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The dust-to-ices ratio in comets and Kuiper belt objects
Fulle, M.; Colangeli, L.; Della Corte, V. +7 more
Comet 67P/Churyumov-Gerasimenko (67P hereinafter) is characterized by a dust transfer from the southern hemi-nucleus to the night-side northern dust deposits, which constrains the dust-to-ices mass ratio inside the nucleus to values a factor of 2 larger than that provided by the lost mass of gas and non-volatiles. This applies to all comets becaus…
Extremely Small Sizes for Faint z ∼ 2-8 Galaxies in the Hubble Frontier Fields: A Key Input for Establishing Their Volume Density and UV Emissivity
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +3 more
We provide the first observational constraints on the sizes of the faintest galaxies lensed by the Hubble Frontier Fields (HFF) clusters. Ionizing radiation from faint galaxies likely drives cosmic reionization, and the HFF initiative provides a key opportunity to find such galaxies. However, we cannot assess their ionizing emissivity without a ro…
On the kinematic detection of accreted streams in the Gaia era: a cautionary tale
Haywood, M.; Combes, F.; Gómez, A. +4 more
The ΛCDM cosmological scenario predicts that our Galaxy should contain hundreds of stellar streams in the solar vicinity, fossil relics of the merging history of the Milky Way and more generally of the hierarchical growth of galaxies. Because of the mixing time scales in the inner Galaxy, it has been claimed that these streams should be difficult …
Panchromatic Hubble Andromeda Treasury. XVIII. The High-mass Truncation of the Star Cluster Mass Function
Dolphin, Andrew E.; Williams, Benjamin F.; Johnson, L. Clifton +7 more
We measure the mass function for a sample of 840 young star clusters with ages between 10 and 300 Myr observed by the Panchromatic Hubble Andromeda Treasury (PHAT) survey in M31. The data show clear evidence of a high-mass truncation: only 15 clusters more massive than {10}4 {M}⊙ are observed, compared to the ∼100 expected f…
Understanding the Physical Nature of Coronal "EIT Waves"
Long, D. M.; Veronig, A. M.; Vršnak, B. +9 more
For almost 20 years the physical nature of globally propagating waves in the solar corona (commonly called "EIT waves") has been controversial and subject to debate. Additional theories have been proposed over the years to explain observations that did not agree with the originally proposed fast-mode wave interpretation. However, the incompatibili…
LACEwING: A New Moving Group Analysis Code
Blunt, Sarah C.; Faherty, Jacqueline K.; Cruz, Kelle L. +3 more
We present a new nearby young moving group (NYMG) kinematic membership analysis code, LocAting Constituent mEmbers In Nearby Groups (LACEwING), a new Catalog of Suspected Nearby Young Stars, a new list of bona fide members of moving groups, and a kinematic traceback code. LACEwING is a convergence-style algorithm with carefully vetted membership s…
The Herschel Orion Protostar Survey: Luminosity and Envelope Evolution
Manoj, P.; Myers, Philip C.; Fischer, William J. +12 more
The Herschel Orion Protostar Survey obtained well-sampled 1.2-870 µm spectral energy distributions (SEDs) of over 300 protostars in the Orion molecular clouds, home to most of the young stellar objects (YSOs) in the nearest 500 pc. We plot the bolometric luminosities and temperatures for 330 Orion YSOs, 315 of which have bolometric temperatu…
Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
Fontaine, G.; Bergeron, P.; Bédard, A.
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techniques, and then to test the theoretical mass-radius relation for white dwarfs using these results. …
Magnifying the Early Episodes of Star Formation: Super Star Clusters at Cosmological Distances
Castellano, M.; Pentericci, L.; Vignali, C. +27 more
We study the spectrophotometric properties of a highly magnified (µ ≃ 40{--}70) pair of stellar systems identified at z = 3.2222 behind the Hubble Frontier Field galaxy cluster MACS J0416. Five multiple images (out of six) have been spectroscopically confirmed by means of VLT/MUSE and VLT/X-Shooter observations. Each image includes two faint…
The Rosetta mission orbiter science overview: the comet phase
Buratti, B. J.; Altobelli, N.; Taylor, M. G. G. T. +1 more
The international Rosetta mission was launched in 2004 and consists of the orbiter spacecraft Rosetta and the lander Philae. The aim of the mission is to map the comet 67P/Churyumov-Gerasimenko by remote sensing, and to examine its environment in situ and its evolution in the inner Solar System. Rosetta was the first spacecraft to rendezvous with …