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Formation of bi-lobed shapes by sub-catastrophic collisions. A late origin of comet 67P's structure
Benz, W.; Jutzi, M.
Context. The origin of the particular shape of comet 67P/Churyumov-Gerasimenko (67P) is a topic of active research. How and when it acquired its peculiar characteristics has distinct implications on the origin of the solar system and its dynamics.
Aims: We investigate how shapes such as that of comet 67P can result from a new type of low-ener…
Do galaxies that leak ionizing photons have extreme outflows?
Chisholm, J.; Schaerer, D.; Thuan, T. X. +5 more
Context. To reionize the early universe, high-energy photons must escape the galaxies that produce them. How these photons escape is debated because too many ionizing photons are absorbed even at small H I column densities. It has been suggested that stellar feedback drives galactic outflows out of star-forming regions, creating low density channe…
The Complete Local Volume Groups Sample - I. Sample selection and X-ray properties of the high-richness subsample
Babul, Arif; Raychaudhury, Somak; Ponman, Trevor J. +7 more
We present the Complete Local-Volume Groups Sample (CLoGS), a statistically complete optically selected sample of 53 groups within 80 Mpc. Our goal is to combine X-ray, radio and optical data to investigate the relationship between member galaxies, their active nuclei and the hot intra-group medium (IGM). We describe sample selection, define a 26-…
Interstellar Pickup Ion Observations to 38 au
McComas, D. J.; Schwadron, N. A.; Szalay, J. R. +9 more
We provide the first direct observations of interstellar H+ and He+ pickup ions in the solar wind from 22 to 38 au. We use the Vasyliunas and Siscoe model functional form to quantify the pickup ion distributions, and while the fit parameters generally lie outside their physically expected ranges, this form allows fits that qu…
BANYAN. IX. The Initial Mass Function and Planetary-mass Object Space Density of the TW HYA Association
Weinberger, Alycia J.; Donaldson, Jessica K.; Burgasser, Adam J. +15 more
A determination of the initial mass function (IMF) of the current, incomplete census of the 10 Myr-old TW Hya association (TWA) is presented. This census is built from a literature compilation supplemented with new spectra and 17 new radial velocities from ongoing membership surveys, as well as a reanalysis of Hipparcos data that confirmed HR 4334…
Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades
Aigrain, S.; Grundahl, F.; Albrecht, S. +20 more
The most powerful tests of stellar models come from the brightest stars in the sky, for which complementary techniques, such as astrometry, asteroseismology, spectroscopy and interferometry, can be combined. The K2 mission is providing a unique opportunity to obtain high-precision photometric time series for bright stars along the ecliptic. Howeve…
A Submillimeter Perspective on the GOODS Fields (SUPER GOODS). I. An Ultradeep SCUBA-2 Survey of the GOODS-N
Wang, W. -H.; Owen, F. N.; Barger, A. J. +3 more
In this first paper in the SUPER GOODS series on powerfully star-forming galaxies in the two GOODS fields, we present a deep SCUBA-2 survey of the GOODS-N at both 850 and 450 µm (central rms noise of 0.28 mJy and 2.6 mJy, respectively). In the central region, the 850 µm observations cover the GOODS-N to near the confusion limit of ∼1.6…
The population of hot subdwarf stars studied with Gaia. I. The catalog of known hot subdwarf stars
Geier, S.; Gänsicke, B. T.; Green, E. M. +5 more
In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classi…
Multiple stellar populations in Magellanic Cloud clusters - V. The split main sequence of the young cluster NGC 1866
Anderson, J.; Milone, A. P.; Marino, A. F. +7 more
One of the most unexpected results in the field of stellar populations of the last few years is the discovery that some Magellanic Cloud globular clusters younger than ∼400 Myr exhibit bimodal main sequences (MSs) in their colour-magnitude diagrams (CMDs). Moreover, these young clusters host an extended main-sequence turn-off (eMSTO) in close anal…
Coherent Structures at Ion Scales in Fast Solar Wind: Cluster Observations
Maksimovic, M.; Alexandrova, O.; Lion, S. +5 more
We investigate the nature of magnetic turbulent fluctuations, around ion characteristic scales, in a fast solar wind stream, by using Cluster data. Contrarily to slow solar wind, where both Alfvénic (δ {b}\perp \gg δ {b}\parallel ) and compressive (δ {b}\parallel \gg δ {b}\perp ) coherent structures are …