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Aluminium-enriched metal-poor stars buried in the inner Galaxy
Beers, Timothy C.; Minniti, Dante; Geisler, Doug +5 more
Stars with higher levels of aluminium and nitrogen enrichment are often key pieces in the chemical makeup of multiple populations in almost all globular clusters (GCs). There is also compelling observational evidence that some Galactic components could be partially built from dissipated GCs. The identification of such stars among metal-poor field …
The dust mass function from z ∼0 to z ∼2.5
Pozzi, F.; Santini, P.; Gruppioni, C. +3 more
We derive for the first time the dust mass function (DMF) in a wide redshift range, from z ∼ 0.2 up to z ∼ 2.5. In order to trace the dust emission, we start from a far-IR (160-µm) Herschel selected catalogue in the COSMOS field. We estimate the dust masses by fitting the far-IR data (λrest ≳ 50 µm) with a modified black bod…
Fluorine in the solar neighbourhood: modelling the Galactic thick and thin discs
Ryde, N.; Jönsson, H.; Matteucci, F. +3 more
We investigate the evolution of the abundance of fluorine in the Milky Way thick and thin discs by means of detailed chemical evolution models compared with recent observational data. The chemical evolution models adopted here have already been shown to fit the observed abundance patterns of CNO and α-elements as well as the metallicity distributi…
Trans-Neptunian Objects Found in the First Four Years of the Dark Energy Survey
Smith, M.; Abbott, T. M. C.; Brooks, D. +62 more
We present a catalog of 316 trans-Neptunian bodies (TNOs) detected from the first four seasons ("Y4" data) of the Dark Energy Survey (DES). The survey covers a contiguous 5000 deg2 of the southern sky in the grizY optical/NIR filter set, with a typical TNO in this part of the sky being targeted by 25-30 Y4 exposures. This paper focuses …
Noninteracting Black Hole Binaries with Gaia and LAMOST
Liu, Jifeng; Wiktorowicz, Grzegorz; Lu, Youjun +4 more
Until recently, black holes (BHs) could be discovered only through accretion from other stars in X-ray binaries, or in merging double compact objects. Improvements in astrometric and spectroscopic measurements have made it possible to detect BHs also in noninteracting BH binaries (nBHBs) through a precise analysis of the companion's motion. In thi…
Space Telescope and Optical Reverberation Mapping Project. XII. Broad-line Region Modeling of NGC 5548
Im, M.; Fox, O. D.; Malkan, M. A. +155 more
We present geometric and dynamical modeling of the broad line region (BLR) for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The data set includes photometric and spectroscopic monitoring in the optical and ultraviolet, covering the Hβ, C IV, and Lyα broad emission lines. We find an extended disk-like Hβ BLR with…
Automatic classification of plasma regions in near-Earth space with supervised machine learning: application to Magnetospheric Multi Scale 2016-2019 observation
Breuillard, Hugo; Lapenta, Giovanni; Dupuis, Romain +3 more
The proper classification of plasma regions in near-Earth space is crucial to perform unambiguous statistical studies of fundamental plasma processes such as shocks, magnetic reconnection, waves and turbulence, jets and their combinations. The majority of available studies have been performed by using human-driven methods, such as visual data sele…
HST/COS Observations of Quasar Outflows in the 500-1050 Å Rest Frame. I. The Most Energetic Outflows in the Universe and Other Discoveries
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +2 more
The Hubble Space Telescope/Cosmic Origins Spectrograph (COS) has opened a new discovery space for studying quasar absorption outflows and their contribution to active galactic nucleus (AGN) feedback. Specifically, COS provides high-quality far-ultraviolet (FUV) spectra covering the diagnostic-rich 500-1050 Å rest frame (hereafter, EUV500) of mediu…
The e-MERGE Survey (e-MERLIN Galaxy Evolution Survey): overview and survey description
Guidetti, D.; Bondi, M.; Prandoni, I. +37 more
We present an overview and description of the e-MERGE Survey (e-MERLIN Galaxy Evolution Survey) Data Release 1 (DR1), a large program of high-resolution 1.5-GHz radio observations of the GOODS-N field comprising ∼140 h of observations with enhanced-Multi-Element Remotely Linked Interferometer Network (e-MERLIN) and ∼40 h with the Very Large Array …
Reconnection- and Dipolarization-Driven Auroral Dawn Storms and Injections
Bonfond, B.; Vogt, M. F.; Mauk, B. H. +8 more
Jupiter displays many distinct auroral structures, among which auroral dawn storms and auroral injections are often observed contemporaneously. However, it is unclear if the contemporaneous nature of the observations is a coincidence or part of an underlying physical connection. We show six clear examples from a recent Hubble Space Telescope campa…