Search Publications
[Ne v] emission from a faint epoch of reionization-era galaxy: evidence for a narrow-line intermediate-mass black hole
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +16 more
Here, we present high spectral resolution
JWST FRESCO: a comprehensive census of H β + [O III] emitters at 6.8 < z < 9.0 in the GOODS fields
Chisholm, J.; Wuyts, S.; Schaerer, D. +27 more
We present the census of H
An empirical reionization history model inferred from the low-redshift Lyman continuum survey and the star-forming galaxies at z > 8
Koekemoer, Anton M.; Scarlata, Claudia; Langeroodi, Danial +8 more
We present a new analysis of the rest-frame ultraviolet (UV) and optical spectra of a sample of three z > 8 galaxies discovered behind the gravitational lensing cluster RX J2129.4+0009. We combine these observations with z > 7.5 galaxies from the literature, for which similar measurements are available. As already pointed out in other studie…
Triage of the Gaia DR3 astrometric orbits. II. A census of white dwarfs
Mazeh, T.; Shahaf, S.; Toonen, S. +4 more
The third data release of Gaia was the first to include orbital solutions assuming non-single stars. Here, we apply the astrometric triage technique of Shahaf et al. to identify binary star systems with companions that are not single main-sequence stars. Gaia's synthetic photometry of these binaries is used to distinguish between systems likely to…
Unveiling the hidden Universe with JWST: the contribution of dust-obscured galaxies to the stellar mass function at z 3 - 8
Xiao, M.; Brammer, G.; Toft, S. +17 more
With the advent of JWST, we can probe the rest-frame optical emission of galaxies at $z\gt 3$ with high sensitivity and spatial resolution, making it possible to accurately characterize red, optically faint galaxies and thus move towards a more complete census of the galaxy population at high redshifts. To this end, we present a sample of 148 mass…
Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses
Massey, Richard; Robertson, Andrew; Cole, Shaun +9 more
The cold dark matter (DM) model predicts that every galaxy contains thousands of DM subhaloes; almost all other DM models include a physical process that smooths away the subhaloes. The subhaloes are invisible, but could be detected via strong gravitational lensing, if they lie on the line of sight to a multiply imaged background source, and pertu…
The Pristine Inner Galaxy Survey - VIII. Characterizing the orbital properties of the ancient, very metal-poor inner Milky Way
Lewis, Geraint F.; Belokurov, Vasily; Buder, Sven +19 more
The oldest stars in the Milky Way (born in the first few billion years) are expected to have a high density in the inner few kpc, spatially overlapping with the Galactic bulge. We use spectroscopic data from the Pristine Inner Galaxy Survey (PIGS) to study the dynamical properties of ancient, metal-poor inner Galaxy stars. We compute distances usi…
On the existence of a very metal-poor disc in the Milky Way
Belokurov, Vasily; Ardern-Arentsen, Anke; Zhang, Hanyuan
The question of whether the Milky Way's disc extends to low metallicity has been the subject of debate for many years. We aim to address the question by employing a large sample of giant stars with radial velocities and homogeneous metallicities based on the Gaia Data Release 3 BP/RP(XP) spectra. We study the 3D velocity distribution of stars in v…
Lyα emission in galaxies at z ≃ 5-6: new insight from JWST into the statistical distributions of Lyα properties at the end of reionization
Charlot, Stéphane; Chevallard, Jacopo; Maseda, Michael V. +22 more
JWST has recently sparked a new era of Lyα spectroscopy, delivering the first measurements of the Lyα escape fraction and velocity profile in typical galaxies at z ≃ 6-10. These observations offer new prospects for insight into the earliest stages of reionization. But to realize this potential, we need robust models of Lyα properties in galaxies a…
Near-infrared transmission spectroscopy of HAT-P-18 b with NIRISS: Disentangling planetary and stellar features in the era of JWST
MacDonald, Ryan J.; Johnstone, Doug; Dang, Lisa +24 more
The JWST Early Release Observations (ERO) included a NIRISS/SOSS (0.6-2.8 µm) transit of the ~ 850 K Saturn-mass exoplanet HAT-P-18 b. Initial analysis of these data reported detections of water, escaping helium and haze. However, active K dwarfs like HAT-P-18 possess surface heterogeneities - star-spots and faculae - that can complicate the…