Search Publications
Dust, ice and gas in time (DIGIT): Herschel and Spitzer spectro-imaging of SMM3 and SMM4 in Serpens
van Dishoeck, E. F.; Evans, N. J.; Kristensen, L. E. +5 more
Context. Mid- and far-infrared observations of the environment around embedded protostars reveal a plethora of high excitation molecular and atomic emission lines. Different mechanisms for the origin of these lines have been proposed, including shocks induced by protostellar jets and radiation or heating by the embedded protostar of its immediate …
The interaction-driven starburst contribution to the cosmic star formation rate density
Fiore, F.; Santini, P.; Menci, N. +1 more
An increasing amount of observational evidence supports the notion that there are two modes of star formation: a quiescent mode in disk-like galaxies and a starburst mode, which is generally interpreted as driven by merging. Using a semi-analytic model of galaxy formation, we derive the relative contribution to the cosmic star formation rate densi…
Discovering young stars in the Gum 31 region with infrared observations
Grellmann, R.; Preibisch, T.; Roccatagliata, V. +4 more
Context. The Gum 31 bubble, which contains the stellar cluster NGC 3324, is a poorly studied young region close to the Carina Nebula.
Aims: We are aiming to characterise the young stellar and protostellar population in and around Gum 31 and to investigate the star-formation process in this region.
Methods: We identified candidate young s…
γ Doradus pulsation in two pre-main sequence stars discovered by CoRoT
Chaintreuil, S.; Ryabchikova, T.; Fossati, L. +5 more
Context. Pulsations in pre-main sequence stars have been discovered several times within the last years. But nearly all of these pulsators are of δ Scuti-type. γ Doradus-type pulsation in young stars has been predicted by theory, but lack observational evidence.
Aims: We present the investigation of variability caused by rotation and (γ Dorad…
The most complete and detailed X-ray view of the SNR Puppis A
Rodríguez-Pascual, P.; Giacani, E.; Smith, M. J. S. +3 more
Aims: With the purpose of producing the first detailed full view of Puppis A in X-rays, we carried out new XMM-Newton observations covering the missing regions in the southern half of the supernova remnant (SNR) and combined them with existing XMM-Newton and Chandra data.
Methods: Two pointings toward the south and southwest of Puppis A …
Cold gas in the inner regions of intermediate redshift clusters
Jablonka, P.; Combes, F.; Rines, K. +2 more
Determining the nature and modes of star formation at galactic scales requires an understanding of the relationship between the gas content of a galaxy and its star formation rate. Remarkable progress has been made in understanding the conversion mechanisms in field galaxies, but the cold and dense gas fueling the star formation in galaxies inside…
Herschel-ATLAS: Planck sources in the phase 1 fields
Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +32 more
We present the results of a cross-correlation of the Planck Early Release Compact Source catalogue (ERCSC) with the catalogue of Herschel-ATLAS sources detected in the phase 1 fields, covering 134.55°2. There are 28 ERCSC sources detected by Planck at 857 GHz in this area. As many as 16 of them are probably high Galactic latitude cirrus…
An interferometric study of the post-AGB binary 89 Herculis. I. Spatially resolving the continuum circumstellar environment at optical and near-IR wavelengths with the VLTI, NPOI, IOTA, PTI, and the CHARA Array
Chesneau, O.; Banerjee, D. P. K.; Verhoelst, T. +9 more
Context. Binary post-asymptotic giant branch (post-AGB) stars are interesting laboratories to study both the evolution of binaries as well as the structure of circumstellar disks.
Aims: A multiwavelength high angular resolution study of the prototypical object 89 Herculis is performed with the aim of identifying and locating the different emi…
Proper motions of young stars in Chamaeleon. I. A Virtual Observatory study of spectroscopically confirmed members
Bayo, A.; Solano, E.; Barrado, D. +3 more
Context. The study of the motion of the members of a given open cluster or stellar association provides key information about their formation and early evolution. The Chamaeleon cloud complex constitutes one of the closest and best studied low-mass star-forming regions in the Galaxy.
Aims: We want to provide further evidence of the origin of …
AKARI/IRC 18 µm survey of warm debris disks
Marshall, J. P.; White, G. J.; Nakagawa, T. +11 more
Context. Little is known about the properties of the warm (Tdust ≳ 150 K) debris disk material located close to the central star, which has a more direct link to the formation of terrestrial planets than does the low-temperature debris dust that has been detected to date.
Aims: To discover new warm debris disk candidates that show …