Search Publications
Spectrophotometry and radial distribution of multiple stellar populations in globular clusters from Gaia XP spectra
Barbieri, M.; Milone, A. P.; Cordoni, G. +14 more
Understanding the formation of multiple populations in globular clusters (GCs) represents a challenge for stellar population studies. Nevertheless, the outermost cluster regions, likely to hold clues about the initial configuration of GC stars, remain underexplored. We use synthetic spectra reflecting the chemical compositions of first- and second…
Disentangling the Galaxy's Gordian knot: evidence from APOGEE-Gaia for a knotted and slower bar in the Milky Way
Peñarrubia, Jorge; Petersen, Michael S.; Horta Darrington, Danny
The inner
Metallicity of RR Lyrae stars from the Gaia Data Release 3 catalogue computed with Machine Learning algorithms
Garofalo, Alessia; Clementini, Gisella; Muraveva, Tatiana +2 more
We present new
Hawai'i Supernova Flows: a peculiar velocity survey using over a Thousand Supernovae in the near-infrared
Jones, David O.; Scolnic, Dan; Shappee, Benjamin J. +15 more
We introduce the Hawai'i Supernova Flows project and present summary statistics of the first 1217 astronomical transients observed, 668 of which are spectroscopically classified Type Ia Supernovae (SNe Ia). Our project is designed to obtain systematics-limited distances to SNe Ia while consuming minimal dedicated observational resources. To date, …
EMPDF: inferring the Milky Way mass with data-driven distribution function in phase space
Li, Ting S.; Wang, Wenting; Han, Jiaxin +4 more
We introduce the EMPDF (empirical distribution function), a novel dynamical modelling method that infers the gravitational potential from kinematic tracers with optimal statistical efficiency under the minimal assumption of steady state. EMPDF determines the best-fitting potential by maximizing the similarity between instantaneous kinematics and t…
Rapid mid-infrared spectral timing with JWST: GRS 1915+105 during an MIR-bright and X-ray-obscured state
Maccarone, T. J.; Altamirano, D.; Knigge, C. +45 more
We present mid-infrared (MIR) spectral-timing measurements of the prototypical Galactic microquasar GRS 1915+105. The source was observed with the Mid-Infrared Instrument (MIRI) onboard JWST in June 2023 at an MIR luminosity
Internal dynamics of multiple populations in 28 Galactic globular clusters: a wide-field study with Gaia and the Hubble Space Telescope
Milone, A. P.; Cordoni, G.; Marino, A. F. +13 more
We present a detailed analysis of the internal dynamics of multiple stellar populations (MPs) in 28 Galactic globular clusters (GCs) across a wide field of view, extending from the innermost regions to the clusters' outskirts. Using astrophotometric catalogues from ground-based observations, Gaia and the Hubble Space Telescope (HST), we identify f…
Representation learning for time-domain high-energy astrophysics: Discovery of extragalactic fast X-ray transient XRT 200515
Soria, Roberto; Kashyap, Vinay L.; Martínez-Galarza, Juan Rafael +2 more
We present a novel representation learning method for downstream tasks like anomaly detection, unsupervised classification, and similarity searches in high-energy data sets. This enabled the discovery of a new extragalactic fast X-ray transient (FXT) in Chandra archival data, XRT 200515, a needle-in-the-haystack event and the first Chandra FXT of …
The ones that got away: chemical tagging of globular cluster-origin stars with Gaia BP/RP spectra
Belokurov, Vasily; Monty, Stephanie; Ardern-Arentsen, Anke +3 more
Globular clusters (GCs) are sites of extremely efficient star formation, and recent studies suggest they significantly contributed to the early Milky Way's stellar mass build-up. Although their role has since diminished, GCs' impact on the Galaxy's initial evolution can be traced today by identifying their most chemically unique stars - those with…
Measurements of the thermal and ionization state of the intergalactic medium during the cosmic afternoon
Hennawi, Joseph F.; Tripp, Todd M.; Khaire, Vikram +4 more
We perform the first measurement of the thermal and ionization state of the intergalactic medium (IGM) across