Search Publications
Molecular line emission in NGC 1068 imaged with ALMA. I. An AGN-driven outflow in the dense molecular gas
Tacconi, L. J.; Hunt, L. K.; Colina, L. +23 more
Aims: We investigate the fueling and the feedback of star formation and nuclear activity in
Methods: We have used the A…
The frequency of planetary debris around young white dwarfs
Gänsicke, B. T.; Koester, D.; Farihi, J.
Context. Heavy metals in the atmospheres of white dwarfs are thought in many cases to be accreted from a circumstellar debris disk, which was formed by the tidal disruption of a rocky planetary body within the Roche radius of the star. The abundance analysis of photospheric elements and conclusions about the chemical composition of the accreted ma…
Metallicity evolution, metallicity gradients, and gas fractions at z ~ 3.4
Cimatti, A.; Maiolino, R.; Pentericci, L. +9 more
We used near-infrared integral field spectroscopic observations from the AMAZE and LSD ESO programs to constrain the metallicity in a sample of 40 star-forming galaxies at 3 < z < 5 (most of which are at z ~ 3.4). We measured metallicities by exploiting strong emission-line diagnostics. We found that a significant fraction of star-forming ga…
The Wolf-Rayet stars in the Large Magellanic Cloud. A comprehensive analysis of the WN class
Foellmi, C.; Hamann, W. -R.; Oskinova, L. M. +6 more
Context. Massive stars, although being important building blocks of galaxies, are still not fully understood. This especially holds true for Wolf-Rayet (WR) stars with their strong mass loss, whose spectral analysis requires adequate model atmospheres.
Aims: Following our comprehensive studies of the WR stars in the Milky Way, we now present …
Properties of z ~ 3-6 Lyman break galaxies. II. Impact of nebular emission at high redshift
Schaerer, D.; Stark, D. P.; de Barros, S.
Context. To gain insight on the mass assembly and place constraints on the star formation history (SFH) of Lyman break galaxies (LBGs), it is important to accurately determine their properties.
Aims: We estimate how nebular emission and different SFHs affect parameter estimation of LBGs.
Methods: We present a homogeneous, detailed analys…
The VLT-FLAMES Tarantula Survey. XVII. Physical and wind properties of massive stars at the top of the main sequence
Crowther, P. A.; Herrero, A.; Simón-Díaz, S. +12 more
The evolution and fate of very massive stars (VMS) is tightly connected to their mass-loss properties. Their initial and final masses differ significantly as a result of mass loss. VMS have strong stellar winds and extremely high ionising fluxes, which are thought to be critical sources of both mechanical and radiative feedback in giant H ii regio…
The evolution of massive stars and their spectra. I. A non-rotating 60 M⊙ star from the zero-age main sequence to the pre-supernova stage
Meynet, Georges; Groh, Jose H.; Ekström, Sylvia +1 more
For the first time, the interior and spectroscopic evolution of a massive star is analyzed from the zero-age main sequence (ZAMS) to the pre-supernova (SN) stage. For this purpose, we combined stellar evolution models using the Geneva code and stellar atmospheric/wind models using CMFGEN. With our approach, we were able to produce observables, suc…
A library of near-infrared integral field spectra of young M-L dwarfs
Pinte, C.; Homeier, D.; Lagrange, A. -M. +5 more
Context. At young ages, low surface gravity affects the atmospheric properties of ultracool dwarfs. The impact on medium-resolution near-infrared (NIR) spectra has only been slightly investigated at the M-L transition so far.
Aims: We present a library of NIR (1.1-2.45 µm) medium-resolution (R ~ 1500-2000) integral field spectra of 15 y…
ALMA reveals the feeding of the Seyfert 1 nucleus in NGC 1566
Tacconi, L. J.; Hunt, L. K.; Krips, M. +9 more
We report ALMA observations of CO(3-2) emission in the Seyfert 1 galaxy NGC 1566, at a spatial resolution of 25 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central kpc, and to probe nuclear fueling and feedback phenomena. NGC 1566 has a nuclear bar of 1.7 kpc radius and a conspicuous grand design spiral starting…
ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z = 4.8
Smail, Ian; Maiolino, Roberto; Caselli, Paola +9 more
We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [Cii] observations of the z = 4.7555 submillimetre galaxy, ALESS 73.1. Our 0.̋5 FWHM map resolves the [Cii] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, vrot…