Search Publications
JWST Observations of Starbursts: Polycyclic Aromatic Hydrocarbon Emission at the Base of the M82 Galactic Wind
Boogaard, Leindert A.; Meier, David S.; Böker, Torsten +37 more
We present new observations of the central 1 kpc of the M82 starburst obtained with the James Webb Space Telescope near-infrared camera instrument at a resolution θ ∼ 0.″05–0.″1 (∼1–2 pc). The data comprises images in three mostly continuum filters (F140M, F250M, and F360M), and filters that contain [Fe II] (F164N), H2 v = 1 → 0 (F212N)…
PASSAGES: The Wide-ranging, Extreme Intrinsic Properties of Planck-selected, Lensed Dusty Star-forming Galaxies
Frye, Brenda L.; Yun, Min S.; Wang, Q. Daniel +11 more
The PASSAGES (Planck All-Sky Survey to Analyze Gravitationally-lensed Extreme Starbursts) collaboration has recently defined a sample of 30 gravitationally lensed dusty star-forming galaxies (DSFGs). These rare, submillimeter-selected objects enable high-resolution views of the most extreme sites of star formation in galaxies at cosmic noon. Here,…
A JWST Project on 47 Tucanae. Overview, Photometry, and Early Spectroscopic Results of M Dwarfs and Observations of Brown Dwarfs
Milone, A. P.; Cordoni, G.; Marino, A. F. +14 more
James Webb Space Telescope (JWST) observations have been demonstrated to be efficient in detecting multiple stellar populations in globular clusters (GCs) in the low-mass regime of M dwarfs. We present an overview, and first results, of different projects that can be explored by using the JWST observations gathered under program GO2560 for 47 Tuca…
Many Roads Lead to Lithium: Formation Pathways For Lithium-rich Red Giants
Bedell, Megan; Casey, Andrew R.; Buder, Sven +8 more
Stellar models predict that lithium (Li) inside a star is destroyed during the first dredge-up phase, yet 1.2% of red giant stars are Li-rich. We aim to uncover possible origins of this population, by analyzing 1099 Li-rich giants (A(Li) ≥ 1.5) in GALAH DR3. To expose peculiar traits of Li-rich stars, we construct a reference sample of Li-normal (…
A Parsec-scale Catalog of Molecular Clouds in the Solar Neighborhood Based on 3D Dust Mapping: Implications for the Mass-Size Relation
Alves, João; Zucker, Catherine; Goodman, Alyssa +2 more
We dendrogram the Leike et al. 3D dust map, leveraging its ~1 pc spatial resolution to produce a uniform catalog of molecular clouds in the solar neighborhood. Using accurate distances, we measure the properties of 65 clouds in true 3D space, eliminating much of the uncertainty in mass, size, and density. Clouds in the catalog contain a total of 1…
Early Results from GLASS-JWST. XXIV. The Mass-Metallicity Relation in Lensed Field Galaxies at Cosmic Noon with NIRISS
Santini, Paola; Castellano, Marco; Fontana, Adriano +20 more
We present a measurement of the mass-metallicity relation (MZR) at Cosmic Noon, using the JWST near-infrared wide-field slitless spectroscopy obtained by the GLASS-JWST Early Release Science program. By combining the power of JWST and the lensing magnification by the foreground cluster A2744, we extend the measurements of the MZR to the dwarf mass…
The MUSE Ultra Deep Field (MUDF). V. Characterizing the Mass–Metallicity Relation for Low-mass Galaxies at z ∼ 1–2
Papovich, Casey; Henry, Alaina; Rafelski, Marc +13 more
Using more than 100 galaxies in the MUSE Ultra Deep Field with spectroscopy from the Hubble Space Telescope's (HST) Wide Field Camera 3 and the Very Large Telescope's Multi Unit Spectroscopic Explorer, we extend the gas-phase mass–metallicity relation (MZR) at z ≈ 1–2 down to stellar masses of M ⋆ ≈ 107.5 M ⊙. The …
Discovery of a Metal-poor Red Giant Star with the Highest Ultralithium Enhancement
Beers, Timothy C.; Placco, Vinicius M.; Hansen, Terese T. +10 more
We present the discovery of 2MASS J05241392‑0336543 (hereafter J0524‑0336), a very metal-poor ([Fe/H] = ‑2.43 ± 0.16), highly r-process-enhanced ([Eu/Fe] = +1.34 ± 0.10) Milky Way halo field red giant star, with an ultrahigh Li abundance of A(Li, 3D, NLTE) = 6.15 ± 0.25 and [Li/Fe] = +7.64 ± 0.25, respectively. This makes J0524‑0336 the most lithi…
Circumstellar Interaction in the Ultraviolet Spectra of SN 2023ixf 14–66 Days After Explosion
Filippenko, Alexei V.; Smith, Nathan; Sand, David J. +20 more
SN 2023ixf was discovered in M101 within a day of the explosion and rapidly classified as a Type II supernova with flash features. Here we present ultraviolet (UV) spectra obtained with the Hubble Space Telescope 14, 19, 24, and 66 days after the explosion. Interaction between the supernova ejecta and circumstellar material (CSM) is seen in the UV…
Proposed Resolution to the Solar Open Magnetic Flux Problem
Antiochos, Spiro K.; Wallace, Samantha; Henney, Carl J. +2 more
The solar magnetic fields emerging from the photosphere into the chromosphere and corona are comprised of a combination of closed (field lines with both ends rooted at the Sun) and open (field lines with only one end at the Sun) fields. Since the early 2000s, the magnitude of total unsigned open magnetic flux estimated by coronal models has been i…