hubble Ultra-deep Field (UDF). Our observations, which cover the frequency range of 212-272 GHz, encompass approximately the range of 6 < z < 8 fo…
Flux and composition of interstellar dust at Saturn from Cassini’s Cosmic Dust Analyzer
Kempf, S.; Postberg, F.; Srama, R. +12 more
Interstellar dust (ISD) is the condensed phase of the interstellar medium. In situ data from the Cosmic Dust Analyzer on board the Cassini spacecraft reveal that the Saturnian system is passed by ISD grains from our immediate interstellar neighborhood, the local interstellar cloud. We determine the mass distribution of 36 interstellar grains, thei…
Cosmological axion and neutrino mass constraints from Planck 2015 temperature and polarization data
Di Valentino, Eleonora; Melchiorri, Alessandro; Mena, Olga +3 more
Axions currently provide the most compelling solution to the strong CP problem. These particles may be copiously produced in the early universe, including via thermal processes. Therefore, relic axions constitute a hot dark matter component and their masses are strongly degenerate with those of the three active neutrinos, as they leave identical s…
First detection of a diamagnetic cavity at comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Glassmeier, K. -H.; Nilsson, H. +16 more
Context. The Rosetta magnetometer RPC-MAG has been exploring the plasma environment of comet 67P/Churyumov-Gerasimenko since August 2014. The first months were dominated by low-frequency waves which evolved into more complex features. However, at the end of July 2015, close to perihelion, the magnetometer detected a region that did not contain any…
The extraordinary amount of substructure in the Hubble Frontier Fields cluster Abell 2744
Kneib, J. -P.; Egami, E.; Eckert, D. +21 more
We present a joint optical/X-ray analysis of the massive galaxy cluster Abell 2744 (z = 0.308). Our strong- and weak-lensing analysis within the central region of the cluster, I.e. at R < 1 Mpc from the brightest cluster galaxy, reveals eight substructures, including the main core. All of these dark matter haloes are detected with a significanc…
Measuring the dynamical state of Planck SZ-selected clusters: X-ray peak - BCG offset
Bersanelli, M.; Maino, D.; Rossetti, M. +6 more
We want to characterize the dynamical state of galaxy clusters detected with the Sunyaev-Zeldovich (SZ) effect by Planck and compare them with the dynamical state of clusters selected in X-rays survey. We analysed a representative subsample of the Planck SZ catalogue, containing the 132 clusters with the highest signal to noise ratio and character…
Gaia Data Release 1. Pre-processing and source list creation
Mora, A.; Boudreault, S.; Jordan, S. +104 more
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, and proper motions and parallaxes for the majority of the 2.5 million Hipparcos and Tycho-2 stars.
Aims: We describe three essential elements of the initial data treatment leading to this catalogue: the image analy…