Search Publications
PHANGS-JWST First Results: Massive Young Star Clusters and New Insights from JWST Observations of NGC 1365
White, Richard L.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +28 more
A primary new capability of JWST is the ability to penetrate the dust in star-forming galaxies to identify and study the properties of young star clusters that remain embedded in dust and gas. In this Letter we combine new infrared images taken with JWST with our optical Hubble Space Telescope (HST) images of the starbursting barred (Seyfert2) spi…
Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds
Smith, N.; Crowther, P. A.; de Mink, S. E. +6 more
Massive stars (~8-25 M ⊙) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae. We recently presented the discovery of the first set of such stripped stars in a companion paper. Here, we fit the spectra of 10 stars with new atmo…
The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +6 more
We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is already enriched, $12+\mathrm{log}({\rm{O}}/{\rm{H}})={7.90}_{-0.05}^{+0.04}$ . We also find t…
Using [Ne V]/[Ne III] to Understand the Nature of Extreme-ionization Galaxies
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +14 more
Spectroscopic studies of extreme-ionization galaxies (EIGs) are critical to our understanding of exotic systems throughout cosmic time. These EIGs exhibit spectral features requiring >54.42 eV photons: the energy needed to ionize helium into He2+ fully and emit He II recombination lines. Spectroscopic studies of EIGs can probe exotic…
The GLASS-JWST Early Release Science Program. II. Stage I Release of NIRCam Imaging and Catalogs in the Abell 2744 Region
Santini, Paola; Calabrò, Antonello; Castellano, Marco +27 more
We present images and a multiwavelength photometric catalog based on all of the JWST NIRCam observations obtained to date in the region of the Abell 2744 galaxy cluster. These data come from three different programs, namely, the GLASS-JWST Early Release Science Program, UNCOVER, and the Director's Discretionary Time program 2756. The observed area…
The Ages of Galactic Bulge Stars with Realistic Uncertainties
Rich, R. Michael; Johnson, Christian I.; Joyce, Meridith +3 more
Using modern isochrones with customized physics and carefully considered statistical techniques, we recompute the age distribution for a sample of 91 microlensed dwarfs in the Galactic bulge presented by Bensby et al. and do not produce an age distribution consistent with their results. In particular, our analysis finds that only 15 of 91 stars ha…
Potential Atmospheric Compositions of TRAPPIST-1 c Constrained by JWST/MIRI Observations at 15 µm
Kreidberg, Laura; Meadows, Victoria S.; Lincowski, Andrew P. +13 more
The first James Webb Space Telescope observations of TRAPPIST-1 c showed a secondary eclipse depth of 421 ± 94 ppm at 15 µm, which is consistent with a bare rock surface or a thin, O2-dominated, low-CO2 atmosphere. Here we further explore potential atmospheres for TRAPPIST-1 c by comparing the observed secondary eclipse…
PHANGS-JWST First Results: Mapping the 3.3 µm Polycyclic Aromatic Hydrocarbon Vibrational Band in Nearby Galaxies with NIRCam Medium Bands
Sandstrom, Karin M.; Bolatto, Alberto D.; Kruijssen, J. M. Diederik +28 more
We present maps of the 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission feature in NGC 628, NGC 1365, and NGC 7496 as observed with the Near-Infrared Camera imager on JWST from the PHANGS-JWST Cycle 1 Treasury project. We create maps that isolate the 3.3 µm PAH feature in the F335M filter (F335MPAH) using combinations o…
Observable Signature of Merging Stellar-mass Black Holes in Active Galactic Nuclei
Perna, Rosalba; Tagawa, Hiromichi; Kimura, Shigeo S. +2 more
The origin of stellar-mass black hole mergers discovered through gravitational waves is being widely debated. Mergers in the disks of active galactic nuclei (AGNs) represent a promising source of origin, with possible observational clues in the gravitational-wave data. Beyond gravitational waves, a unique signature of AGN-assisted mergers is elect…
First Results from the JWST Early Release Science Program Q3D: The Warm Ionized Gas Outflow in z 1.6 Quasar XID 2028 and Its Impact on the Host Galaxy
Johnson, Sean D.; Lützgendorf, Nora; Maiolino, Roberto +26 more
Quasar feedback may regulate the growth of supermassive black holes, quench coeval star formation, and impact galaxy morphology and the circumgalactic medium. However, direct evidence for quasar feedback in action at the epoch of peak black hole accretion at z ≈ 2 remains elusive. A good case in point is the z = 1.6 quasar WISEA J100211.29+013706.…