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A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst
Kilpatrick, Charles D.; Lee, Chung-Uk; Im, Myungshin +24 more
Observationally, kilonovae are astrophysical transients powered by the radioactive decay of nuclei heavier than iron, thought to be synthesized in the merger of two compact objects1-4. Over the first few days, the kilonova evolution is dominated by a large number of radioactive isotopes contributing to the heating rate2,5. On…
Accelerated formation of ultra-massive galaxies in the first billion years
Dickinson, Mark; Illingworth, Garth D.; Labbé, Ivo +35 more
Recent James Webb Space Telescope (JWST) observations have revealed an unexpected abundance of massive-galaxy candidates in the early Universe, extending further in redshift and to lower luminosity than what had previously been found by submillimetre surveys1–6. These JWST candidates have been interpreted as challenging the Λ cold dark-…
A parsec-scale Galactic 3D dust map out to 1.25 kpc from the Sun
Speagle, Joshua S.; Zucker, Catherine; Finkbeiner, Douglas +4 more
Context. High-resolution 3D maps of interstellar dust are critical for probing the underlying physics shaping the structure of the interstellar medium, and for foreground correction of astrophysical observations affected by dust.
Aims: We aim to construct a new 3D map of the spatial distribution of interstellar dust extinction out to a distan…
Low-mass bursty galaxies in JADES efficiently produce ionizing photons and could represent the main drivers of reionization
Maiolino, R.; Sun, F.; Egami, E. +21 more
We use deep imaging from the JWST Advanced Deep Extragalactic Survey (JADES) to study the evolution of the ionizing photon production efficiency, ξion. We estimate ξion for a sample of 677 galaxies at z ~ 4-9 using NIRCam (Near-Infrared Camera) photometry. Specifically, combinations of the medium and wide bands F335M-F356W an…
Enhanced Subkiloparsec-scale Star Formation: Results from a JWST Size Analysis of 341 Galaxies at 5 < z < 14
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +7 more
We present a comprehensive search and analysis of high-redshift galaxies in a suite of nine public JWST extragalactic fields taken in Cycle 1, covering a total effective search area of $\sim 358\,{\mathrm{arcmin}}^{2}$ . Through conservative (8σ) photometric selection, we identify 341 galaxies at 5 < z < 14, with 109 having spectroscopic red…
A massive galaxy that formed its stars at z ≈ 11
Papovich, Casey; Kacprzak, Glenn G.; Glazebrook, Karl +15 more
The formation of galaxies by gradual hierarchical co-assembly of baryons and cold dark matter halos is a fundamental paradigm underpinning modern astrophysics1,2 and predicts a strong decline in the number of massive galaxies at early cosmic times3-5. Extremely massive quiescent galaxies (stellar masses of more than 1011…
EIGER. V. Characterizing the Host Galaxies of Luminous Quasars at z ≳ 6
Simcoe, Robert A.; Naidu, Rohan P.; Kashino, Daichi +6 more
We report JWST/NIRCam measurements of quasar host galaxy emissions and supermassive black hole (SMBH) masses for six quasars at 5.9 < z < 7.1 in the Emission-line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project. We obtain deep NIRCam imaging in the F115W, F200W, and F356W bands, as well as F356W grism spectroscopy…
Galaxy build-up in the first 1.5 Gyr of cosmic history: insights from the stellar mass function at z 4-9 from JWST NIRCam observations
Pérez-González, Pablo G.; Santini, Paola; Dickinson, Mark +28 more
Combining the public JWST/NIRCam imaging programs CEERS, PRIMER, and JADES, spanning a total area of $\sim 500\, {\rm arcmin}^2$, we obtain a sample of $\gt $30 000 galaxies at $z_{\rm phot}\sim 4\!-\!9$ that allows us to perform a complete, rest-optical-selected census of the galaxy population at $z\gt 3$. Comparing the stellar mass $M_*$ and the…
Between the Extremes: A JWST Spectroscopic Benchmark for High-redshift Galaxies Using ∼500 Confirmed Sources at z ≥ 5
Castellano, Marco; Fontana, Adriano; Pentericci, Laura +6 more
The exceptional spectra of the most luminous z > 10 sources observed so far have challenged our understanding of early galaxy evolution, requiring a new observational benchmark for meaningful interpretation. As such, we construct spectroscopic templates representative of high-redshift, star-forming populations, using 482 confirmed sources at z …
The JWST EXCELS survey: too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5
Cimatti, A.; Cullen, F.; McLure, R. J. +21 more
We report ultra-deep, medium-resolution spectroscopic observations for four quiescent galaxies with log