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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 …
The Pristine survey - VI. The first three years of medium-resolution follow-up spectroscopy of Pristine EMP star candidates
Sestito, Federico; Navarro, Julio F.; Martin, Nicolas +27 more
We present the results of a 3-yr long, medium-resolution spectroscopic campaign aimed at identifying very metal-poor stars from candidates selected with the CaHK, metallicity-sensitive Pristine survey. The catalogue consists of a total of 1007 stars, and includes 146 rediscoveries of metal-poor stars already presented in previous surveys, 707 new …
Dark Energy Surveyed Year 1 results: calibration of cluster mis-centring in the redMaPPer catalogues
Bechtol, K.; Smith, M.; Allam, S. +84 more
The centre determination of a galaxy cluster from an optical cluster finding algorithm can be offset from theoretical prescriptions or N-body definitions of its host halo centre. These offsets impact the recovered cluster statistics, affecting both richness measurements and the weak lensing shear profile around the clusters. This paper models the …
HELP: a catalogue of 170 million objects, selected at 0.36-4.5 µm, from 1270 deg2 of prime extragalactic fields
Oliver, Seb; Vaccari, Mattia; Farrah, Duncan +15 more
We present an optical to near-infrared (NIR) selected astronomical catalogue covering 1270 deg2. This is the first attempt to systematically combine data from 23 of the premier extragalactic survey fields - the product of a vast investment of telescope time. The fields are those imaged by the Herschel Space Observatory that form the Her…