Search Publications
Metal-poor stars observed with the Magellan Telescope - IV. Neutron-capture element signatures in 27 main-sequence stars
Frebel, Anna; Mardini, Mohammad K.; Christlieb, Norbert +3 more
We present a chemo-dynamical analysis for 27 near main-sequence turnoff metal-poor stars, including 20 stars analysed for the first time. The sample spans a range in [Fe/H] from -2.5 to -3.6, with 44 per cent having [Fe/H]<-2.9. We derived chemical abundances for 17 elements, including strontium and barium. We derive Li abundances for the sampl…
GOALS-JWST: Mid-infrared Molecular Gas Excitation Probes the Local Conditions of Nuclear Star Clusters and the Active Galactic Nucleus in the LIRG VV 114
Inami, Hanae; Böker, Torsten; Viti, Serena +19 more
The enormous increase in mid-IR sensitivity and spatial and spectral resolution provided by the JWST spectrographs enables, for the first time, detailed extragalactic studies of molecular vibrational bands. This opens an entirely new window for the study of the molecular interstellar medium in luminous infrared galaxies (LIRGs). We present a detai…
JWST reveals star formation across a spiral arm in M33
Williams, Benjamin F.; Sandstrom, Karin M.; Johnson, L. Clifton +13 more
Young stellar objects (YSOs) are the gold standard for tracing star formation in galaxies but have been unobservable beyond the Milky Way and Magellanic Clouds. But that all changed when the JWST was launched, which we use to identify YSOs in the Local Group galaxy M33, marking the first time that individual YSOs have been identified at these larg…
The first white dwarf debris disc observed by JWST
Desch, Steven J.; Su, Kate Y. L.; Farihi, Jay +1 more
This letter reports the first JWST spectroscopy of a white dwarf debris disc, giving a preliminary assessment of the salient features, and recommendations for future observations. The polluted and dusty star WD 0145+234 experienced a major collisional event in its circumstellar disc in 2018, accompanied by an infrared outburst, and subsequently a …
An IXPE-led X-Ray Spectropolarimetric Campaign on the Soft State of Cygnus X-1: X-Ray Polarimetric Evidence for Strong Gravitational Lensing
Ingram, Adam; Kaaret, Philip; Wu, Kinwah +134 more
We present the first X-ray spectropolarimetric results for Cygnus X-1 in its soft state from a campaign of five IXPE observations conducted during 2023 May–June. Companion multiwavelength data during the campaign are likewise shown. The 2–8 keV X-rays exhibit a net polarization degree PD = 1.99% ± 0.13% (68% confidence). The polarization signal is…
The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS
Barro, Guillermo; Dickinson, Mark; Giavalisco, Mauro +75 more
UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields—GOODS-N, GOODS-S, EGS, and COSMOS—covering a total area of ∼426 arcmin2. This is ∼2.7 times larger than the area covered by previous deep-field…
GA-NIFS: JWST/NIRSpec IFS view of the z ∼ 3.5 galaxy GS5001 and its close environment at the core of a large-scale overdensity
Pérez-González, Pablo G.; Charlot, Stéphane; Parlanti, Eleonora +19 more
We present JWST Near-Infrared Spectrograph (NIRSpec) observations in integral field spectroscopic (IFS) mode of the galaxy GS5001 at redshift z = 3.47, the central member of a candidate protocluster in the GOODS-S field. The data cover a field of view (FoV) of 4″ × 4″ (∼30 × 30 kpc2) and were obtained as part of the Galaxy Assembly with…
Gravitational Wave Search through Electromagnetic Telescopes
Kohri, Kazunori; Ito, Asuka; Nakayama, Kazunori
We study the graviton-photon conversion in the magnetic fields of the Earth, the Milky Way, and intergalactic regions. Requiring that the photon flux converted from gravitons does not exceed the observed photon flux with telescopes, we derive upper limits on the stochastic gravitational waves in frequency ranges from 107-1035…
Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud
Zapartas, E.; Munoz-Sanchez, G.; de Wit, S. +3 more
Context. The high mass-loss rates of red supergiants (RSGs) drastically affect their evolution and final fate, but their mass-loss mechanism remains poorly understood. Various empirical prescriptions scaled with luminosity have been derived in the literature, yielding results with a dispersion of two to three orders of magnitude.
Aims: We det…
Young, wild, and free: The early expansion of star clusters
Dalessandro, E.; Vesperini, E.; Livernois, A. +1 more
Early expansion plays a fundamental role in the dynamical evolution of young star clusters. However, until very recently most of our understanding of cluster expansion was based only on indirect evidence or on statistically limited samples of clusters. Here we present a comprehensive kinematic analysis of virtually all known young Galactic cluster…