Search Publications
ALMA observations of the Red Rectangle, a preliminary analysis
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +5 more
Aims: We aim to study equatorial disks in rotation and axial outflows in post-AGB objects so as to disclose the formation and shaping mechanisms in planetary nebulae. So far, both disks and outflows have not been observed simultaneously.
Methods: We obtained high-quality ALMA observations of 12CO and 13CO J = 3-2 an…
Waterfalls around protostars. Infall motions towards Class 0/I envelopes as probed by water
van Dishoeck, E. F.; Bruderer, S.; Kristensen, L. E. +4 more
Context. For stars to form, material must fall inwards from core scales through the envelope towards the central protostar. While theories of how this takes place have been around for some time, the velocity profile around protostars is poorly constrained. The combination of observations in multiple transitions of a tracer which is sensitive to ki…
The CORALIE survey for southern extrasolar planets. XVII. New and updated long period and massive planets
Alonso, R.; Queloz, D.; Sahlmann, J. +24 more
Context. Since 1998, a planet-search program around main sequence stars within 50 pc in the southern hemisphere has been carried out with the CORALIE echelle spectrograph at La Silla Observatory.
Aims: With an observing time span of more than 14 years, the CORALIE survey is now able to unveil Jovian planets on Jupiter's period domain. This gr…
Returning magnetic flux in sunspot penumbrae
Ruiz Cobo, B.; Asensio Ramos, A.
Aims: We study the presence of reversed polarity magnetic flux in sunspot penumbra.
Methods: We applied a new regularized method to deconvolve spectropolarimetric data observed with the spectropolarimeter SP onboard Hinode. The new regularization is based on a principal component decomposition of the Stokes profiles. The resulting Stokes…
The galaxy stellar mass function and its evolution with time show no dependence on global environment
Moretti, A.; Vulcani, B.; Halliday, C. +7 more
We present an analysis of the galaxy stellar mass function in different environments at intermediate redshift (0.3 ≤ z ≤ 0.8) for two mass-limited galaxy samples. We use the IMACS Cluster Building Survey (ICBS; M∗ ≥ 1010.5 M⊙) to study cluster, group and field galaxies at z = 0.3-0.45, and the ESO Distant Cluster S…
High-J CO survey of low-mass protostars observed with Herschel-HIFI
van Dishoeck, E. F.; Karska, A.; Fuente, A. +8 more
Context. In the deeply embedded stage of star formation, protostars start to heat and disperse their surrounding cloud cores. The evolution of these sources has traditionally been traced through dust continuum spectral energy distributions (SEDs), but the use of CO excitation as an evolutionary probe has not yet been explored due to the lack of hi…
Obscured AGN at z ~ 1 from the zCOSMOS-Bright Survey. I. Selection and optical properties of a [Ne v]-selected sample
Kneib, J. -P.; Cimatti, A.; Silverman, J. D. +46 more
Aims: The application of multi-wavelength selection techniques is essential for obtaining a complete and unbiased census of active galactic nuclei (AGN). We present here a method for selecting z ~ 1 obscured AGN from optical spectroscopic surveys.
Methods: A sample of 94 narrow-line AGN with 0.65 < z < 1.20 was selected from the 20…
Multiple spiral patterns in the transitional disk of HD 100546
Quanz, S. P.; Augereau, J. -C.; Pantin, E. +3 more
Context. Protoplanetary disks around young stars harbor many structures related to planetary formation. Of particular interest, spiral patterns were discovered among several of these disks and are expected to be the sign of gravitational instabilities leading to giant planet formation or gravitational perturbations caused by already existing plane…
Swift heavy ion irradiation of water ice from MeV to GeV energies. Approaching true cosmic ray compaction
Dartois, E.; Chabot, M.; Brunetto, R. +11 more
Context. Cosmic ray ion irradiation affects the chemical composition of and triggers physical changes in interstellar ice mantles in space. One of the primary structural changes induced is the loss of porosity, and the mantles evolve toward a more compact amorphous state. Previously, ice compaction was monitored at low to moderate ion energies. Th…
The XMM deep survey in the CDF-S. IV. Compton-thick AGN candidates
Elbaz, D.; Fritz, J.; Vignali, C. +15 more
The Chandra Deep Field is the region of the sky with the highest concentration of X-ray data available: 4 Ms of Chandra and 3 Ms of XMM-Newton data, allowing excellent quality spectra to be extracted even for faint sources. We took advantage of this to compile a sample of heavily obscured active galactic nuclei (AGN) using X-ray spectroscopy. We s…