723 research outputs found
ALMA observations of the vibrationally-excited rotational CO transition towards five AGB stars
We report the serendipitous detection with ALMA of the vibrationally-excited
pure-rotational CO transition towards five asymptotic giant branch
(AGB) stars, Cet, R Aqr, R Scl, W Aql, and Gru. The observed lines
are formed in the poorly-understood region located between the stellar surface
and the region where the wind starts, the so-called warm molecular layer. We
successfully reproduce the observed lines profiles using a simple model. We
constrain the extents, densities, and kinematics of the region where the lines
are produced. R Aqr and R Scl show inverse P-Cygni line profiles which indicate
infall of material onto the stars. The line profiles of Cet and R Scl show
variability. The serendipitous detection towards these five sources shows that
vibrationally-excited rotational lines can be observed towards a large number
of nearby AGB stars using ALMA. This opens a new possibility for the study of
the innermost regions of AGB circumstellar envelopes.Comment: 6 pages, 2 figures, 2 tables, 2016MNRAS.463L..74
Rotational inhomogeneities from pre-big bang?
The evolution of the rotational inhomogeneities is investigated in the
specific framework of four-dimensional pre-big bang models. While minimal
(dilaton-driven) scenarios do not lead to rotational fluctuations, in the case
of non-minimal (string-driven) models, fluid sources are present in the pre-big
bang phase. The rotational modes of the geometry, coupled to the divergenceless
part of the velocity field, can then be amplified depending upon the value of
the barotropic index of the perfect fluids. In the light of a possible
production of rotational inhomogeneities, solutions describing the coupled
evolution of the dilaton field and of the fluid sources are scrutinized in both
the string and Einstein frames. In semi-realistic scenarios, where the
curvature divergences are regularized by means of a non-local dilaton
potential, the rotational inhomogeneities are amplified during the pre-big bang
phase but they decay later on. Similar analyses can also be performed when a
contraction occurs directly in the string frame metric.Comment: 21 pages, corrected typos, references added; to appear in Class.
Quantum Gra
Electron-Hole Tunneling Revealed by Quantum Oscillations in the Nodal-Line Semimetal HfSiS
We report a study of quantum oscillations in the high-field magnetoresistance of the nodal-line semimetal HfSiS. In the presence of a magnetic field up to 31 T parallel to the c axis, we observe quantum oscillations originating both from orbits of individual electron and hole pockets, and from magnetic breakdown between these pockets. In particular, we reveal a breakdown orbit enclosing one electron and one hole pocket in the form of a âfigure of eight,â which is a manifestation of Klein tunneling in momentum space, although in a regime of partial transmission due to the finite separation between the pockets. The observed very strong dependence of the oscillation amplitude on the field angle and the cyclotron masses of the orbits are in agreement with the theoretical predictions for this novel tunneling phenomenon
Field-induced quasi-particle tunneling in the nodal-line semimetal HfSiS revealed by de Haas-van Alphen quantum oscillations
We present a de Haasâvan Alphen quantum oscillation study of the Dirac nodal-line semimetal HfSiS up to 32Â T to unravel the structure of the high-frequency magnetic breakdown spectrum that was previously obscured in transport experiments. Despite a threefold enhanced gap between adjacent electron and hole pockets relative to the sister compound ZrSiS, a large number of large-area magnetic breakdown orbits enclosing the nodal-loop are identified. All breakdown orbits are assigned by extracting their cyclotron masses. Moreover, one additional low-frequency magnetic breakdown orbit, previously absent in ZrSiS, is observed and attributed to the larger spin-orbit interaction in HfSiS
Post-Hematopoietic Stem Cell Transplantation (HSCT) Outcomes in Patients With AML Transplanted Prior to Achieving Platelet Recovery
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A phase 1 study assessing the feasibility and safety of intraductal pegylated liposomal doxorubicin (PLD) in women awaiting mastectomy
A Management Capacity Assessment of Selected Coral Reef Marine Protected Areas in the Caribbean
Reduced Intensity Conditioning (RIC) Regimen Followed By Allogeneic Hematopoietic Stem Cell Transplantation (HSCT) In Adult Patients (PTS) With Acute Lymphoblastic Leukemia (ALL)
A high resolution line survey of IRC+10216 with Herschel. First results: Detection of warm silicon dicarbide SiC2
We present the first results of a high-spectral-resolution survey of the
carbon-rich evolved star IRC+10216 that was carried out with the HIFI
spectrometer onboard Herschel. This survey covers all HIFI bands, with a
spectral range from 488 to 1901GHz. In this letter we focus on the band-1b
spectrum, in a spectral range 554.5-636.5GHz, where we identified 130 spectral
features with intensities above 0.03 K and a signal-to-noise ratio >5. Detected
lines arise from HCN, SiO, SiS, CS, CO, metal-bearing species and,
surprisingly, silicon dicarbide (SiC2). We identified 55 SiC2 transitions
involving energy levels between 300 and 900 K. By analysing these rotational
lines, we conclude that SiC2 is produced in the inner dust formation zone, with
an abundance of ~2x10^-7 relative to molecular hydrogen. These SiC2 lines have
been observed for the first time in space and have been used to derive an SiC2
rotational temperature of ~204 K and a source-averaged column density of
~6.4x10^15 cm^-2. Furthermore, the high quality of the HIFI data set was used
to improve the spectroscopic rotational constants of SiC2.Comment: A&A HIFI Special Issue, 201
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