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تعداد نتایج: 201 فیلتر نتایج به سال:
In the perspective of nuclear waste storage, 63 Ni is one of the radio-elements of primary concern. Modeling of its retention in clay formations is usually performed using modeling approaches which consider that only phyllosilicates participate to retention. However, isotopic exchange with stable nickel contained in phases (i.e. minerals and organic matter) from the clay formation may play a ro...
We have used the new extended A configuration of the IRAM Plateau de Bure interferometer to study the dense molecular gas in the nucleus of the nearby spiral galaxy NGC 6946 at unprecedented spatial resolution in the HCN(1-0) and 12 CO(2-1) lines. The gas distribution in the central 50 pc has been resolved and is consistent with a gas ring or spiral driven by the inner 400 pc long stellar bar. ...
We report the redshift of an unlensed, highly obscured submillimetre galaxy (SMG), HS1700.850.1, the brightest SMG (S850μm = 19.1 mJy) detected in the James Clerk Maxwell Telescope/Submillimetre Common-user Bolometer Array-2 (JCMT/SCUBA-2) Baryonic Structure Survey, based on the detection of its 12CO line emission. Using the Institute Radio Astronomie Millimetrique Plateau de Bure Interferomete...
We present IRAM Plateau de Bure Interferometer 3 mm observations of CO J(1→0) emission in two 24μm-selected starburst galaxies in the outskirts (∼2–3Rvirial) of the rich cluster Cl 0024+16 (z = 0.395). The galaxies’ inferred far-infrared luminosities place them in the luminous infrared galaxy class (LIRGs, LFIR > 10L⊙), with star formation rates of ∼60M⊙ yr. Strong CO J(1→0) emission is detecte...
The present paper focuses on IRSN structural studies aiming at assessing the existence of tectonic structures in the Callovo-Oxfordian clay formation and their potential role on radionuclide transport. IRSN has first determined the type of fracturing that could be present in the Callovo-Oxfordian, by carrying out surface fieldwork in Meuse/Haute-Marne and investigations in clay and limestone la...
Aims. Our objectives are to determine the properties of the interstellar medium (ISM) and of star formation in typical star-forming galaxies at high redshift. Methods. Following up on our previous multi-wavelength observations with HST, Spitzer, Herschel, and the Plateau de Bure Interferometer (PdBI), we have studied a strongly lensed z = 2.013 galaxy, the arc behind the galaxy cluster MACS J04...
We present the first high angular resolution 1.4mm and 2.7mm continuum maps of the TTauri binary system HKTau obtained with the Plateau de Bure Interferometer. The contributions of both components are well disentangled at 1.4mm and the star previously known to host an edge-on circumstellar disk, HKTauB, is elongated along the disk’s major axis. The optically bright primary dominates the thermal...
Recent studies suggest that infrared dark clouds (IRDCs) have the potential of harboring the earliest stages of massive star formation and indeed evidence for this is found toward distinct regions within them. We present a study with the Plateau de Bure Interferometer of a core in the archetypal filamentary IRDC G11.11-0.12 of a few arcsecond resolution to determine its physical and chemical st...
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z = 6.419. The CO (J =6→5) and (J =7→6) lines were detected using the IRAM Plateau de Bure interferometer, showing a width of ≈ 280 kms. An upper flux limit for the CO (J =1→0) line was obtained from observations with the Effelsberg ...
Using the IRAM Plateau de Bure interferometer (PdBI), we report the detection of water vapor in six new lensed ultra-luminous starburst galaxies at high redshift, discovered in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). The sources are detected either in the 202−111 or 211−202 H2O emission lines with integrated line fluxes ranging from 1.8 to 14 Jy km s−1. The correspondi...
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