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JWST Insight into a Lensed HST-dark Galaxy and Its Quiescent Companion at z = 2.58
Fujimoto, Seiji; Kohno, Kotaro; Trebitsch, Maxime +13 more
Using the novel James Webb Space Telescope (JWST)/NIRCam observations in the A2744 field, we present a first spatially resolved overview of a Hubble Space Telescope (HST)-dark galaxy, spectroscopically confirmed at z = 2.58 with magnification µ ≈ 1.9. While being largely invisible at ~1 µm with NIRCam, except for sparse clumpy substruc…
The stellar mass of the Gaia-Sausage/Enceladus accretion remnant
Bovy, Jo; Lane, James M. M.; Mackereth, J. Ted
The Gaia-Sausage/Enceladus (GS/E) structure is an accretion remnant that comprises a large fraction of the Milky Way's stellar halo. We study GS/E using high-purity samples of kinematically selected stars from APOGEE DR16 and Gaia. Employing a novel framework to account for kinematic selection biases using distribution functions, we fit density pr…
A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
Fruchter, Andrew S.; Heintz, Kasper E.; Jonker, Peter G. +29 more
The majority of long-duration (>2 s) gamma-ray bursts (GRBs) arise from the collapse of massive stars, with a small proportion created from the merger of compact objects. Most of these systems form via standard stellar evolution pathways. However, a fraction of GRBs may result from dynamical interactions in dense environments. These channels co…
Polarization Properties of the Weakly Magnetized Neutron Star X-Ray Binary GS 1826-238 in the High Soft State
Wu, Kinwah; Enoto, Teruaki; Turolla, Roberto +94 more
The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on 2021 December 9 has opened a new window in X-ray astronomy. We report here the results of the first IXPE observation of a weakly magnetized neutron star, GS 1826-238, performed on 2022 March 29-31 when the source was in a high soft state. An upper limit (99.73% confidence level) of 1.3…
Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion Mass
Macintosh, Bruce; Perrin, Marshall D.; Barman, Travis S. +6 more
The carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that a number of exoplanets have measured C/O ratios, it is possible to examine this diagnostic at a population level. Here, we present an analysis of currently measured C/O ratios of directly imaged and transit/eclipse…
Constraining resonant dark matter self-interactions with strong gravitational lenses
Bovy, Jo; Gilman, Daniel; Zhong, Yi-Ming
We devise a method to constrain self-interacting dark matter (SIDM) from observations of quadruply imaged quasars, and apply it to five self-interaction potentials with a long-range dark force. We consider several SIDM models with an attractive potential that allows for the formation of quasibound states, giving rise to resonant features in the cr…
Beyond UVJ: Color Selection of Galaxies in the JWST Era
Papovich, Casey; Martis, Nicholas S.; Muzzin, Adam +8 more
We present a new rest-frame color-color selection method using synthetic u s - g s and g s - i s , (ugi) s colors to identify star-forming and quiescent galaxies. Our method is similar to the widely used U - V versus V - J (UVJ) diagram. However, UVJ suffers known systematics. Spectros…
An updated measurement of the Hubble constant from near-infrared observations of Type Ia supernovae
Leibundgut, B.; Galbany, L.; Dhawan, S. +12 more
We present a measurement of the Hubble constant (H0) using type Ia supernovae (SNe Ia) in the near-infrared (NIR) from the recently updated sample of SNe Ia in nearby galaxies with distances measured via Cepheid period-luminosity relations by the SH0ES project. We collected public near-infrared photometry of up to 19 calibrator SNe Ia a…
First Results from the JWST Early Release Science Program Q3D: Ionization Cone, Clumpy Star Formation, and Shocks in a z = 3 Extremely Red Quasar Host
Johnson, Sean D.; Lützgendorf, Nora; Hamann, Fred +25 more
Massive galaxies formed most actively at redshifts z = 1-3 during the period known as "cosmic noon." Here we present an emission-line study of the extremely red quasar SDSSJ165202.64+172852.3's host galaxy at z = 2.94, based on observations with the Near Infrared Spectrograph integral field unit on board JWST. We use standard emission-line diagnos…
Wide Binaries from GAIA EDR3: preference for GR over MOND?
Sutherland, Will; Pittordis, Charalambos
Several recent studies have shown that velocity differences of very wide binary stars, measured to high precision with GAIA, can potentially provide an interesting test for modified-gravity theories which attempt to emulate dark matter. These systems should be entirely Newtonian according to standard dark-matter theories, while the predictions for…