Search Publications
The CHESS survey of the L1157-B1 bow-shock: high and low excitation water vapor
Codella, C.; Ceccarelli, C.; Benedettini, M. +9 more
Context. Molecular outflows powered by young protostars strongly affect the kinematics and chemistry of the natal molecular cloud through strong shocks. This results in substantial modifications of the abundance of several species. In particular, water is a powerful tracer of shocked material because of its sensitivity to both physical conditions …
Clustering, host halos, and environment of z ~ 2 galaxies as a function of their physical properties
Dickinson, Mark; Daddi, Emanuele; Finoguenov, Alexis +13 more
Using a sample of 25 683 star-forming and 2821 passive galaxies at z ~ 2, selected in the COSMOS field following the BzK color criterion, we study the hosting halo mass and environment of galaxies as a function of their physical properties. Spitzer and Herschel allow us to obtain accurate star formation rate estimates for starburst galaxies. We me…
Herschel/HIFI observations of ionised carbon in the β Pictoris debris disk
Fridlund, M.; Olofsson, G.; Liseau, R. +9 more
Context. The dusty debris disk around the ~20 Myr old main-sequence A-star β Pictoris is known to contain gas. Evidence points towards a secondary origin of the gas as opposed to being a direct remnant from the initial protoplanetary disk, although the dominant gas production mechanism is so far not identified. The origin of the observed overabund…
Blowing in the wind: The dust wave around σ Orionis AB
Kaper, L.; Tielens, A. G. G. M.; Berné, O. +5 more
Observations obtained with the Spitzer Space Telescope and the WISE satellite have revealed a prominent arc-like structure at 50'' (≃0.1 pc) from the O9.5V/B0.5V system σ Ori AB. We measure a total dust mass of 2.3 ± 1.5 × 10-5 M⊙. The derived dust-to-gas mass ratio is ≃0.29 ± 0.20. We attribute this dust structure to the int…
Hidden starbursts and active galactic nuclei at 0 < z < 4 from the Herschel-VVDS-CFHTLS-D1 field: Inferences on coevolution and feedback
Le Floc'h, E.; Ilbert, O.; Zamorani, G. +12 more
We investigate of the properties of ~2000 Herschel/SPIRE far-infrared-selected galaxies from 0 <z< 4 in the CFHTLS-D1 field. Using a combination of extensive spectroscopy from the VVDS and ORELSE surveys, deep multiwavelength imaging from CFHT, VLA, Spitzer, XMM-Newton, and Herschel, and well-calibrated spectral energy distribution fitting, …
Radiative and mechanical feedback into the molecular gas of NGC 253
van der Werf, P. P.; Güsten, R.; Requena-Torres, M. A. +5 more
Starburst galaxies are galaxies or regions of galaxies undergoing intense periods of star formation. Understanding the heating and cooling mechanisms in these galaxies can give us insight to the driving mechanisms that fuel the starburst. Molecular emission lines play a crucial role in the cooling of the excited gas. With Herschel Spectral and Pho…
Joint astrometric solution of HIPPARCOS and Gaia. A recipe for the Hundred Thousand Proper Motions project
Michalik, Daniel; Lindegren, Lennart; Hobbs, David +1 more
Context. The first release of astrometric data from Gaia is expected in 2016. It will contain the mean stellar positions and magnitudes from the first year of observations. For more than 100 000 stars in common with the Hipparcos Catalogue it will be possible to compute very accurate proper motions due to the time difference of about 24 years betw…
Overview and stellar statistics of the expected Gaia Catalogue using the Gaia Object Generator
Jordi, C.; Luri, X.; Arenou, F. +13 more
Aims: An effort has been made to simulate the expected Gaia Catalogue, including the effect of observational errors. We statistically analyse this simulated Gaia data to better understand what can be obtained from the Gaia astrometric mission. This catalogue is used to investigate the potential yield in astrometric, photometric, and spectrosc…
Galaxy population properties of the massive X-ray luminous galaxy cluster XDCP J0044.0-2033 at z = 1.58. Red-sequence formation, massive galaxy assembly, and central star formation activity
Lidman, C.; Castellano, M.; Pentericci, L. +20 more
Context. Recent observational progress has enabled the detection of galaxy clusters and groups out to very high redshifts and for the first time allows detailed studies of galaxy population properties in these densest environments in what was formerly known as the "redshift desert" at z> 1.5.
Aims: We aim to investigate various galaxy popu…
Diversity of chemistry and excitation conditions in the high-mass star forming complex W33
Immer, K.; Galván-Madrid, R.; König, C. +2 more
The object W33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed H ii regions. Since its star forming regions are located at the same distance and the primary material of the birth clouds is probably similar, we conducted a comparative chemical study to trace the chemica…