Search Publications
The metal-poor edge of the Milky Way's "thin disc"
Sestito, Federico; Martin, Nicolas; Kordopatis, Georges +9 more
Context. The emergence of the disc in our Galaxy and the relation between thick and thin disc formation and evolution is still a matter of debate. The chemo-dynamical characterization of disc stars is key to resolving this question, particularly at parameter regimes, where both disc components overlap, such as the region around [Fe/H] ∼ −0.7 corre…
CEERS: 7.7 µm PAH Star Formation Rate Calibration with JWST MIRI
Papovich, Casey; Yang, Guang; Finkelstein, Steven L. +33 more
We test the relationship between UV-derived star formation rates (SFRs) and the 7.7 µm polycyclic aromatic hydrocarbon luminosities from the integrated emission of galaxies at z ∼ 0–2. We utilize multiband photometry covering 0.2–160 µm from the Hubble Space Telescope, CFHT, JWST, Spitzer, and Herschel for galaxies in the Cosmic Evolut…
On the Pair-instability Supernova Origin of J1010+2358
Aguado, David S.; Lucchesi, Romain; Amarsi, Anish M. +4 more
The first (Population III) stars formed only out of H and He and were likely more massive than present-day stars. Massive Population III stars in the range 140–260 M ⊙ are predicted to end their lives as pair-instability supernovae (PISNe), enriching the environment with a unique abundance pattern, with high ratios of odd to even elemen…
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)…
ω Centauri: a MUSE discovery of a counter-rotating core
Pechetti, Renuka; Weilbacher, Peter M.; Krajnović, Davor +7 more
ω Centauri is considered the most massive globular cluster of the Milky Way and likely the former nuclear star cluster of a Galaxy accreted by the Milky Way. It is speculated to contain an intermediate-mass black hole (IMBH) from several dynamical models. However, uncertainties regarding the location of the cluster centre or the retention of stell…
Probing the Galactic halo with RR Lyrae stars - V. Chemistry, kinematics, and dynamically tagged groups
Liu, Gaochao; Huang, Yang; Beers, Timothy C. +9 more
We employ a sample of 135 873 RR Lyrae stars (RRLs) with precise photometric-metallicity and distance estimates from the newly calibrated P-ϕ31-R21-[Fe/H] and Gaia G band P-R21-[Fe/H] absolute magnitude-metallicity relations of Li et al., combined with available proper motions from Gaia EDR3, and 6955 systemic radi…
Searching for Giant Exoplanets around M-dwarf Stars (GEMS) I: Survey Motivation
Cochran, William D.; Mahadevan, Suvrath; Teske, Johanna +13 more
Recent discoveries of transiting giant exoplanets around M-dwarf stars (GEMS), aided by the all-sky coverage of TESS, are starting to stretch theories of planet formation through the core-accretion scenario. Recent upper limits on their occurrence suggest that they decrease with lower stellar masses, with fewer GEMS around lower-mass stars compare…
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,…
JOYS: MIRI/MRS spectroscopy of gas-phase molecules from the high-mass star-forming region IRAS 23385+6053
Henning, T.; Östlin, G.; Güdel, M. +16 more
Context. Space-based mid-infrared (IR) spectroscopy is a powerful tool for the characterization of important star formation tracers of warm gas which are unobservable from the ground. The previous mid-IR spectra of bright high-mass protostars with the Infrared Space Observatory (ISO) in the hot-core phase typically show strong absorption features …
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…