Search Publications
Unveiling the σ-discrepancy. II. Revisiting the Evolution of ULIRGs and the Origin of Quasars
Sanders, D. B.; Rothberg, Barry; Rodrigues, Myriam +1 more
We present the first central velocity dispersions (σcircle) measured from the 0.85 µm Calcium II Triplet (CaT) for eight advanced (i.e., single nuclei) local (z <= 0.15) Ultraluminous Infrared Galaxies (ULIRGs). First, these measurements are used to test the prediction that the "σ-Discrepancy," in which the CaT σcircle
Growth index after the Planck results
Xu, Lixin
The growth index γL was proposed to investigate the possible deviation from the standard ΛCDM model and Einstein’s gravity theory in a dynamical perspective. Recently, thanks to the measurement of the cosmic growth rate via the redshift-space distortion, one can understand the evolution of the density contrast through fσ8(z),…
Dications and thermal ions in planetary atmospheric escape
Simon Wedlund, C.; Ehrenreich, D.; Witasse, O. +4 more
In the recent years, the presence of dications in the atmospheres of Mars, Venus, Earth and Titan has been modeled and assessed. These studies also suggested that these ions could participate to the escape of the planetary atmospheres because a large fraction of them is unstable and highly energetic. When they dissociate, their internal energy is …
A systematic mapping procedure based on the Modified Gaussian Model to characterize magmatic units from olivine/pyroxenes mixtures: Application to the Syrtis Major volcanic shield on Mars
Bibring, Jean-Pierre; Gondet, Brigitte; Bellucci, Giancarlo +7 more
et al. (2011) have developed an adapted version of the Modified Gaussian Model (MGM). The improvements allow the characterization of spectra of olivine-pyroxene(s) mixtures, addressing both modal composition and individual minerals chemical composition. This version of MGM is fully automated and operational with large amounts of hyperspectral imag…
Mapping water in protostellar outflows with Herschel. PACS and HIFI observations of L1448-C
Liseau, R.; Codella, C.; Benedettini, M. +13 more
Context. Water is a key probe of shocks and outflows from young stars because it is extremely sensitive to both the physical conditions associated with the interaction of supersonic outflows with the ambient medium and the chemical processes at play.
Aims: Our goal is to investigate the spatial and velocity distribution of H2O alon…
Combined IRAM and Herschel/HIFI study of cyano(di)acetylene in Orion KL: tentative detection of DC3N
Cernicharo, José; Viti, Serena; Palau, Aina +8 more
Context. We present a study of cyanoacetylene (HC3N) and cyanodiacetylene (HC5N) in Orion KL using observations from two line surveys performed with the IRAM 30-m telescope and the HIFI instrument onboard the Herschel telescope. The frequency ranges covered are 80-280 GHz and 480-1906 GHz.
Aims: This study (divided by fa…
Impact flux on Jupiter: From superbolides to large-scale collisions
Hueso, R.; Sánchez-Lavega, A.; Delcroix, M. +21 more
Context. Regular observations of Jupiter by a large number of amateur astronomers have resulted in the serendipitous discovery of short bright flashes in its atmosphere, which have been proposed as being caused by impacts of small objects. Three flashes were detected: one on June 3, 2010, one on August 20, 2010, and one on September 10, 2012.
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Moduli dark matter and the search for its decay line using Suzaku x-ray telescope
Loewenstein, Michael; Kusenko, Alexander; Yanagida, Tsutomu T.
Light scalar fields called moduli arise from a variety of different models involving supersymmetry and/or string theory; thus their existence is a generic prediction of leading theories for physics beyond the standard model. They also present a formidable, long-standing problem for cosmology. We argue that an anthropic solution to the moduli probl…
Quasiperiodic emissions observed by the Cluster spacecraft and their association with ULF magnetic pulsations
Pickett, J. S.; Santolík, O.; Parrot, M. +2 more
Quasiperiodic (QP) emissions are electromagnetic waves at frequencies of about 0.5-4 kHz characterized by a periodic time modulation of the wave intensity, with a typical modulation period on the order of minutes. We present results of a survey of QP emissions observed by the Wide-Band Data (WBD) instruments on board the Cluster spacecraft. All WB…
A Non-LTE Analysis of the Hot Subdwarf O Star BD+28°4211. I. The UV Spectrum
Latour, M.; Chayer, P.; Fontaine, G. +1 more
We present a detailed analysis of the UV spectrum of the calibration star BD+28°4211 using high-quality spectra obtained with the Hubble Space Telescope and Far-Ultraviolet Spectroscopic Explorer satellites. To this aim, we compare quantitatively the observed data with model spectra obtained from state-of-the-art non-LTE metal line-blanketed model…