Search Publications
MIDIS: Strong (Hβ+[O III]) and Hα Emitters at Redshift z ≃ 7-8 Unveiled with JWST NIRCam and MIRI Imaging in the Hubble eXtreme Deep Field
Ilbert, O.; Östlin, G.; Güdel, M. +44 more
We make use of JWST medium-band and broadband NIRCam imaging, along with ultradeep MIRI 5.6 µm imaging, in the Hubble eXtreme Deep Field to identify prominent line emitters at z ≃ 7-8. Out of a total of 58 galaxies at z ≃ 7-8, we find 18 robust candidates (≃31%) for (Hβ + [O III]) emitters, based on their enhanced fluxes in the F430M and F44…
GOALS-JWST: Mid-infrared Spectroscopy of the Nucleus of NGC 7469
Malkan, M. A.; Inami, H.; Murphy, E. J. +32 more
We present mid-infrared spectroscopic observations of the nucleus of the nearby Seyfert galaxy NGC 7469 taken with the MIRI instrument on the James Webb Space Telescope (JWST) as part of Directors Discretionary Time Early Release Science program 1328. The high-resolution nuclear spectrum contains 19 emission lines covering a wide range of ionizati…
Possible Detection of the Progenitor of the Type II Supernova SN 2023ixf
Shara, Michael M.; Pledger, Joanne L.
Stellar evolution theory predicts multiple pathways to the explosive deaths of stars as supernovae. Locating and characterizing the progenitors of well-studied supernovae is important to constrain the theory and to justify and design future surveys to improve on progenitor detections. Here we report the serendipitous preexplosion imaging, by the H…
DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor
García-Bellido, Juan; Bell, Eric F.; Moustakas, J. +45 more
We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger-a galactic immigration event-in exquisite detail. Of the 11,416 sources studied in 3.75 hr of on-sky exposure time, 7438 are M31 sources with well-measured radial velocities. The observations reveal intricate…
Breakdown of the Newton-Einstein Standard Gravity at Low Acceleration in Internal Dynamics of Wide Binary Stars
Chae, Kyu-Hyun
A gravitational anomaly is found at weak gravitational acceleration g N ≲ 10-9 m s-2 from analyses of the dynamics of wide binary stars selected from the Gaia DR3 database that have accurate distances, proper motions, and reliably inferred stellar masses. Implicit high-order multiplicities are required and the mult…
JWST-TST DREAMS: Quartz Clouds in the Atmosphere of WASP-17b
Ranjan, Sukrit; Anderson, Jay; Stevenson, Kevin B. +39 more
Clouds are prevalent in many of the exoplanet atmospheres that have been observed to date. For transiting exoplanets, we know if clouds are present because they mute spectral features and cause wavelength-dependent scattering. While the exact composition of these clouds is largely unknown, this information is vital to understanding the chemistry a…
PHANGS-JWST First Results: A Statistical View on Bubble Evolution in NGC 628
Henshaw, Jonathan D.; Kruijssen, J. M. Diederik; Leroy, Adam K. +50 more
The first JWST observations of nearby galaxies have unveiled a rich population of bubbles that trace the stellar-feedback mechanisms responsible for their creation. Studying these bubbles therefore allows us to chart the interaction between stellar feedback and the interstellar medium, and the larger galactic flows needed to regulate star formatio…
ALMA FIR View of Ultra-high-redshift Galaxy Candidates at z ∼ 11-17: Blue Monsters or Low-z Red Interlopers?
Ouchi, Masami; Papovich, Casey; Finkelstein, Steven L. +50 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 7 observations of a remarkably bright galaxy candidate at ${z}_{\mathrm{phot}}={16.7}_{-0.3}^{+1.9}$ (M UV = -21.6), S5-z17-1, identified in James Webb Space Telescope (JWST) Early Release Observation data of Stephen's Quintet. We do not detect the dust continuum at 866…
A JWST/NIRSpec Exploration of the Connection between Ionization Parameter, Electron Density, and Star-formation-rate Surface Density in z = 2.7-6.3 Galaxies
Shapley, Alice E.; Reddy, Naveen A.; Sanders, Ryan L. +2 more
We examine the factors responsible for the variation in the ionization parameter (U) of high-redshift star-forming galaxies based on medium-resolution JWST/NIRSpec observations obtained by the Cosmic Evolution Early Release Science survey. The sample consists of 48 galaxies with redshifts z spec = 2.7-6.3, which are largely representati…
The SPHINX M-dwarf Spectral Grid. I. Benchmarking New Model Atmospheres to Derive Fundamental M-dwarf Properties
Fortney, Jonathan J.; Muirhead, Philip S.; Line, Michael R. +2 more
About 70%-80% of stars in our solar and Galactic neighborhood are M dwarfs. They span a range of low masses and temperatures relative to solar-type stars, facilitating molecule formation throughout their atmospheres. Standard stellar atmosphere models primarily designed for FGK stars face challenges when characterizing broadband molecular features…