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Ly α emission in low-redshift most metal-deficient compact star-forming galaxies
Schaerer, D.; Thuan, T. X.; Izotov, Y. I. +3 more
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of nine most metal-deficient compact star-forming galaxies with oxygen abundances 12 + log(O/H) = 6.97-7.23, redshifts z = 0.02811-0.13320, and stellar masses M⋆ ≤ 107 M⊙. We aim to study the properties of Ly α emission …
Geological evidence for multiple climate transitions on Early Mars
Kite, Edwin S.; Conway, Susan
Landforms and deposits observed on the Martian surface suggest that Mars' early climate supported rivers and lakes over a time span of more than a billion years. But, like Earth, which has over the past billion years experienced periods of global glaciations and hyperthermals, the climate history of Early Mars may have been intermittent. Here we s…
A first look at spatially resolved star formation at 4.8 < z < 6.5 with JWST FRESCO NIRCam slitless spectroscopy
Matharu, Jasleen; Chisholm, John; Shivaei, Irene +19 more
We present the first results on the spatial distribution of star formation in 454 star-forming galaxies just after the epoch of reionisation (4.8 < z < 6.5) using Hα emission-line maps and F444W imaging that traces the stellar continuum from the JWST FRESCO NIRCam Slitless Spectroscopy Survey. The Hα equivalent width profiles of star-forming…
Spectacular Nucleosynthesis from Early Massive Stars
Bizyaev, Dmitry; Brownstein, Joel R.; Pan, Kaike +39 more
Stars that formed with an initial mass of over 50 M ⊙ are very rare today, but they are thought to be more common in the early Universe. The fates of those early, metal-poor, massive stars are highly uncertain. Most are expected to directly collapse to black holes, while some may explode as a result of rotationally powered engines or th…
Discovery of an Apparent Red, High-velocity Type Ia Supernova at z = 2.9 with JWST
Maiolino, R.; Fox, O. D.; Rest, A. +27 more
We present the James Webb Space Telescope (JWST) discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS+53.13485‑27.82088 with a host spectroscopic redshift of 2.903 ± 0.007. The transient was identified in deep (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectrosc…
The SRG/eROSITA All-Sky Survey. SRG/eROSITA cross-calibration with Chandra and XMM-Newton using galaxy cluster gas temperatures
Zhang, X.; Pacaud, F.; Ramos-Ceja, M. E. +17 more
Galaxy cluster gas temperatures (T) play a crucial role in many cosmological and astrophysical studies. However, it has been shown that T measurements can significantly vary between different X-ray telescopes. These T biases can propagate to several cluster applications in which T can be used, such as measuring hydrostatic cluster masses and const…
Statistical study of a large and cleaned sample of ultraluminous and hyperluminous X-ray sources
Godet, Olivier; Tranin, Hugo; Webb, Natalie +1 more
Context. Ultraluminous and hyperluminous X-ray (ULX and HLX) sources could constitute interesting laboratories to further improve our understanding of the supermassive black hole growth through super-Eddington accretion episodes and successive mergers of lighter holes. ULXs are thought to be powered by super-Eddington accretion onto stellar-mass c…
An ALMA Spectroscopic Survey of the Brightest Submillimeter Galaxies in the SCUBA-2-COSMOS Field (AS2COSPEC): Physical Properties of z = 2–5 Ultra- and Hyperluminous Infrared Galaxies
Smail, Ian; Ao, Y.; Swinbank, A. M. +11 more
We report the physical properties of the 18 brightest (S 870 µm = 12.4–19.2 mJy) and not strongly lensed 870 µm–selected dusty star-forming galaxies (DSFGs), also known as submillimeter galaxies (SMGs), in the COSMOS field. This sample is part of an ALMA band 3 spectroscopic survey (AS2COSPEC), and spectroscopic redshifts ar…
Exploring a primordial solution for early black holes detected with JWST
Dayal, Pratika
Aims. With its rest-frame optical sensitivity, the James Webb Space Telescope (JWST) has unearthed black holes as massive as 106.2‑8.1 M⊙ at redshifts of z ∼ 8.5 ‑ 10.6. In addition to these unexpectedly high masses, many systems show unexpectedly high ratios of the black hole to stellar mass of MBH/M* ≳…
TESS Hunt for Young and Maturing Exoplanets (THYME). XI. An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +32 more
Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433 d—a nearby (22 pc), Earth-sized planet transiting a young Sun-like star (TOI-1726, HD 63433). HD 63433 d is the third planet detected in this multiplanet system. The kinematic, rotational, and …