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Gas conditions of a star-formation selected sample in the first billion years
Carniani, Stefano; Fujimoto, Seiji; Vallini, Livia +20 more
We present Atacama Large Millimetre/submillimetre Array (ALMA) observations of the [O III] 88 $\mu {\rm m}$ emission of a sample of thirteen galaxies at $z = 6$ to 7.6 selected as [C II]-emitting companion sources of quasars. To disentangle the origins of the luminous Oxygen line in the $z\, \gt\, 6$ Universe, we looked at emission-line galaxies t…
NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes
Djorgovski, S. G.; Connor, Thomas; Walton, Dominic J. +12 more
We present an analysis of NuSTAR X-ray observations of three active galactic nuclei (AGN) that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey based on apparent periodicity in their optical light curves. Simulations predict that close-separation accreting SMBH binaries…
Runaway OB Stars in the Small Magellanic Cloud. III. Updated Kinematics and Insights into Dynamical versus Supernova Ejections
Oey, M. S.; Phillips, Grant D.; Cuevas, Maria +2 more
We use the kinematics of field OB stars to estimate the frequencies of runaway stars generated by the dynamical ejection scenario (DES), the binary supernova scenario (BSS), and the combined two-step mechanism. We update the proper motions for field OB and OBe stars in the Small Magellanic Cloud (SMC) using Gaia DR3. Our sample now contains 336 st…
CLASSY. X. Highlighting Differences between Partial Covering and Semianalytic Modeling in the Estimation of Galactic Outflow Properties
Martin, Crystal L.; Charlot, Stéphane; Skillman, Evan D. +17 more
Feedback-driven massive outflows play a crucial role in galaxy evolution by regulating star formation and influencing the dynamics of surrounding media. Extracting outflow properties from spectral lines is a notoriously difficult process for a number of reasons, including the possibility that a substantial fraction of the outflow is carried by den…
Chemical abundances and deviations from the solar S/O ratio in the gas-phase interstellar medium of galaxies based on infrared emission lines
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +3 more
Context. The infrared (IR) range is extremely useful in the context of chemical abundance studies of the gas-phase interstellar medium (ISM) due to the large variety of ionic species traced in this regime, the negligible effects from dust attenuation or temperature stratification, and the amount of data that has been and will be released in the co…
A-SLOTH reveals the nature of the first stars
Glover, Simon C. O.; Klessen, Ralf S.; Hartwig, Tilman +1 more
The first generation of stars (Pop III) are too dim to be observed directly and probably too short-lived to have survived for local observations. Hence, we rely on simulations and indirect observations to constrain the nature of the first stars. In this study, we calibrate the semi-analytical model A-SLOTH (Ancient Stars and Local Observables by T…
Double "acct": A Distinct Double-peaked Supernova Matching Pulsational Pair Instability Models
Rest, A.; Angus, C. R.; Foley, R. J. +35 more
We present multiwavelength data of SN 2020acct, a double-peaked stripped-envelope supernova (SN) in NGC 2981 at ∼150 Mpc. The two peaks are temporally distinct, with maxima separated by 58 rest-frame days and a factor of 20 reduction in flux between. The first is luminous (Mr = ‑18.00 ± 0.02 mag) and blue (g ‑ r = 0.27 ± 0.03 mag) and d…
The frequency of metal enrichment of cool helium-atmosphere white dwarfs using the DESI early data release
Brooks, D.; Doel, P.; Honscheid, K. +35 more
There is an overwhelming evidence that white dwarfs host planetary systems; revealed by the presence, disruption, and accretion of planetary bodies. A lower limit on the frequency of white dwarfs that host planetary material has been estimated to be ≃ 25-50 per cent; inferred from the ongoing or recent accretion of metals on to both hydrogen-atmos…
Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy
Henning, Thomas; Usuda, Tomonori; Hellier, Coel +103 more
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low insolation is still small, limiting our ability to understand the diversity of the atmospheric composition and …
What Is Missing from the Local Stellar Halo?
Conroy, Charlie; Naidu, Rohan P.; Sharpe, Katherine
The Milky Way's stellar halo, which extends to >100 kpc, encodes the evolutionary history of our Galaxy. However, most studies of the halo to date have been limited to within a few kiloparsecs of the Sun. Here, we characterize differences between this local halo and the stellar halo in its entirety. We construct a composite stellar halo model b…