Search Publications
Molecular gas mass functions of normal star-forming galaxies since z ~ 3
Berta, S.; Magnelli, B.; Nordon, R. +7 more
We used deep far-infrared data from the PEP/GOODS-Herschel surveys and restframe ultraviolet photometry to study the evolution of the molecular gas mass function of normal star-forming galaxies. Computing the molecular gas mass, Mmol, by scaling star formation rates through depletion timescales, or combining infrared (IR) luminosity and…
Unveiling shocks in planetary nebulae
Toalá, Jesús A.; Guerrero, Martín A.; Miranda, Luis F. +4 more
The propagation of a shock wave into a medium is expected to heat the material beyond the shock, producing noticeable effects in intensity line ratios such as [O iii]/Hα. To investigate the occurrence of shocks in planetary nebulae (PNe), we have used all narrow-band [O iii] and Hα images of PNe available in the HST archive to build their [O iii]/…
Pillars and globules at the edges of H ii regions. Confronting Herschel observations and numerical simulations
Hill, T.; White, G. J.; Roussel, H. +24 more
Context. Herschel far-infrared imaging observations have revealed the density structure of the interface between H ii regions and molecular clouds in great detail. In particular, pillars and globules are present in many high-mass star-forming regions, such as the Eagle nebula (M 16) and the Rosette molecular cloud, and understanding their origin w…
OH/IR stars and their superwinds as observed by the Herschel Space Observatory
Waters, L. B. F. M.; Teyssier, D.; Justtanont, K. +4 more
Aims: In order to study the history of mass loss in extreme OH/IR stars, we observed a number of these objects using CO as a tracer of the density and temperature structure of their circumstellar envelopes.
Methods: Combining CO observations from the Herschel Space Observatory with those from the ground, we trace mass loss rates as a fun…
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…