Search Publications
Comparative study of CH+ and SH+ absorption lines observed towards distant star-forming regions⋆⋆⋆
Menten, K. M.; Falgarone, E.; Godard, B. +8 more
Aims: The HIFI instrument onboard Herschel has allowed high spectral resolution and sensitive observations of ground-state transitions of three molecular ions: the methylidyne cation CH+, its isotopologue 13CH+, and sulfanylium SH+. Because of their unique chemical properties, a comparative analysis…
A Jet Break in the X-Ray Light Curve of Short GRB 111020A: Implications for Energetics and Rates
Troja, E.; Sakamoto, T.; Berger, E. +8 more
We present broadband observations of the afterglow and environment of the short GRB 111020A. An extensive X-ray light curve from Swift/XRT, XMM-Newton, and Chandra, spanning ~100 s to 10 days after the burst, reveals a significant break at δt ≈ 2 days with pre- and post-break decline rates of α X, 1 ≈ -0.78 and α X, 2 <~ -…
A Suzaku survey of Fe K lines in Seyfert 1 active galactic nuclei
Porquet, D.; Reeves, J. N.; Braito, V. +3 more
We construct full broad-band models in an analysis of Suzaku observations of nearby Seyfert 1 active galactic nuclei (AGN) (z ≤ 0.2) with exposures >50 ks and with greater than 30 000 counts in order to study their iron line profiles. This results in a sample of 46 objects and 84 observations. After a full modelling of the broad-band Suzaku and…
A chronology of early Mars climatic evolution from impact crater degradation
Mangold, N.; Ansan, V.; Adeli, S. +2 more
The degradation of impact craters provides a powerful tool to analyze surface processes in the Martian past. Previous studies concluded that large impact craters (20-200 km in diameter) were strongly degraded by fluvial erosion during early Martian history. Our goal is to study the progression of crater degradation through time with a particular e…
A remarkably high fraction of strong Lyα emitters amongst luminous redshift 6.0 < z < 6.5 Lyman-break galaxies in the UKIDSS Ultra-Deep Survey
McLure, R. J.; Dunlop, J. S.; Cirasuolo, M. +8 more
We present spectroscopic confirmation of 10 highly luminous (L≥ 2L★) Lyα emitters (LAEs) in the redshift range 6.01 < z < 6.49 (nine galaxies and one active galactic nucleus), initially drawn from a sample of 14 zphot≥ 6 Lyman-break galaxies (LBGs) selected from an area of 0.25 deg2 within the UK Infrared Dee…
Detection of Small-Scale Structures in the Dissipation Regime of Solar-Wind Turbulence
Perri, S.; Sahraoui, F.; Goldstein, M. L. +1 more
Recent observations of the solar wind have pointed out the existence of a cascade of magnetic energy from the scale of the proton Larmor radius ρp down to the electron Larmor radius ρe scale. In this Letter we study the spatial properties of magnetic field fluctuations in the solar wind and find that at small scales the magne…
A weak lensing mass reconstruction of the large-scale filament feeding the massive galaxy cluster MACS J0717.5+3745
Richard, Johan; Leauthaud, Alexie; Massey, Richard +6 more
We report the first weak lensing detection of a large-scale filament funnelling matter on to the core of the massive galaxy cluster MACS J0717.5+3745.
Our analysis is based on a mosaic of 18 multipassband images obtained with the Advanced Camera for Surveys aboard the Hubble Space Telescope, covering an area of ∼10 × 20 arcmin2. We…A study of deuterated water in the low-mass protostar IRAS 16293-2422
Ceccarelli, C.; Caux, E.; Vastel, C. +6 more
Context. Water is a primordial species in the emergence of life, and comets may have brought a large fraction to Earth to form the oceans. To understand the evolution of water from the first stages of star formation to the formation of planets and comets, the HDO/H2O ratio is a powerful diagnostic.
Aims: Our aim is to determine pre…
A Statistical Approach to Recognizing Source Classes for Unassociated Sources in the First Fermi-LAT Catalog
Ozaki, M.; Troja, E.; Caraveo, P. A. +174 more
The Fermi Large Area Telescope (LAT) First Source Catalog (1FGL) provided spatial, spectral, and temporal properties for a large number of γ-ray sources using a uniform analysis method. After correlating with the most-complete catalogs of source types known to emit γ rays, 630 of these sources are "unassociated" (i.e., have no obvious counterparts…
Cepheid Period-Luminosity Relations in the Near-infrared and the Distance to M31 from the Hubble Space Telescope Wide Field Camera 3
Riess, Adam G.; Valls-Gabaud, David; Fliri, Jürgen
We present measurements of 68 classical Cepheids, most detected from the Canada-France-Hawaii Telescope POMME Survey, with periods from 10 to 78 days observed in the near-infrared by the Panchromatic Hubble Andromeda Treasury Program using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The combination of HST's resolution and t…