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Evidence for Spatially Correlated Gaia Parallax Errors in the Kepler Field
Huber, Daniel; Stello, Dennis; Pinsonneault, Marc H. +1 more
We present evidence for a spatially dependent systematic error in the first data release of Gaia parallaxes based on comparisons to asteroseismic parallaxes in the Kepler field and provide a parameterized model of the angular dependence of these systematics. We report an error of {0.059}-0.004+0.004 mas on scales of 0.°3, whi…
Measurement of the X-ray proper motion in the south-east rim of RX J1713.7-3946
Acero, Fabio; Katsuda, Satoru; Ballet, Jean +1 more
We report on the first proper motion measurement in the supernova remnant RX J1713.7-3946 using the XMM-Newton X-ray telescope on a 13 yr time interval. This expansion measurement is carried out in the south-east region of the remnant, where two sharp filament structures are observed. For the outermost filament, the proper motion is 0.75+0.05…
Ion-Ion Equilibration and Particle Distributions in a 3000 km s-1 Shock in SN 1006
Raymond, J. C.; Laming, J. M.; Blair, W. P. +1 more
SN 1006 is the most attractive target for investigating the physics of collisionless shock waves faster than 2000 {km} {{{s}}}-1. We obtained UV and optical spectra and an Hα image of a 3000 {km} {{{s}}}-1 shock driven by a clump of ejecta that has overtaken the blast wave. It is 500 km s-1 faster than the filament…
The mass-metallicity relation of AKARI-FMOS infrared galaxies at z ∼ 0.88 in the AKARI North Ecliptic Pole Deep Survey Field
Goto, Tomotsugu; Pearson, Chris; Matsuhara, Hideo +2 more
The mass, metallicity, and star formation rate (SFR) of a galaxy are crucial parameters in understanding galaxy formation and evolution. However, the relation between these parameters, (i.e., the fundamental relation) is still a matter of debate for luminous infrared (IR) galaxies, which carry a bulk of the SFR budget of the universe at z ∼ 1. We …
Zooming into the Cosmic Horseshoe: new insights on the lens profile and the source shape
Metcalf, R. Benton; Tessore, Nicolas; Bellagamba, Fabio
The gravitational lens SDSS J1148+1930, also known as the Cosmic Horseshoe, is one of the biggest and most detailed Einstein rings ever observed. We use the forward reconstruction method implemented in the lens-fitting code LENSED to investigate in great detail the properties of the lens and background source. We model the lens with different mass…
Two-dimensional ice mapping of molecular cores
Pontoppidan, K. M.; Noble, J. A.; Fraser, H. J. +1 more
We present maps of the column densities of H2O, CO2 and CO ices towards the molecular cores B 35A, DC 274.2-00.4, BHR 59 and DC 300.7-01.0. These ice maps, probing spatial distances in molecular cores as low as 2200 au, challenge the traditional hypothesis that the denser the region observed, the more ice is present, providin…
Plasma waves confined to the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Gunell, H.; Nilsson, H.; Hamrin, M. +11 more
Ion acoustic waves were observed in the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko by the Rosetta spacecraft on 2015 August 3, when the comet was 1.25 au from the Sun. Wave spectra recorded by the Langmuir probe (RPC-LAP), peak near 200 Hz, decrease for higher frequencies and reach the noise floor at approximately 1.5 kHz. These waves w…
Oxygen budget in low-mass protostars: the NGC 1333-IRAS4A R1 shock observed in [O I] at 63 µm with SOFIA-GREAT
Güsten, R.; Simon, R.; Karska, A. +5 more
In molecular outflows from forming low-mass protostars, most oxygen is expected to be locked up in water. However, Herschel observations have shown that typically an order of magnitude or more of the oxygen is still unaccounted for. To test if the oxygen is instead in atomic form, SOFIA-GREAT observed the R1 position of the bright molecular outflo…
Constraining the Enceladus plume using numerical simulation and Cassini data
Trafton, Laurence M.; Levin, Deborah A.; Goldstein, David B. +3 more
Since its discovery, the Enceladus plume has been subjected to intense study due to the major effects that it has on the Saturnian system and the window that it provides into the interior of Enceladus. However, several questions remain and we attempt to answer some of them in this work. In particular, we aim to constrain the H2O product…
Clues to the Formation of Spiral Structure in M51 from the Ages and Locations of Star Clusters
Calzetti, Daniela; Schinnerer, Eva; Whitmore, Bradley C. +8 more
We determine the spatial distributions of star clusters at different ages in the grand-design spiral galaxy M51 using a new catalog based on multi-band images taken with the Hubble Space Telescope (HST). These distributions, when compared with the spiral structure defined by molecular gas, dust, young and old stars, show the following sequence in …