Search Publications
A solution to the proplyd lifetime problem
Hacar, Alvaro; Rosotti, Giovanni P.; Clarke, Cathie J. +2 more
Protoplanetary discs (PPDs) in the Orion Nebula Cluster (ONC) are irradiated by UV fields from the massive star θ1C. This drives thermal winds, inducing mass-loss rates of up to \dot{M}_wind∼ 10^{-7} M_⊙ yr-1 in the `proplyds' (ionized PPDs) close to the centre. For the mean age of the ONC and reasonable initial PPD masses, s…
Chronostar: a novel Bayesian method for kinematic age determination - I. Derivation and application to the β Pictoris moving group
Federrath, Christoph; Žerjal, Maruša; Ireland, Michael J. +3 more
Gaia DR2 provides an unprecedented sample of stars with full 6D phase-space measurements, creating the need for a self-consistent means of discovering and characterizing the phase-space overdensities known as moving groups or associations. Here we present Chronostar, a new Bayesian analysis tool that meets this need. Chronostar uses the Expectatio…
The Galactic spiral structure as revealed by O- and early B-type stars
Wang, H. -F.; Huang, Y.; Chen, B. -Q. +7 more
We investigate the morphology and kinematics of the Galactic spiral structure based on a new sample of O- and early B-type stars. We select 6858 highly confident OB star candidates from the combined data of the VST Photometric H α Survey Data Release 2 (VPHAS+ DR2) and the Gaia Data Release 2 (Gaia DR2). Together with the O-B2 stars from the liter…
The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2
Gilmore, G.; Bayo, A.; Koposov, S. E. +25 more
The combination of precise radial velocities from multi-object spectroscopy and highly accurate proper motions from Gaia DR2 opens up the possibility for detailed 3D kinematic studies of young star-forming regions and clusters. Here, we perform such an analysis by combining Gaia-ESO Survey spectroscopy with Gaia astrometry for ∼900 members of the …
A dust and gas cavity in the disc around CQ Tau revealed by ALMA
Henning, Thomas; Kwon, Woojin; Testi, Leonardo +23 more
The combination of high-resolution and sensitivity offered by ALMA is revolutionizing our understanding of protoplanetary discs, as their bulk gas and dust distributions can be studied independently. In this paper we present resolved ALMA observations of the continuum emission (λ = 1.3 mm) and CO isotopologues (12CO, 13CO, C<…
SIGNALS: I. Survey description
Barmby, P.; Morisset, C.; Lyman, J. D. +61 more
SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H II regions in a sample of local extended galaxies. The programme will use the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope. Over 355 h (54.7 nigh…
The magnetic propeller accretion regime of LkCa 15
Moutou, C.; Ménard, F.; Carmona, A. +12 more
We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the ma…
Transverse kinematics of the Galactic bar-bulge from VVV and Gaia
Evans, N. Wyn; Sanders, Jason L.; Lucas, Philip +1 more
We analyse the kinematics of the Galactic bar-bulge using proper motions from the ESO public survey Vista Variables in the Via Lactea (VVV) and the second Gaia data release. Gaia has provided some of the first absolute proper motions within the bulge and the near-infrared VVV multi-epoch catalogue complements Gaia in highly extincted low-latitude …
The shapes of the rotation curves of star-forming galaxies over the last ≈10 Gyr
Bacon, Roland; Smail, Ian; Swinbank, A. M. +16 more
We analyse maps of the spatially resolved nebular emission of ≈1500 star-forming galaxies at z ≈ 0.6-2.2 from deep K-band Multi-Object Spectrograph and MUSE observations to measure the average shape of their rotation curves. We use these to test claims for declining rotation curves at large radii in galaxies at z ≈ 1-2 that have been interpreted a…
Particle re-acceleration and Faraday-complex structures in the RXC J1314.4-2515 galaxy cluster
Dallacasa, D.; Vazza, F.; Botteon, A. +9 more
Radio relics are sites of electron (re)acceleration in merging galaxy clusters but the mechanism of acceleration and the topology of the magnetic field in and near relics are yet to be understood. We are carrying out an observational campaign on double relic galaxy clusters starting with RXC J1314.4-2515. With Jansky Very Large Array multiconfigur…