Search Publications
GA-NIFS: the interplay between merger, star formation, and chemical enrichment in MACS1149-JD1 at z = 9.11 with JWST/NIRSpec
Maiolino, R.; Perna, M.; Cresci, G. +15 more
We present JWST/NIRSpec integral-field spectroscopy observations of the z $\sim$ 9.11 lensed galaxy MACS1149-JD1, as part of the GA-NIFS programme. The data were obtained with both the G395H grating (R $\sim$ 2700) and the prism (R $\sim$ 100). This target shows a main elongated UV-bright clump and a secondary component detected in continuum emiss…
TRINITY IV: predictions for supermassive black holes at z ≳ 6
Fan, Xiaohui; Aird, James; Yang, Jinyi +7 more
We present predictions for the high-redshift halo-galaxy-supermassive black hole (SMBH) connection from the TRINITY model. Matching a comprehensive compilation of galaxy (0 ≤ z ≤ 13) and SMBH data sets (0 ≤ z ≤ 6.5), TRINITY finds: (1) The number of SMBHs with M• > 109 M⊙ in the observable Universe increases by …
TOI-544 b: a potential water-world inside the radius valley in a two-planet system
Fridlund, M.; Pallé, E.; Barragán, O. +32 more
We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet Survey Satellite (TESS). We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N spectra to spectroscopically confirm…
Spectroscopic identification of rapidly rotating red giant stars in APOKASC-3 and APOGEE DR16
García, Rafael A.; Mathur, Savita; Pinsonneault, Marc H. +6 more
Rotationally enhanced red giant stars are astrophysically interesting but rare. In this paper, we present a catalogue of 3217 active red giant candidates in the APOGEE DR16 (Apache Point Observatory Galactic Evolution Experiment - Data Release 16) survey. We use a control sample in the well-studied Kepler fields to demonstrate a strong relationshi…
VIA MACHINAE 2.0: Full-sky, model-agnostic search for stellar streams in Gaia DR2
Buckley, Matthew R.; Shih, David; Necib, Lina
We present an update to VIA MACHINAE, an automated stellar stream-finding algorithm based on the deep learning anomaly detector ANODE. VIA MACHINAE identifies stellar streams within Gaia, using only angular positions, proper motions, and photometry, without reference to a model of the Milky Way potential for orbit integration or stellar distances.…
The morphological mix of dwarf galaxies in the nearby Universe
Kaviraj, S.; Watkins, A. E.; Lazar, I. +3 more
We use a complete, unbiased sample of 257 dwarf (10$^{8}\, {\rm M}_{\odot } \lt M_{\rm {\star }} \lt 10^{9.5}\, {\rm M}_{\odot }$) galaxies at z < 0.08, in the COSMOS field, to study the morphological mix of the dwarf population in low-density environments. Visual inspection of extremely deep optical images and their unsharp-masked counterparts…
Multimass modelling of milky way globular clusters - II. Present-day black hole populations
Hénault-Brunet, V.; Gieles, M.; Baumgardt, H. +2 more
Populations of stellar-mass black holes (BHs) in globular clusters (GCs) influence their dynamical evolution and have important implications on one of the main formation channels for gravitational wave sources. Inferring the size of these populations remains difficult, however. In this work, multimass models of 34 Milky Way GCs, first presented in…
Structure, kinematics, and time evolution of the Galactic warp from Classical Cepheids
Antoja, Teresa; Aguilar, Luis; Ramos, Pau +3 more
The warp is a well-known undulation of the Milky Way disc. Its structure has been widely studied, but only since Gaia DR2 has it been possible to reveal its kinematic signature beyond the solar neighbourhood. In this work, we present an analysis of the warp traced by Classical Cepheids by means of a Fourier decomposition of their height (Z) and, f…
Measuring the initial-final mass relation using wide double white dwarf binaries from Gaia DR3
Littlefair, S. P.; Hollands, M. A.; Parsons, S. G.
The initial-final mass relation (IFMR) maps the masses of main-sequence stars to their white dwarf descendants. The most common approach to measure the IFMR has been to use white dwarfs in clusters. However, it has been shown that wide double white dwarfs can also be used to measure the IFMR using a Bayesian approach. We have observed a large samp…
What if GW190425 did not produce a black hole promptly?
Murase, Kohta; Radice, David; Ricigliano, Giacomo +3 more
It is widely believed that the binary neutron star merger GW190425 produced a black hole promptly upon merger. Motivated by the potential association with the fast radio burst FRB 20190425A, which took place 2.5 h after the merger, we revisit the question of the outcome of GW190425 by means of numerical relativity simulations. We show that current…