Search Publications
Self-consistent models of our Galaxy
Vasiliev, Eugene; Binney, James
A new class of models of stellar discs is introduced and used to build a self-consistent model of our Galaxy. The model is defined by the parameters that specify the action-based distribution functions (DFs) f(J) of four stellar discs (three thin-disc age cohorts and a thick disc), spheroidal bulge and spheroidal stellar and dark haloes. From thes…
The first large catalogue of spectroscopic redshifts in Webb's first deep field, SMACS J0723.3-7327
Ravindranath, Swara; Willott, Chris J.; Bradač, Maruša +20 more
We present a spectroscopic redshift catalogue of the SMACS J0723.3-7327 field ('Webb's First Deep Field') obtained from JWST/NIRISS grism spectroscopy and supplemented with JWST/NIRSpec and VLT/MUSE redshifts. The catalogue contains a total of 190 sources with secure spectroscopic redshifts, including 156 NIRISS grism redshifts, 123 of which are f…
The MSPSRπ catalogue: VLBA astrometry of 18 millisecond pulsars
Lazio, T. J. W.; Guillemot, L.; Chatterjee, S. +13 more
With unparalleled rotational stability, millisecond pulsars (MSPs) serve as ideal laboratories for numerous astrophysical studies, many of which require precise knowledge of the distance and/or velocity of the MSP. Here, we present the astrometric results for 18 MSPs of the 'MSPSR$\pi$' project focusing exclusively on astrometry of MSPs, which inc…
Constraints on light decaying dark matter candidates from 16 yr of INTEGRAL/SPI observations
Calore, F.; Dekker, A.; Serpico, P. D. +1 more
We apply the recently developed analysis of 16 yr of INTEGRAL/SPI data including a dark matter spatial template to derive bounds on dark matter candidates lighter than weakly interacting massive particles (like sterile neutrinos or axion-like particles) decaying into line or continuum electromagnetic final state channels. The bounds obtained are t…
The geometry of the hot corona in MCG-05-23-16 constrained by X-ray polarimetry
Antonelli, L. A.; Costa, E.; Bianchi, S. +105 more
We report on the second observation of the radio-quiet active galactic nucleus MCG-05-23-16 performed with the Imaging X-ray Polarimetry Explorer (IXPE). The observation started on 2022 November 6 for a net observing time of 640 ks, and was partly simultaneous with NuSTAR (86 ks). After combining these data with those obtained in the first IXPE po…
Chemical cartography with LAMOST and Gaia reveal azimuthal and spiral structure in the Galactic disc
Hawkins, Keith
Chemical Cartography, or mapping, of our Galaxy has the potential to fully transform our view of its structure and formation. In this work, we use chemical cartography to explore the metallicity distribution of OBAF-type disc stars from the LAMOST survey and a complementary sample of disc giant stars from Gaia DR3. We use these samples to constrai…
A needle in a haystack? Catching Population III stars in the epoch of reionization: I. Population III star-forming environments
Pentericci, Laura; Graziani, Luca; Schneider, Raffaella +4 more
Despite extensive search efforts, direct observations of the first [Population III (Pop III)] stars have not yet succeeded. Theoretical studies have suggested that late Pop III star formation is still possible in pristine clouds of high-mass galaxies, co-existing with Pop II stars, down to the epoch of reionization. Here, we re-assess this finding…
A catalogue of cataclysmic variables from 20 yr of the Sloan Digital Sky Survey with new classifications, periods, trends, and oddities
Thorstensen, John R.; Breedt, Elmé; Gänsicke, Boris T. +7 more
We present a catalogue of 507 cataclysmic variables (CVs) observed in SDSS I to IV including 70 new classifications collated from multiple archival data sets. This represents the largest sample of CVs with high-quality and homogeneous optical spectroscopy. We have used this sample to derive unbiased space densities and period distributions for the…
Spectrophotometric analysis of magnetic white dwarf - I. Hydrogen-rich compositions
Dufour, Patrick; Jordan, Stefan; Hardy, François
We present a homogeneous analysis of all DA stars labelled as magnetic in the Montreal White Dwarf Database. Our sample is restricted to almost all known magnetic white dwarf showing clear sign of splitting (B ≳ 1-2 MG) that have parallax measurements from the second Gaia data release, photometric data from diverse surveys and spectroscopic data f…
An empirical study of dust properties at the earliest epochs
Maiolino, Roberto; Jones, Gareth C.; Smit, Renske +2 more
We present an empirical analysis of the properties of dust-continuum emission in a sample of 17 galaxies in the early Universe (4 < z < 8) with well-sampled far-infrared spectral energy distributions (SEDs) compiled from the literature. We place our results into context by self-consistently comparing to samples of nearby star-forming galaxie…