Search Publications
AIMS - a new tool for stellar parameter determinations using asteroseismic constraints
Chaplin, William J.; Davies, Guy R.; Campante, Tiago L. +12 more
A key aspect in the determination of stellar properties is the comparison of observational constraints with predictions from stellar models. Asteroseismic Inference on a Massive Scale (AIMS) is an open source code that uses Bayesian statistics and a Markov Chain Monte Carlo approach to find a representative set of models that reproduce a given set…
The effect of stellar-mass black holes on the central kinematics of ω Cen: a cautionary tale for IMBH interpretations
Hénault-Brunet, Vincent; Gieles, Mark; Zocchi, Alice
The search for intermediate-mass black holes (IMBHs) in the centre of globular clusters is often based on the observation of a central cusp in the surface brightness profile and a rise towards the centre in the velocity dispersion profiles. Similar signatures, however, could result from other effects, that need to be taken into account in order to…
The ALMA Fornax Cluster Survey I: stirring and stripping of the molecular gas in cluster galaxies
de Looze, Ilse; Baes, Maarten; Bendo, George J. +15 more
We present the first results of the ALMA Fornax Cluster Survey: a complete ALMA survey of all members of the Fornax galaxy cluster that were detected in H I or in the far-infrared with Herschel. The sample consists of a wide variety of galaxy types, ranging from giant ellipticals to spiral galaxies and dwarfs, located in all (projected) areas of t…
The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728
Lutz, D.; Genzel, R.; Sturm, E. +22 more
We report on our combined analysis of HST, VLT/MUSE, VLT/SINFONI, and ALMA observations of the local Seyfert 2 galaxy, NGC 5728 to investigate in detail the feeding and feedback of the active galactic nucleus (AGN). The data sets simultaneously probe the morphology, excitation, and kinematics of the stars, ionized gas, and molecular gas over a lar…
Extremely metal-poor galaxies with HST/COS: laboratories for models of low-metallicity massive stars and high-redshift galaxies
Charlot, Stéphane; Chevallard, Jacopo; Stark, Daniel P. +3 more
Ultraviolet (UV) observations of local star-forming galaxies have begun to establish an empirical baseline for interpreting the rest-UV spectra of reionization-era galaxies. However, existing high-ionization emission line measurements at z > 6 (W_{C riptscIV,0}{} ≳ 20 Å) are uniformly stronger than observed locally (W_{C riptscIV,0}{} ≲ 2 Å), l…
Signatures of resonance and phase mixing in the Galactic disc
Bovy, Jo; Kawata, Daisuke; Mackereth, J. Ted +3 more
Gaia DR2 has provided an unprecedented wealth of information about the kinematics of stars in the Solar neighbourhood, and has highlighted the degree of features in the Galactic disc. We confront the data with a range of bar and spiral models in both action-angle space, and the RG-vϕ plane. We find that the phase mixing induc…
GRRMHD simulations of tidal disruption event accretion discs around supermassive black holes: jet formation, spectra, and detectability
Narayan, Ramesh; Curd, Brandon
We report results from general relativistic radiation magnetohydrodynamics (GRRMHD) simulations of a super-Eddington black hole (BH) accretion disc formed as a result of a tidal disruption event (TDE). We consider the fiducial case of a solar mass star on a mildly penetrating orbit disrupted by a supermassive BH of mass 10^6 M_⊙, and consider the …
Effects of anisotropic stress in interacting dark matter - dark energy scenarios
Yang, Weiqiang; Xu, Lixin; Pan, Supriya +1 more
We study a novel interacting dark energy - dark matter scenario where the anisotropic stress of the large-scale inhomogeneities is considered. The dark energy has a constant equation of state and the interaction model produces stable perturbations. The resulting picture is constrained using different astronomical data aiming to measure the impact …
Identification of Young Stellar Object candidates in the Gaia DR2 x AllWISE catalogue with machine learning methods
Szabados, L.; Beck, R.; Ábrahám, P. +8 more
The second Gaia Data Release (DR2) contains astrometric and photometric data for more than 1.6 billion objects with mean Gaia G magnitude <20.7, including many Young Stellar Objects (YSOs) in different evolutionary stages. In order to explore the YSO population of the Milky Way, we combined the Gaia DR2 data base with Wide-field Infrared Survey…
A multimessenger study of the Milky Way's stellar disc and bulge with LISA, Gaia, and LSST
Korol, Valeriya; Rossi, Elena M.; Barausse, Enrico
The upcoming Laser Interferometer Space Antenna (LISA) mission offers the unique opportunity to study the Milky Way through gravitational wave (GW) radiation from a large population of Galactic binaries. Among the variety of Galactic GW sources, LISA is expected to individually resolve signals from ∼105 ultra-compact double white dwarf …