Search Publications
Similarities behind the high- and low-α disc: small intrinsic abundance scatter and migrating stars
Ness, Melissa K.; Buck, Tobias; Johnston, Kathryn V. +2 more
The detailed age-chemical abundance relations of stars measure time-dependent chemical evolution. These trends offer strong empirical constraints on nucleosynthetic processes, as well as the homogeneity of star-forming gas. Characterizing chemical abundances of stars across the Milky Way over time has been made possible very recently, thanks to su…
The Gaia-ESO survey: constraining evolutionary models and ages for young low mass stars with measurements of lithium depletion and rotation
Gilmore, G.; Bayo, A.; Randich, S. +13 more
A growing disquiet has emerged in recent years that standard stellar models are at odds with observations of the colour-magnitude diagrams (CMDs) and lithium depletion patterns of pre-main sequence stars in clusters. In this work we select 1246 high probability K/M-type constituent members of five young open clusters (5-125 Myr) in the Gaia-ESO Su…
The velocity structure of the intracluster medium of the Centaurus cluster
Fabian, A. C.; Pinto, C.; Sanders, J. S. +7 more
There are few direct measurements of the intracluster medium (ICM) velocity structure, despite its importance for understanding clusters. We present a detailed analysis of the velocity structure of the Centaurus cluster using XMM-Newton observations. Using a new European Photon Imaging Camera-pn energy scale calibration, which uses the Cu Kα instr…
Age determination of galaxy merger remnant stars using asteroseismology
Davies, Guy R.; Kruijssen, J. M. Diederik; Laporte, Chervin F. P. +12 more
The Milky Way was shaped by the mergers with several galaxies in the past. We search for remnant stars that were born in these foreign galaxies and assess their ages in an effort to put upper limits on the merger times and thereby better understand the evolutionary history of our Galaxy. Using 5D-phase space information from Gaia eDR3, radial velo…
DEVILS: cosmic evolution of SED-derived metallicities and their connection to star formation histories
Holwerda, Benne; Robotham, Aaron S. G.; Phillipps, Steven +6 more
Gas-phase metallicities of galaxies are typically measured through auroral or nebular emission lines, but metallicity also leaves an imprint on the overall spectral energy distribution (SED) of a galaxy and can be estimated through SED fitting. We use the PROSPECT SED fitting code with a flexible parametric star formation history and an evolving m…
High-resolution synthetic UV-submm images for Milky Way-mass simulated galaxies from the ARTEMIS project
Baes, Maarten; Camps, Peter; Kapoor, Anand Utsav +4 more
We present redshift-zero synthetic dust-aware observations for the 45 Milky Way-mass simulated galaxies of the ARTEMIS project, calculated with the SKIRT radiative transfer code. The post-processing procedure includes components for star-forming regions, stellar sources, and diffuse dust. We produce and publicly release realistic high-resolution i…
The cooling of massive white dwarfs from Gaia EDR3
Caiazzo, Ilaria; Heyl, Jeremy; Fleury, Leesa
We determine the distribution of cooling ages of massive Gaia EDR3 white dwarfs identified with over 90 per cent probability within 200 pc and with mass in the range 0.95-1.25 M⊙. Using three sets of publicly available models, we consider sub-samples of these white dwarfs sorted into three equally spaced mass bins. Under the assumption …
Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
Brandt, W. N.; Luo, B.; Garmire, G. P. +8 more
We present deeper Chandra observations for weak-line quasars (WLQs) in a representative sample that previously had limited X-ray constraints, and perform X-ray photometric analyses to reveal the full range of X-ray properties of WLQs. Only 5 of the 32 WLQs included in this representative sample remain X-ray undetected after these observations, and…
Red supergiants in M31: the Humphreys-Davidson limit at high metallicity
Beasor, Emma R.; Davies, Ben; McDonald, Sarah L. E.
The empirical upper limit to red supergiant (RSG) luminosity, known as the Humphreys-Davidson (HD) limit, has been commonly explained as being caused by the stripping of stellar envelopes by metallicity-dependent line-driven winds. As such, the theoretical expectation is that the HD limit should be higher at lower metallicity, where weaker mass-lo…
Ultraluminous high-redshift quasars from SkyMapper - II. New quasars and the bright end of the luminosity function
Fan, Xiaohui; Wolf, Christian; Lai, Samuel +5 more
We search for ultraluminous Quasi-Stellar Objects (QSOs) at high redshift using photometry from the SkyMapper Southern Survey Data Release 3 (DR3), in combination with 2MASS, VHS DR6, VIKING DR5, AllWISE, and CatWISE2020, as well as parallaxes and proper motions from Gaia DR2 and eDR3. We report 142 newly discovered Southern QSOs at 3.8 < z <…