Search Publications
The Gaia-ESO Survey: empirical estimates of stellar ages from lithium equivalent widths (EAGLES)
Gilmore, G.; Guiglion, G.; Randich, S. +17 more
We present an empirical model of age-dependent photospheric lithium depletion, calibrated using a large homogeneously analysed sample of 6200 stars in 52 open clusters, with ages from 2 to 6000 Myr and -0.3 < [Fe/H] < 0.2, observed in the Gaia-ESO spectroscopic survey. The model is used to obtain age estimates and posterior age probability d…
Evidence of high-mass star formation through multiscale mass accretion in hub-filament-system clouds
Zhang, Yong; Sanhueza, Patricio; Tej, Anandmayee +30 more
We present a statistical study of a sample of 17 hub-filament-system (HFS) clouds of high-mass star formation using high-angular resolution (~1-2 arcsec) ALMA 1.3 and 3 mm continuum data. The sample includes eight infrared (IR)-dark and nine IR-bright types, which correspond to an evolutionary sequence from the IR-dark to IR-bright stage. The cent…
Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the virtual observatory
Solano, E.; Rebassa-Mansergas, A.; Torres, S. +5 more
The third data release of Gaia has provided low-resolution spectra for ~100 000 white dwarfs (WDs) that, together with the excellent photometry and astrometry, represent an unrivalled benchmark for the study of this population. In this work, we first built a highly complete volume-limited sample consisting in 12 718 WDs within 100 pc from the Sun.…
EPOCHS VII: discovery of high-redshift (6.5 < z < 12) AGN candidates in JWST ERO and PEARLS data
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +24 more
We present an analysis of a sample of robust high-redshift galaxies selected from the 'blank' fields of the Prime Extragalactic Areas for Reionization Science (PEARLS) survey and Early Release Observations (ERO) data from JWST with the aim of selecting candidate high-redshift active galactic nuclei (AGN). Sources were identified from this parent s…
The Cosmic Hunt for members in the outskirts of ultra-faint dwarf galaxies: Ursa Major I, Coma Berenices, and Boötes I
Sestito, Federico; Jensen, Jaclyn; McConnachie, Alan W. +6 more
Gaia EDR3 data were used to identify potential members in the outskirts of three ultra-faint dwarf (UFD) galaxies: Coma Berenices (>2Rh), Ursa Major I (~4Rh), and Boötes I (~4Rh), as well as a new member in the central region of Ursa Major I. These targets were observed with the Gemini GRACES spectrograph, which…
Stellar halo substructure generated by bar resonances
Belokurov, Vasily; Evans, N. Wyn; Davies, Elliot Y. +1 more
Using data from the Gaia satellite's Radial Velocity Spectrometer Data Release 3 (RVS, DR3), we find a new and robust feature in the phase-space distribution of halo stars. It is a prominent ridge at constant energy and with angular momentum Lz > 0. We run test particle simulations of a stellar halo-like distribution of particles in …
Gaia white dwarfs within 40 pc - III. Spectroscopic observations of new candidates in the Southern hemisphere
Hermes, J. J.; Gänsicke, B. T.; Jordan, S. +31 more
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the Southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Telescope. Almost all candidates were selected from Gaia Data Release 3 (DR3). We find a total of 246 …
Internal kinematics of Gaia DR3 wide binaries: anomalous behaviour in the low acceleration regime
Hernandez, X.
The Gaia eDR3 catalogue has recently been used to study statistically the internal kinematics of wide binary populations using relative velocities of the two component stars, ΔV, total binary masses, mB, and separations, s. For s ≳ 0.01 pc, these binaries probe the low-acceleration a ≲ 2a0 regime where gravitational anomalies…
Metal line emission from galaxy haloes at z ≈ 1
Prochaska, J. Xavier; Rafelski, Marc; Nelson, Dylan +12 more
We present a study of the metal-enriched halo gas, traced using Mg II and [O II] emission lines, in two large, blind galaxy surveys - the MUSE (Multi Unit Spectroscopic Explorer) Analysis of Gas around Galaxies (MAGG) and the MUSE Ultra Deep Field (MUDF). By stacking a sample of ≈600 galaxies (stellar masses $M_*$ ≈ 106-12 $\rm M_\odot$…
A real-time transient detector and the living Swift-XRT point source catalogue
Cenko, S. B.; Campana, S.; Kennea, J. A. +5 more
We present the Living Swift-XRT Point Source (LSXPS) catalogue and real-time transient detector. This system allows us for the first time to carry out low-latency searches for new transient X-ray events fainter than those available to the current generation of wide-field imagers, and report their detection in near real time. Previously, such event…