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The Star Formation History in the Solar Neighborhood as Told by Massive White Dwarfs
Isern, Jordi
White dwarfs (WDs) are the remnants of low- and intermediate-mass stars. Because of electron degeneracy, their evolution is just a simple gravothermal process of cooling. Recently, thanks to Gaia data, it has been possible to construct the luminosity function of massive (0.9≤slant M/{M}⊙ ≤slant 1.1) WDs in the solar neighborhood (d< …
Evolved massive stars at low-metallicity. I. A source catalog for the Small Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Jiang, Bi-Wei +9 more
We present a clean, magnitude-limited (IRAC1 or WISE1 ≤ 15.0 mag) multiwavelength source catalog for the Small Magellanic Cloud (SMC) with 45 466 targets in total, with the purpose of building an anchor for future studies, especially for the massive star populations at low-metallicity. The catalog contains data in 50 different bands including 21 o…
Distances to molecular clouds at high galactic latitudes based on Gaia DR2
Macquart, Jean-Pierre; Xu, Ye; Yan, Qing-Zeng +4 more
We report the distances of molecular clouds at high Galactic latitudes (|b| > 10°) derived from parallax and G-band extinction (AG) measurements in the second Gaia data release, Gaia DR2. Aided by Bayesian analyses, we determined distances by identifying the breakpoint in the extinction AG toward molecular clouds and using…
Probing fragmentation and velocity sub-structure in the massive NGC 6334 filament with ALMA
André, Ph.; Arzoumanian, D.; Shimajiri, Y. +3 more
Context. Herschel imaging surveys of galactic interstellar clouds support a paradigm for low-mass star formation in which dense molecular filaments play a crucial role. The detailed fragmentation properties of star-forming filaments remain poorly understood, however, and the validity of the filament paradigm in the intermediate- to high-mass regim…
The Fraction of Active Galactic Nuclei in the USS 1558-003 Protocluster at z = 2.53
Miller, Eric D.; Koyama, Yusei; Kodama, Tadayuki +8 more
The incidence of active galactic nuclei (AGNs) within the local environment is a potentially valuable probe of the mechanisms that trigger and provide fuel for accretion onto supermassive black holes. While the correlation between AGN fraction and environment has been well-studied in the local universe, AGN fractions have been measured for relativ…
The metal-rich atmosphere of the exo-Neptune HAT-P-26b
Madhusudhan, Nikku; MacDonald, Ryan J.
Transmission spectroscopy is enabling precise measurements of atmospheric H2O abundances for numerous giant exoplanets. For hot Jupiters, relating H2O abundances to metallicities provides a powerful probe of their formation conditions. However, metallicity measurements for Neptune-mass exoplanets are only now becoming viable.…
METAL: The Metal Evolution, Transport, and Abundance in the Large Magellanic Cloud Hubble Program. I. Overview and Initial Results
Jenkins, Edward B.; Yanchulova Merica-Jones, Petia; Meixner, Margaret +8 more
Metal Evolution, Transport, and Abundance in the LMC (METAL) is a large Cycle 24 program on the Hubble Space Telescope aimed at measuring dust extinction properties and interstellar depletions in the Large Magellanic Cloud (LMC) at half-solar metallicity. The 101-orbit program is composed of Cosmic Origins Spectrograph and Space Telescope Imaging …
Warm FIRE: simulating galaxy formation with resonant sterile neutrino dark matter
Faucher-Giguère, Claude-André; Hopkins, Philip F.; Wetzel, Andrew +8 more
We study the impact of a warm dark matter (WDM) cosmology on dwarf galaxy formation through a suite of cosmological hydrodynamical zoom-in simulations of M_halo ≈ 10^{10} M_{⊙} dark matter haloes as part of the Feedback in Realistic Environments (FIRE) project. A main focus of this paper is to evaluate the combined effects of dark matter physics a…
Photochemical Hazes in Sub-Neptunian Atmospheres with a Focus on GJ 1214b
Showman, Adam P.; García Muñoz, Antonio; Steinrueck, Maria E. +2 more
We study the properties of photochemical hazes in super-Earth/mini-Neptune atmospheres with particular focus on GJ 1214b. We evaluate photochemical haze properties at different metallicities between solar and 10,000× solar. Within the four-order-of-magnitude change in metallicity, we find that the haze precursor mass fluxes change only by a factor…
The Sporadic Activity of (6478) Gault: A YORP-driven Event?
Wainscoat, Richard J.; Tonry, John; Ebeling, Harald +15 more
On 2019 January 5 a streamer associated with the 4-10 km main belt asteroid (6478) Gault was detected by the ATLAS sky survey, a rare discovery of activity around a main belt asteroid. Archival data from ATLAS and Pan-STARRS1 show the trail in early 2018 December, but not between 2010 and 2018 January. The feature has significantly changed over on…