Search Publications
The VLT-FLAMES Tarantula Survey. XXII. Multiplicity properties of the B-type stars
Howarth, I. D.; Dufton, P. L.; Simón-Díaz, S. +7 more
We investigate the multiplicity properties of 408 B-type stars observed in the 30 Doradus region of the Large Magellanic Cloud with multi-epoch spectroscopy from the VLT-FLAMES Tarantula Survey (VFTS). We use a cross-correlation method to estimate relative radial velocities from the helium and metal absorption lines for each of our targets. Object…
Linking dust emission to fundamental properties in galaxies: the low-metallicity picture
Ciesla, L.; Cooray, A.; Lebouteiller, V. +15 more
Aims: In this work, we aim to provide a consistent analysis of the dust properties from metal-poor to metal-rich environments by linking them to fundamental galactic parameters.
Methods: We consider two samples of galaxies: the Dwarf Galaxy Survey (DGS) and the Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel (KINGFIS…
Chains of dense cores in the Taurus L1495/B213 complex
Tafalla, M.; Hacar, A.
Context. Cloud fragmentation into dense cores is a critical step in the process of star formation. A number of recent observations show that it is connected to the filamentary structure of the gas, but the processes responsible for core formation remain mysterious.
Aims: We studied the kinematics and spatial distribution of the dense gas in t…
Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +186 more
Polarized emission observed by Planck HFI at 353 GHz towards a sample of nearby fields is presented, focusing on the statistics of polarization fractions p and angles ψ. The polarization fractions and column densities in these nearby fields are representative of the range of values obtained over the whole sky. We find that: (i) the largest polariz…
Are long gamma-ray bursts biased tracers of star formation? Clues from the host galaxies of the Swift/BAT6 complete sample of LGRBs . I. Stellar mass at z < 1
Le Floc'h, E.; Covino, S.; D'Avanzo, P. +20 more
Aims: Long gamma-ray bursts (LGRBs) are associated with massive stars and are therefore linked to star formation. However, the conditions needed for the progenitor stars to produce LGRBs can affect the relation between the LGRB rate and star formation. By using the power of a complete LGRB sample, our long-term aim is to understand whether su…
Self-consistent two-phase AGN torus models⋆. SED library for observers
Siebenmorgen, Ralf; Efstathiou, Andreas; Heymann, Frank
We assume that dust near active galactic nuclei (AGNs) is distributed in a torus-like geometry, which can be described as a clumpy medium or a homogeneous disk, or as a combination of the two (i.e. a two-phase medium). The dust particles considered are fluffy and have higher submillimeter emissivities than grains in the diffuse interstellar medium…
Evolution of column density distributions within Orion A⋆
Stutz, A. M.; Kainulainen, J.
We compare the structure of star-forming molecular clouds in different regions of Orion A to determine how the column density probability distribution function (N-PDF) varies with environmental conditions such as the fraction of young protostars. A correlation between the N-PDF slope and Class 0 protostar fraction has been previously observed in a…
Gravitational slopes, geomorphology, and material strengths of the nucleus of comet 67P/Churyumov-Gerasimenko from OSIRIS observations
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +49 more
Aims: We study the link between gravitational slopes and the surface morphology on the nucleus of comet 67P/Churyumov-Gerasimenko and provide constraints on the mechanical properties of the cometary material (tensile, shear, and compressive strengths).
Methods: We computed the gravitational slopes for five regions on the nucleus that are…
Understanding star formation in molecular clouds. I. Effects of line-of-sight contamination on the column density structure
André, Ph.; Schneider, N.; Ossenkopf, V. +6 more
Column-density maps of molecular clouds are one of the most important observables in the context of molecular cloud- and star-formation (SF) studies. With the Herschel satellite it is now possible to precisely determine the column density from dust emission, which is the best tracer of the bulk of material in molecular clouds. However, line-of-sig…
Star formation in the local Universe from the CALIFA sample. I. Calibrating the SFR using integral field spectroscopy data
Bomans, D. J.; Galbany, L.; Kennicutt, R. C. +24 more
Context. The star formation rate (SFR) is one of the main parameters used to analyze the evolution of galaxies through time. The need for recovering the light reprocessed by dust commonly requires the use of low spatial resolution far-infrared data. Recombination line luminosities provide an alternative, although uncertain dust-extinction correcti…