Search Publications
Chemical Cartography of the Sagittarius Stream with Gaia
Price-Whelan, Adrian M.; Ness, Melissa K.; Johnston, Kathryn V. +5 more
The stellar stream connected to the Sagittarius (Sgr) dwarf galaxy is the most massive tidal stream that has been mapped in the Galaxy, and is the dominant contributor to the outer stellar halo of the Milky Way (MW). We present metallicity maps of the Sgr stream, using 34,240 red giant branch stars with inferred metallicities from Gaia BP/RP spect…
The Mass of the Large Magellanic Cloud from the Three-dimensional Kinematics of Its Globular Clusters
van der Marel, Roeland P.; Watkins, Laura L.; Bennet, Paul
We estimate the mass of the Large Magellanic Cloud (LMC) using the kinematics of 30 LMC globular clusters (GCs). We combine proper motions measured with the Hubble Space Telescope, Gaia, or a combination of the two, from a recent study by Bennet et al. with literature line-of-sight velocities (LOSVs) to give three components of motion. With these,…
Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova
Temim, Tea; Filippenko, Alexei V.; Coulter, David A. +78 more
We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar "03fg-like" (or "super-Chandrasekhar") Type Ia supernova (SN Ia), in the nebular phase at 338 days postexplosion. Our combined spectrum continuously covers 0.4–14 µm and includes the first mid-infrared spectrum of a 03fg-like SN Ia. Compared to normal SN I…
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…
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…
Dynamics of a Galaxy at z > 10 Explored by JWST Integral Field Spectroscopy: Hints of Rotating Disk Suggesting Weak Feedback
Ono, Yoshiaki; Ouchi, Masami; Harikane, Yuichi +9 more
We investigate the dynamics of GN-z11, a luminous galaxy at z = 10.60, carefully analyzing the public deep integral field spectroscopy (IFS) data taken with the JWST NIRSpec integral field unit. While the observations of the IFS data originally targeted an He II clump near GN-z11, we find that the C III] λ λ1907, 1909 emission from ionized gas at …
Precision MARS Mass Reconstruction of A2744: Synergizing the Largest Strong-lensing and Densest Weak-lensing Data Sets from JWST
Jee, M. James; Cha, Sangjun; HyeongHan, Kim +2 more
We present a new high-resolution free-form mass model of A2744 that combines both weak-lensing (WL) and strong-lensing (SL) data sets from JWST. The SL data set comprises 286 multiple images, presenting the most extensive SL constraint to date for a single cluster. The WL data set, employing photo-z selection, yields a source density of $\sim 350\…
Dead or Alive? How Bursty Star Formation and Patchy Dust Can Cause Temporary Quiescence in High-redshift Galaxies
Morishita, Takahiro; Faisst, Andreas L.
The recent discovery of a galaxy at z = 7.3 with undetected optical emission lines and a blue UV-to-optical continuum ratio in JWST spectroscopy is surprising and needs to be explained physically. Here, we explore two possibilities that could cause such a seemingly quiescent ∼5 × 108 M ⊙ galaxy in the early Universe: (i) stoc…
JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b
Eastman, Jason D.; Bean, Jacob L.; Zhang, Michael +9 more
We present thermal emission measurements of GJ 1132b spanning 5–12 µm obtained with the Mid-Infrared Instrument Low-Resolution Spectrometer on the James Webb Space Telescope. GJ 1132b is an M dwarf rocky planet with T eq = 584 K and an orbital period of 1.6 days. We measure a white-light secondary eclipse depth of 140 ± 17 ppm, wh…