5,202 research outputs found
PolĂtica antiherĂ©tica en la Corona de AragĂłn: Una carta inĂ©dita de Inocencio III a la reina Sancha (1230)
This article studies the text and context of an unedited seventeenth century copy of the famous bull Vergentis in Senium of Pope Innocent III, which he sent in 1203, during the reign of Peter the Catholic, to Queen Sancha of Aragon, widow of Alfonso the Troubadour. The letter was sent in response to a petition for advice from Sancha as to how to proceed against heretics found in the crown of Aragon. These heretics were most probably Waldensians in High AragĂłn. This letter, sent as it was at a moment of great historical importance (on the eve of the coronation of Peter II in Rome) gives us new clues to the relationship between the Arago-Catalan monarchy and the papacy concerning the problem of heresy.This article studies the text and context of an unedited seventeenth century copy of the famous bull Vergentis in Senium of Pope Innocent III, which he sent in 1203, during the reign of Peter the Catholic, to Queen Sancha of Aragon, widow of Alfonso the Troubadour. The letter was sent in response to a petition for advice from Sancha as to how to proceed against heretics found in the crown of Aragon. These heretics were most probably Waldensians in High AragĂłn. This letter, sent as it was at a moment of great historical importance (on the eve of the coronation of Peter II in Rome) gives us new clues to the relationship between the Arago-Catalan monarchy and the papacy concerning the problem of heresy
Applications of the ACGT Master Ontology on Cancer
In this paper we present applications of the ACGT Master Ontology (MO) which is a new terminology resource for a transnational network providing data exchange in oncology, emphasizing the integration of both clinical and molecular data. The development of a new ontology was necessary due to problems with existing biomedical ontologies in oncology. The ACGT MO is a test case for the application of best practices in ontology development. This paper provides an overview of the application of the ontology within the ACGT project thus far
Pointwise Symmetrization Inequalities for Sobolev functions and applications
We develop a technique to obtain new symmetrization inequalities that provide
a unified framework to study Sobolev inequalities, concentration inequalities
and sharp integrability of solutions of elliptic equationsComment: made a number of corrections, added some reference
Parametrization of C-shocks. Evolution of the Sputtering of Grains
Context: The detection of narrow SiO lines toward the young shocks of the
L1448-mm outflow has been interpreted as a signature of the magnetic precursor
of C-shocks. In contrast with the low SiO abundances (<10E-12) in the ambient
gas, the narrow SiO emission at almost ambient velocities reveals enhanced SiO
abundances of 10E-11. This enhancement has been proposed to be produced by the
sputtering of the grain mantles at the first stages of C-shocks. However,
modelling of the sputtering of grains has usually averaged the SiO abundances
over the dissipation region of C-shocks, which cannot explain the recent
observations. Aims: To model the evolution of the gas phase abundances of SiO,
CH3OH and H2O, produced by the sputtering of grains as the shock propagates
through the ambient gas. Methods: We propose a parametric model to describe the
physical structure of C-shocks as a function of time. Using the known
sputtering yields for water mantles (with minor constituents like silicon and
CH3OH) and olivine cores by collisions with H2, He, C, O, Si, Fe and CO, we
follow the evolution of the abundances of silicon, CH3OH and H2O ejected from
grains. Results: The evolution of these abundances shows that CO seems to be
the most efficient sputtering agent in low velocity shocks. The velocity
threshold for the sputtering of silicon from the grain mantles is reduced by
5-10 km s-1 by CO compared to other models. The sputtering by CO can generate
SiO abundances of 10E-11 at the early stages of low velocity shocks, consistent
with those observed in the magnetic precursor of L1448-mm. Our model also
satisfactorily reproduce the progressive enhancement of SiO, CH3OH and H2O
observed in this outflow by the coexistence of two shocks with vs=30 and
60kms-1 within the same region.Comment: 12 pages, 7 figures, accepted for publication in A&
The heat kernel of the compactified D=11 supermembrane with non-trivial winding
We study the quantization of the regularized hamiltonian, , of the
compactified D=11 supermembrane with non-trivial winding. By showing that
is a relatively small perturbation of the bosonic hamiltonian, we construct a
Dyson series for the heat kernel of and prove its convergence in the
topology of the von Neumann-Schatten classes so that is ensured to be
of finite trace. The results provided have a natural interpretation in terms of
the quantum mechanical model associated to regularizations of compactified
supermembranes. In this direction, we discuss the validity of the Feynman path
integral description of the heat kernel for D=11 supermembranes and obtain a
matrix Feynman-Kac formula.Comment: 19 pages. AMS LaTeX. A whole new section was added and some other
minor changes in style where mad
X-ray emission from a brown dwarf in the Pleiades
We report the first detection of X-ray emission from a brown dwarf in the
Pleiades, the M7-type Roque 14, obtained using the EPIC detectors on
XMM-Newton. This is the first X-ray detection of a brown dwarf intermediate in
age between ~12 and ~320 Myr. The emission appears persistent, although we
cannot rule out flare-like behaviour with a decay time-scale > 4 ks. The
time-averaged X-ray luminosity of Lx = (3.3 +/- 0.8) x 10^{27} erg/s, and its
ratios with the bolometric (Lx/Lbol = 10^{-3.05}) and Halpha (Lx/LHa = 4.0)
luminosities suggest magnetic activity similar to that of active main-sequence
M dwarfs, such as the M7 old-disc star VB 8, though the suspected binary nature
of Roque 14 merits further attention. No emission is detected from four
proposed later-type Pleiades brown dwarfs, with upper limits to Lx in the range
2.1-3.8 x 10^{27} erg/s and to log(Lx/Lbol) in the range -3.10 to -2.91.Comment: 8 pages, 4 figures (6 eps files), accepted for publication in MNRAS,
Na I "emission" corrected to "absorption" in description of target
High angular resolution near-infrared integral field observations of young star cluster complexes in NGC1365
This paper presents and examines new near-infrared integral field
observations of the three so-called 'embedded star clusters' located in the
nuclear region of NGC1365. Adaptive-optics- corrected K-band data cubes were
obtained with the ESO/VLT instrument SINFONI. The continuum in the K-band and
emission lines such as HeI, Bracket-gamma, and several H2 lines were mapped at
an achieved angular resolution of 0.2arcsec over a field of 3x3arcsec^2 around
each source. We find that the continuum emission of the sources is spatially
resolved. This means that they are indeed cluster complexes confined to regions
of about 50pc extension. We performed robust measurements of the equivalent
width of the CO absorption band at 2.3micro and of Bracket-gamma. For the main
mid-infrared bright sources, the data only allow us to determine an upper limit
to the equivalent width of the CO bands. Under the assumption of an
instantaneously formed standard initial mass function Starburst99 model, the
new measurements are found to be incompatible with previously published
mid-infrared line ratios. We show that an upper mass limit of 25 to 30 solar
masses, lower than the typically assumed 100solar masses, allows one to simply
remove this inconsistency. For such a model, the measurements are consistent
with ages in the range of 5.5Myr to 6.5Myr, implying masses in the range from 3
to 10 x 10^6 solar masses. We detect extended gas emission both in HII and H2.
We argue that the central cluster complexes are the sources of excitation for
the whole nebulae, through ionisation and shock heating. We detect a blue wing
on the Bracket-gamma emission profile, suggesting the existence of gas outflows
centred on the cluster complexes. We do not find any evidence for the presence
of a lower mass cluster population, which would fill up a 'traditional' power
law cluster mass function.Comment: 15 pages, 10 figures, accepted for publication in A&
ISO observations of the Galactic center Interstellar Medium: neutral gas and dust
The 500 central pc of the Galaxy (hereafter GC) exhibit a widespread gas
component with a kinetic temperature of 100-200 K. The bulk of this gas is not
associated to the well-known thermal radio continuum or far infrared sources
like Sgr A or Sgr B. How this gas is heated has been a longstanding problem.
With the aim of studying the thermal balance of the neutral gas and dust in the
GC, we have observed 18 molecular clouds located at projected distances far
from thermal continuum sources with the Infrared Space Observatory (ISO). In
this paper we present observations of several fine structure lines and the full
continuum spectra of the dust between 40 and 190 microns. A warm dust component
with a temperature between 27 and 42 K is needed to fit the spectra. We have
compared the gas and the dust emission with the predictions from J-type and
C-type shocks and photodissociation region (PDRs) models. We conclude that the
dust and the fine structure lines observations are best explained by a PDR with
a density of 10 cm^-3 and an incident far-ultraviolet field 10 times
higher than the local interstellar radiation field. PDRs can naturally explain
the discrepancy between the gas and the dust temperatures. However, these PDRs
can only account for 10-30% of the total H2 column density with a temperature
of ~ 150 K. We discuss other possible heating mechanisms (short version).Comment: Accepted for publication by A&
Design strategies for optimizing holographic optical tweezers setups
We provide a detailed account of the construction of a system of holographic
optical tweezers. While much information is available on the design, alignment
and calibration of other optical trapping configurations, those based on
holography are relatively poorly described. Inclusion of a spatial light
modulator in the setup gives rise to particular design trade-offs and
constraints, and the system benefits from specific optimization strategies,
which we discuss.Comment: 16 pages, 15 figure
Extended X-ray Emission in the HI Cavity of NGC 4151: Galaxy-scale AGN Feedback?
We present the Chandra discovery of soft diffuse X-ray emission in NGC 4151
(L[0.5-2keV]~10^{39} erg s), extending ~2 kpc from the active nucleus
and filling in the cavity of the HI material. The best fit to the X-ray
spectrum requires either a kT~0.25 keV thermal plasma or a photoionized
component. In the thermal scenario, hot gas heated by the nuclear outflow would
be confined by the thermal pressure of the HI gas and the dynamic pressure of
inflowing neutral material in the galactic disk. In the case of
photoionization, the nucleus must have experienced an Eddington limit outburst.
For both scenarios, the AGN-host interaction in NGC 4151 must have occured
relatively recently (some 10^4 yr ago). This very short timescale to the last
episode of high activity phase may imply such outbursts occupy 1% of
AGN lifetime.Comment: 6 pages, 3 figures, accepted for publication in the ApJ Letter
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