Search Publications
Repeating tidal disruptions in GSN 069: Long-term evolution and constraints on quasi-periodic eruptions' models
Read, A. M.; Bianchi, S.; Miniutti, G. +4 more
Context. GSN 069 is the first galactic nucleus where quasi-periodic eruptions (QPEs) have been identified in December 2018. These are high-amplitude, soft X-ray bursts recurring every ∼9 h, lasting ∼1 h, and during which the X-ray count rate increases by up to two orders of magnitude with respect to an otherwise stable quiescent level. The X-ray s…
StarHorse results for spectroscopic surveys and Gaia DR3: Chrono-chemical populations in the solar vicinity, the genuine thick disk, and young alpha-rich stars
Valentini, M.; Anders, F.; Chiappini, C. +16 more
The Gaia mission has provided an invaluable wealth of astrometric data for more than a billion stars in our Galaxy. The synergy between Gaia astrometry, photometry, and spectroscopic surveys gives us comprehensive information about the Milky Way. Using the Bayesian isochrone-fitting code StarHorse, we derive distances and extinctions for more than…
New high-precision strong lensing modeling of Abell 2744. Preparing for JWST observations
Brammer, G.; Grillo, C.; Rosati, P. +8 more
We present a new strong lensing (SL) model of the Hubble Frontier Fields (HFF) galaxy cluster Abell 2744, at z = 0.3072, by exploiting archival Hubble Space Telescope (HST) multiband imaging and Multi Unit Spectroscopic Explorer (MUSE) follow-up spectroscopy. The lens model considers 90 spectroscopically confirmed multiple images (from 30 backgrou…
Gaia Data Release 3. The extragalactic content
Prusti, T.; Mazeh, T.; Zucker, S. +445 more
The Gaia Galactic survey mission is designed and optimized to obtain astrometry, photometry, and spectroscopy of nearly two billion stars in our Galaxy. Yet as an all-sky multi-epoch survey, Gaia also observes several million extragalactic objects down to a magnitude of G ∼ 21 mag. Due to the nature of the Gaia onboard-selection algorithms, these …
Closing in on the sources of cosmic reionization: First results from the GLASS-JWST program
Vulcani, B.; Bradač, M.; Brammer, G. +29 more
The escape fraction of Lyman-continuum (LyC) photons (fesc) is a key parameter for determining the sources of cosmic reionization at z ≥ 6. At these redshifts, owing to the opacity of the intergalactic medium, the LyC emission cannot be measured directly. However, LyC leakers during the epoch of reionization could be identified using in…
Deciphering the extreme X-ray variability of the nuclear transient eRASSt J045650.3−203750. A likely repeating partial tidal disruption event
Gromadzki, M.; Liu, Z.; Buchner, J. +17 more
Context. During its all-sky survey, the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma (SRG) observatory has uncovered a growing number of X-ray transients associated with the nuclei of quiescent galaxies. Benefitting from its large field of view and excellent sensitivity, the eROSITA window…
Gaia DR3 view of dynamical substructure in the stellar halo near the Sun
Ruiz-Lara, Tomás; Helmi, Amina; Matsuno, Tadafumi +4 more
Context. Debris from past merger events is expected and also known, to some extent, to populate the stellar halo near the Sun.
Aims: We aim to identify and characterise such merger debris using Gaia DR3 data supplemented with metallicity and chemical abundance data from LAMOST LRS and APOGEE for halo stars within 2.5 kpc from the Sun.
Me…
An empirical model of the Gaia DR3 selection function
Hogg, David W.; Casey, Andrew R.; Rix, Hans-Walter +12 more
Interpreting and modelling astronomical catalogues requires an understanding of the catalogues' completeness or selection function: what properties determine an object's probability of being including in the catalogue? Here we set out to empirically quantify the completeness of the overall catalogue of Gaia's third data release (DR3). This task is…
Gaia Data Release 3. The first Gaia catalogue of eclipsing-binary candidates
Mazeh, T.; Audard, M.; Rimoldini, L. +11 more
Context. Gaia Data Release 3 (DR3) provides a number of new data products that complement the early DR3 made available two years ago. Among these is the first Gaia catalogue of eclipsing-binary candidates containing 2 184 477 sources with brightnesses from a few magnitudes to 20 mag in the Gaia G-band and covering the full sky.
Aims: We prese…
Gaia Data Release 3. Apsis. III. Non-stellar content and source classification
Hatzidimitriou, D.; Marshall, D. J.; Recio-Blanco, A. +78 more
Context. As part of the third Gaia Data Release, we present the contributions of the non-stellar and classification modules from the eighth coordination unit (CU8) of the Data Processing and Analysis Consortium, which is responsible for the determination of source astrophysical parameters using Gaia data. This is the third in a series of three pap…