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RELICS: The Reionization Lensing Cluster Survey and the Brightest High-z Galaxies
Frye, Brenda L.; Strait, Victoria; Lovisari, Lorenzo +32 more
Massive foreground galaxy clusters magnify and distort the light of objects behind them, permitting a view into both the extremely distant and intrinsically faint galaxy populations. We present here the $z\sim 6\mbox{--}8$ candidate high-redshift galaxies from the Reionization Lensing Cluster Survey (RELICS), a Hubble and Spitzer Space Telescope s…
Keeping It Cool: Much Orbit Migration, yet Little Heating, in the Galactic Disk
Ting, Yuan-Sen; Rix, Hans-Walter; Frankel, Neige +1 more
A star in the Milky Way's disk can now be at a Galactocentric radius quite distant from its birth radius for two reasons: either its orbit has become eccentric through radial heating, which increases its radial action JR ("blurring"), or merely its angular momentum Lz has changed and thereby its guiding radius ("churning"). W…
Magnetohydrodynamic and kinetic scale turbulence in the near-Earth space plasmas: a (short) biased review
Sahraoui, Fouad; Huang, Shiyong; Hadid, Lina
The near-Earth space is a unique laboratory to explore turbulence and energy dissipation processes in magnetized plasmas thanks to the availability of high-quality data from various orbiting spacecraft, such as Wind, Stereo, Cluster, Themis, and the more recent one, the NASA Magnetospheric Multiscale (MMS) mission. In comparison with the solar win…
Galaxy And Mass Assembly (GAMA): a forensic SED reconstruction of the cosmic star formation history and metallicity evolution by galaxy type
Hopkins, Andrew M.; Driver, Simon P.; Robotham, Aaron S. G. +9 more
We apply the spectral energy distribution (SED) fitting code PROSPECT to multiwavelength imaging for ∼7000 galaxies from the GAMA survey at z < 0.06, in order to extract their star formation histories. We combine a parametric description of the star formation history with a closed-box evolution of metallicity where the present-day gas-phase met…
TESS Hunt for Young and Maturing Exoplanets (THYME). III. A Two-planet System in the 400 Myr Ursa Major Group
Gagliano, Robert; Kristiansen, Martti H.; LaCourse, Daryll M. +51 more
Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, and structures are shaped by their environment. Young planets (<1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where planets evolve the fastest. However, most of the known young planets orbit prohibitively faint stars…
Direct confirmation of the radial-velocity planet β Pictoris c
Genzel, R.; Sturm, E.; Tacconi, L. J. +92 more
Context. Methods used to detect giant exoplanets can be broadly divided into two categories: indirect and direct. Indirect methods are more sensitive to planets with a small orbital period, whereas direct detection is more sensitive to planets orbiting at a large distance from their host star. This dichotomy makes it difficult to combine the two t…
Meridional flow in the Sun’s convection zone is a single cell in each hemisphere
Gizon, Laurent; Cameron, Robert H.; Liang, Zhi-Chao +4 more
The Sun’s magnetic field is generated by subsurface motions of the convecting plasma. The latitude at which the magnetic field emerges through the solar surface (as sunspots) drifts toward the equator over the course of the 11-year solar cycle. We use helioseismology to infer the meridional flow (in the latitudinal and radial directions) over two …
A dynamic black hole corona in an active galaxy through X-ray reverberation mapping
Fabian, Andrew C.; Middleton, Matthew J.; Walton, Dominic J. +18 more
X-ray reverberation echoes are assumed to be produced in the strongly distorted spacetime around accreting supermassive black holes. This signal allows us to spatially map the geometry of the inner accretion flow1,2—a region that cannot yet be spatially resolved by any telescope—and provides a direct measure of the black hole mass and s…
The Lyman Continuum Escape Survey. II. Ionizing Radiation as a Function of the [O III]/[O II] Line Ratio
Tang, Mengtao; Stark, Daniel P.; Ellis, Richard S. +2 more
We discuss the rest-frame optical emission line spectra of a large (∼50) sample of z ∼ 3.1 Lyα emitting galaxies (LAEs) whose physical properties suggest such sources are promising analogs of galaxies in the reionization era. Reliable Lyman continuum (LyC) escape fractions have now been determined for a large sample of such LAEs from the LymAn Con…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. XI. Accretion Disk Reverberation Mapping of Mrk 142
Ho, Luis C.; Barth, Aaron J.; Horne, Keith +15 more
We performed an intensive accretion disk reverberation mapping campaign on the high accretion rate active galactic nucleus Mrk 142 in early 2019. Mrk 142 was monitored with the Neil Gehrels Swift Observatory for four months in X-rays and six different UV/optical filters. Ground-based photometric monitoring was obtained from the Las Cumbres Observa…