Search Publications
Identifying LISA verification binaries among the Galactic population of double white dwarfs
Korol, Valeriya; Moore, Christopher J.; Vecchio, Alberto +7 more
Double white dwarfs (DWDs) will be the most numerous gravitational-wave (GW) sources for the Laser Interferometer Space Antenna (LISA). Most of the Galactic DWDs will be unresolved and will superpose to form a confusion noise foreground, the dominant LISA noise source around ${\sim} 0.5\!-\!3\, \mathrm{mHz}$ . A small fraction of these sources wil…
What if young z > 9 JWST galaxies hosted massive black holes?
Volonteri, Marta; Habouzit, Mélanie; Colpi, Monica
JWST is discovering star-forming 'candidate' galaxies with photometric redshifts z > 9 and little attenuation. We model presumptive massive black holes (MBHs) in such galaxies and find that their unobscured emission is fainter than the galaxy starlight in JWST filters, and difficult to be detected via colour-colour selection, and X-ray and radi…
Evidence for a bottom-light initial mass function in massive star clusters
Hénault-Brunet, V.; Baumgardt, H.; Sollima, A. +1 more
We have determined stellar mass functions of 120 Milky Way globular clusters and massive Large Magellanic Cloud/Small Magellanic Cloud star clusters based on a comparison of archival Hubble Space Telescope photometry with a large grid of direct N-body simulations. We find a strong correlation of the global mass function slopes of star clusters wit…
Confirmation and Keplerian motion of the gap-carving protoplanet HD 169142 b
Pinte, Christophe; Christiaens, Valentin; Price, Daniel J. +4 more
We present the re-detection of a compact source in the face-on protoplanetary disc surrounding HD 169142, using VLT/SPHERE data in YJH bands. The source is found at a separation of 0${_{.}^{\prime\prime}}$319 (~37 au) from the star. Three lines of evidence argue in favour of the signal tracing a protoplanet: (i) it is found in the annular gap sepa…
Probing sub-galactic mass structure with the power spectrum of surface-brightness anomalies in high-resolution observations of galaxy-galaxy strong gravitational lenses. II. Observational constraints on the subgalactic matter power spectrum
Vegetti, S.; McKean, J. P.; Treu, T. +5 more
Stringent observational constraints on the subgalactic matter power spectrum would allow one to distinguish between the concordance ΛCDM and the various alternative dark-matter models that predict significantly different properties of mass structure in galactic haloes. Galaxy-galaxy strong gravitational lensing provides a unique opportunity to pro…
Energy wrinkles and phase-space folds of the last major merger
Grand, Robert J. J.; Fattahi, Azadeh; Vasiliev, Eugene +5 more
Relying on the dramatic increase in the number of stars with full 6D phase-space information provided by the Gaia Data Release 3, we resolve the distribution of the stellar halo around the Sun to uncover signatures of incomplete phase-mixing. We show that, for the stars likely belonging to the last massive merger, the (vr, r) distributi…
The rebrightening of a ROSAT-selected tidal disruption event: repeated weak partial disruption flares from a quiescent galaxy?
Liu, Z.; Buchner, J.; Nandra, K. +11 more
The ROSAT-selected tidal disruption event (TDE) candidate RX J133157.6-324319.7 (J1331) was detected in 1993 as a bright [0.2-2 keV flux of (1.0 ± 0.1) × 10-12 erg s-1 cm-2], ultra-soft (kT = 0.11 ± 0.03 keV) X-ray flare from a quiescent galaxy (z = 0.051 89). During its fifth all-sky survey (eRASS5) in 2022, Spect…
On the impact of f(Q) gravity on the large scale structure
Sokoliuk, Oleksii; Arora, Simran; Praharaj, Subhrat +2 more
We investigate the exponential f(Q) symmetric teleparallel gravitation, namely $f(Q)=Q+\alpha Q_0(1-e^{-\beta \sqrt{Q/Q_0}})$ using ME-GADGET code to probe the structure formation with box sizes LBox = 10/100 Mpc h-1 and middle resolution $N_p^{1/3}=512$. To reproduce viable cosmology within the aforementioned modified gravit…
The VANDELS survey: the ionizing properties of star-forming galaxies at 3 ≤ z ≤ 5 using deep rest-frame ultraviolet spectroscopy
Chisholm, J.; Schaerer, D.; Cullen, F. +15 more
The physical properties of Epoch of Reionization (EoR) galaxies are still poorly constrained by observations. To better understand the ionizing properties of galaxies in the EoR, we investigate deep, rest-frame ultraviolet (UV) spectra of ≃500 star-forming galaxies at 3 ≤ z ≤ 5 selected from the public ESO-VANDELS spectroscopic survey. The absolut…
A spectrophotometric analysis of cool white dwarfs in the Gaia and pan-STARRS footprint
Bergeron, P.; Blouin, Simon; Leggett, S. K. +1 more
We present a spectrophotometric analysis of 2880 cool white dwarfs within 100 pc of the Sun and cooler than Teff ~ 10 000 K, with grizy Pan-STARRS photometry and Gaia trigonometric parallaxes available. We also supplement our data sets with near-infrared JHK photometry, when available, which is shown to be essential for interpreting the…