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\mathrm{SQuIGG}ěc{L}{E} : Studying Quenching in Intermediate-z Galaxies-Gas, \mathrm{Angu}ěc{L}\mathrm{ar} Momentum, and Evolution
Johnson, Benjamin D.; Bezanson, Rachel; Kriek, Mariska +12 more
We describe the Studying Quenching in Intermediate-z Galaxies: Gas, ${\rm{angu}}\overrightarrow{L}{\rm{ar}}$ momentum, and Evolution ( $\mathrm{SQuIGG}\vec{L}{\rm{E}}$ ) survey of intermediate-redshift post-starburst galaxies. We leverage the large sky coverage of the Sloan Digital Sky Survey to select ~ 1300 recently quenched galaxies at 0.5 <…
Upper mass-loss limits and clumping in the intermediate and outer wind regions of OB stars
Puls, J.; Najarro, F.; Traficante, A. +4 more
Context. Mass loss is a key parameter throughout the evolution of massive stars, and it determines the feedback with the surrounding interstellar medium. The presence of inhomogeinities in stellar winds (clumping) leads to severe discrepancies not only among different mass-loss rate diagnostics, but also between empirical estimates and theoretical…
The Cosmic Telescope That Lenses the Sunburst Arc, PSZ1 G311.65-18.48: Strong Gravitational Lensing Model and Source Plane Analysis
Mahler, Guillaume; Rigby, Jane R.; Sharon, Keren +12 more
We present a strong-lensing analysis of the cluster PSZ1 G311.65-18.48, based on Hubble Space Telescope imaging, archival VLT/MUSE spectroscopy, and Chandra X-ray data. This cool-core cluster (z = 0.443) lenses the brightest lensed galaxy known, dubbed the "Sunburst Arc" (z = 2.3703), a Lyman continuum (LyC) emitting galaxy multiply imaged 12 time…
The VISCACHA survey - IV. The SMC West Halo in 8D
Minniti, D.; Geisler, D.; Bica, E. +18 more
The structure of the Small Magellanic Cloud (SMC) is very complex, in particular in the periphery that suffers more from the interactions with the Large Magellanic Cloud (LMC). A wealth of observational evidence has been accumulated revealing tidal tails and bridges made up of gas, stars, and star clusters. Nevertheless, a full picture of the SMC …
The Local Stellar Halo is Not Dominated by a Single Radial Merger Event
Kim, Bokyoung; Lépine, Sebastien; Newberg, Heidi Jo +1 more
We use halo dwarf stars with photometrically determined metallicities that are located within 2 kpc of the Sun to identify local halo substructure. The kinematic properties of these stars do not indicate a single, dominant radial merger event (RME). The retrograde Virgo Radial Merger (VRM) component has [Fe/H] = -1.7. A second, nonrotating RME com…
RESOLVE and ECO: Finding Low-metallicity z 0 Dwarf AGN Candidates Using Optimized Emission-line Diagnostics
Moffett, Amanda J.; Kannappan, Sheila J.; Norris, Mark A. +6 more
Existing star-forming vs. active galactic nucleus (AGN) classification schemes using optical emission-line diagnostics mostly fail for low-metallicity and/or highly star-forming galaxies, missing AGN in typical z ~ 0 dwarfs. To recover AGN in dwarfs with strong emission lines (SELs), we present a classification scheme optimizing the use of existin…
Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars
Gies, Douglas R.; Wang, Luqian; Klement, Robert +17 more
Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O- or B-type subdwarf (sdO/sdB), and the mass gainer spins up and grows a disk to become a Be star. While several Be+sdO binaries have been identified, dynamical masses and other fundamental parameters are available only for a single…
Substructure at High Speed. II. The Local Escape Velocity and Milky Way Mass with Gaia eDR3
Necib, Lina; Lin, Tongyan
Measuring the escape velocity of the Milky Way is critical in obtaining the mass of the Milky Way, understanding the dark matter velocity distribution, and building the dark matter density profile. In Necib & Lin, we introduced a strategy to robustly measure the escape velocity. Our approach takes into account the presence of kinematic substru…
Using AGN light curves to map accretion disc temperature fluctuations
Kochanek, C. S.; Neustadt, J. M. M.
We introduce a new model for understanding AGN continuum variability. We start from a Shakura-Sunyaev thin accretion disc with a steady-state radial temperature profile T(R) and assume that the variable flux is due to axisymmetric temperature perturbations δT(R, t). After linearizing the equations, we fit UV-optical AGN light curves to determine δ…
An Aligned Orbit for the Young Planet V1298 Tau b
Berlind, Perry; Calkins, Michael L.; Esquerdo, Gilbert A. +22 more
The alignment of planetary orbits with respect to the stellar rotation preserves information on their dynamical histories. Measuring this angle for young planets helps illuminate the mechanisms that create misaligned orbits for older planets, as different processes could operate over timescales ranging from a few megayears to a gigayear. We presen…