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Dark Energy Survey year 3 results: point spread function modelling
Bechtol, K.; Smith, M.; Abbott, T. M. C. +79 more
We introduce a new software package for modelling the point spread function (PSF) of astronomical images, called PIFF (PSFs In the Full FOV), which we apply to the first three years (known as Y3) of the Dark Energy Survey (DES) data. We describe the relevant details about the algorithms used by PIFF to model the PSF, including how the PSF model va…
Characterizing Extreme Emission-line Galaxies. I. A Four-zone Ionization Model for Very High-ionization Emission
Skillman, Evan D.; Chisholm, John; Erb, Dawn K. +3 more
Stellar population models produce radiation fields that ionize oxygen up to O+2, defining the limit of standard H II region models (<54.9 eV). Yet, some extreme emission-line galaxies, or EELGs, have surprisingly strong emission originating from much higher ionization potentials. We present UV HST/COS and optical LBT/MODS spectra of …
Dissecting the Local Environment of FRB 190608 in the Spiral Arm of its Host Galaxy
Chittidi, Jay S.; Simha, Sunil; Mannings, Alexandra +15 more
We present a high-resolution analysis of the host galaxy of fast radio burst (FRB) 190608, an SB(r)c galaxy at z = 0.11778 (hereafter HG 190608), to dissect its local environment and its contributions to the FRB properties. Our Hubble Space Telescope Wide Field Camera 3 ultraviolet and visible light image reveals that the subarcsecond localization…
Transit detection of the long-period volatile-rich super-Earth ν2 Lupi d with CHEOPS
Charnoz, Sébastien; Guedel, Manuel; Gandolfi, Davide +75 more
Exoplanets transiting bright nearby stars are key objects for advancing our knowledge of planetary formation and evolution. The wealth of photons from the host star gives detailed access to the atmospheric, interior and orbital properties of the planetary companions. ν2 Lupi (HD 136352) is a naked-eye (V = 5.78) Sun-like star that was d…
A cool and inflated progenitor candidate for the Type Ib supernova 2019yvr at 2.6 yr before explosion
Kilpatrick, Charles D.; Drout, Maria R.; Foley, Ryan J. +13 more
We present Hubble Space Telescope imaging of a pre-explosion counterpart to SN 2019yvr obtained 2.6 yr before its explosion as a type Ib supernova (SN Ib). Aligning to a post-explosion Gemini-S/GSAOI image, we demonstrate that there is a single source consistent with being the SN 2019yvr progenitor system, the second SN Ib progenitor candidate aft…
Investigating the young AU Mic system with SPIRou: large-scale stellar magnetic field and close-in planet mass
Gaidos, Eric; Doyon, René; Donati, Jean-François +12 more
We present a velocimetric and spectropolarimetric analysis of 27 observations of the 22-Myr M1 star AU Microscopii (AU Mic) collected with the high-resolution YJHK (0.98-2.35 µm) spectropolarimeter SPIRou from 2019 September 18 to November 14. Our radial velocity (RV) time-series exhibits activity-induced fluctuations of 45 m s-1 …
APOGEE DR16: A multi-zone chemical evolution model for the Galactic disc based on MCMC methods
Calura, F.; Palla, M.; Matteucci, F. +6 more
Context. The analysis of the latest release of the Apache Point Observatory Galactic Evolution Experiment project (APOGEE DR16) data suggests the existence of a clear distinction between two sequences of disc stars at different Galactocentric distances in the [α/Fe] versus [Fe/H] abundance ratio space: the so-called high-α sequence, classically as…
The Hi-GAL compact source catalogue - II. The 360° catalogue of clump physical properties
Martin, P. G.; Paladini, R.; Pilbratt, G. L. +29 more
We present the 360° catalogue of physical properties of Hi-GAL compact sources, detected between 70 and 500 $\mu$m. This release not only completes the analogous catalogue previously produced by the Hi-GAL collaboration for -71° ≲ ℓ ≲ 67°, but also meaningfully improves it because of a new set of heliocentric distances, 120 808 in total. About a t…
Primordial black holes and scalar-induced secondary gravitational waves from inflationary models with a noncanonical kinetic term
Gao, Qing; Gong, Yungui; Yi, Zhu +1 more
With the enhancement mechanism provided by a noncanonical kinetic term with a peak, the amplitude of primordial curvature perturbations can be enhanced by seven orders of magnitude at small scales while keeping to be consistent with observations at large scales. The peak function and inflationary potential are not restricted in this mechanism. We …
Turbulent Gas in Lensed Planck-selected Starbursts at z ∼ 1-3.5
Frayer, D. T.; Frye, B. L.; Jiménez-Andrade, E. F. +26 more
Dusty star-forming galaxies at high redshift (1 < z < 3) represent the most intense star-forming regions in the universe. Key aspects to these processes are the gas heating and cooling mechanisms, and although it is well known that these galaxies are gas-rich, little is known about the gas excitation conditions. Only a few detailed radiative…