Search Publications
Old and young stellar populations in DustPedia galaxies and their role in dust heating
Bianchi, S.; Fritz, J.; Madden, S. C. +19 more
Aims: Within the framework of the DustPedia project we investigate the properties of cosmic dust and its interaction with stellar radiation (originating from different stellar populations) for 814 galaxies in the nearby Universe, all observed by the Herschel Space Observatory.
Methods: We take advantage of the widely used fitting code CI…
Reclassification of Cepheids in the Gaia Data Release 2. Period-luminosity and period-Wesenheit relations in the Gaia passbands
Ripepi, V.; Molinaro, R.; Eyer, L. +3 more
Context. Classical Cepheids are the most important primary indicators for the extragalactic distance scale. Establishing the precise zero points of their period-luminosity and period-Wesenheit (PL/PW) relations has profound consequences on the estimate of H0. Type II Cepheids are also important distance indicators and tracers of old ste…
The Galactic WC and WO stars. The impact of revised distances from Gaia DR2 and their role as massive black hole progenitors
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +4 more
Wolf-Rayet stars of the carbon sequence (WC stars) are an important cornerstone in the late evolution of massive stars before their core collapse. As core-helium burning, hydrogen-free objects with huge mass-loss, they are likely the last observable stage before collapse and thus promising progenitor candidates for type Ib/c supernovae. Their stro…
PHIBSS2: survey design and z = 0.5 - 0.8 results. Molecular gas reservoirs during the winding-down of star formation
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +29 more
Following the success of the Plateau de Bure high-z Blue Sequence Survey (PHIBSS), we present the PHIBSS2 legacy program, a survey of the molecular gas properties of star-forming galaxies on and around the star-formation main sequence (MS) at different redshifts using IRAM's NOrthern Extended Millimeter Array (NOEMA). This survey significantly ext…
Gaia DR2 reveals a star formation burst in the disc 2-3 Gyr ago
Luri, X.; Figueras, F.; Mor, R. +2 more
We use Gaia data release 2 (DR2) magnitudes, colours, and parallaxes for stars with G < 12 to explore a parameter space with 15 dimensions that simultaneously includes the initial mass function (IMF) and a non-parametric star formation history (SFH) for the Galactic disc. This inference is performed by combining the Besançon Galaxy Model fast a…
Gaia DR2 unravels incompleteness of nearby cluster population: new open clusters in the direction of Perseus
Castro-Ginard, A.; Jordi, C.; Cantat-Gaudin, T. +13 more
Context. Open clusters (OCs) are popular tracers of the structure and evolutionary history of the Galactic disc. The OC population is often considered to be complete within 1.8 kpc of the Sun. The recent Gaia Data Release 2 (DR2) allows the latter claim to be challenged.
Aims: We perform a systematic search for new OCs in the direction of Per…
The echo of the bar buckling: Phase-space spirals in Gaia Data Release 2
Gerhard, Ortwin; Khoperskov, Sergey; Di Matteo, Paola +5 more
We present a high-resolution numerical study of the phase-space diversity in an isolated Milky Way-type galaxy. Using a single N-body simulation (N ≈ 0.14 × 109) we explore the formation, evolution, and spatial variation of the phase-space spirals similar to those recently discovered by Antoja et al. in the Milky Way disk with Gaia Data…
KiDS+VIKING-450: A new combined optical and near-infrared dataset for cosmology and astrophysics
Sifón, Cristóbal; Heymans, Catherine; Kuijken, Konrad +22 more
We present the curation and verification of a new combined optical and near infrared dataset for cosmology and astrophysics, derived by combining ugri-band imaging from the Kilo-Degree Survey (KiDS) and ZYJHKs-band imaging from the VISTA Kilo degree Infrared Galaxy (VIKING) survey. This dataset is unrivaled in cosmological imaging surve…
The population of hot subdwarf stars studied with Gaia. II. The Gaia DR2 catalogue of hot subluminous stars
Geier, S.; Marsh, T. R.; Raddi, R. +1 more
Based on data from the ESA Gaia Data Release 2 (DR2) and several ground-based, multi-band photometry surveys we have compiled an all-sky catalogue of 39 800 hot subluminous star candidates selected in Gaia DR2 by means of colour, absolute magnitude, and reduced proper motion cuts. We expect the majority of the candidates to be hot subdwarf stars o…
VLT/FLAMES high-resolution chemical abundances in Sculptor: a textbook dwarf spheroidal galaxy
Spite, M.; Skúladóttir, Á.; Jablonka, P. +12 more
We present detailed chemical abundances for 99 red-giant branch stars in the centre of the Sculptor dwarf spheroidal galaxy, which have been obtained from high-resolution VLT/FLAMES spectroscopy. The abundances of Li, Na, α-elements (O, Mg, Si, Ca Ti), iron-peak elements (Sc, Cr, Fe, Co, Ni, Zn), and r- and s-process elements (Ba, La, Nd, Eu) were…