1,485 research outputs found
Photometric Monitoring of the Gravitationally Lensed Ultraluminous BAL Quasar APM08279+5255
We report on one year of photometric monitoring of the ultraluminous BAL
quasar APM 08279+5255. The temporal sampling reveals that this gravitationally
lensed system has brightened by ~0.2 mag in 100 days. Two potential causes
present themselves; either the variability is intrinsic to the quasar, or it is
the result of microlensing by stars in a foreground system. The data is
consistent with both hypotheses and further monitoring is required before
either case can be conclusively confirmed. We demonstrate, however, that
gravitational microlensing can not play a dominant role in explaining the
phenomenal properties exhibited by APM 08279+5255. The identification of
intrinsic variability, coupled with the simple gravitational lensing
configuration, would suggest that APM 08279+5255 is a potential golden lens
from which the cosmological parameters can be derived and is worthy of a
monitoring program at high spatial resolution.Comment: 17 pages, with 2 figures. Accepted for publication in P.A.S.
Effect of a Single Bout of Prior Moderate Exercise on Cutaneous Perfusion in Type 2 Diabetes
In diabetic individuals, increased shunting of circulation away from the skin may exist, contributing to their greater risk for ulcerations and poor cutaneous healing. In a prospective study (1), we previously found a lower skin perfusion during local heating in the foot dorsum of sedentary type 2 diabetic individuals compared with active people without diabetes. This defect was present despite normal increases in skin interstitial nitric oxide (NO), suggesting that NO is either ineffective or not involved (2). A prior bout of maximal exercise also lessened the impaired responsiveness to local heating of the dorsal foot in active type 2 diabetic individuals but not in their sedentary counterparts (3). Thus, this study examined the effect of a single bout of prior moderate cycle exercise on dorsal foot cutaneous perfusion and interstitial NO
Cutaneous Blood Flow in Type 2 Diabetic Individuals After an Acute Bout of Maximal Exercise
OBJECTIVE - We previously demonstrated a positive association between chronic aerobic exercise and dorsal foot skin blood flow during local heating in type 2 diabetic individuals. Thus, we hypothesized that a prior acute bout of maximal exercise would also have positive effects on postexercise blood now. RESEARCH DESIGN AND METHODS - Subjects consisted of 32 individuals with type 2 diabetes and 26 nondiabetic control subjects further subdivided based on their physical activity status diabetic exerciser (DE), diabetic sedentary (DS), control exerciser (CE), or control sedentary. Dorsal foot cutaneous blood flow was measured noninvasively by continuous laser-Doppler assessment at baseline and during local heating to 44°C before and after a maximal bout of cycle exercise. Interstitial nitric oxide (NO) levels were measured concurrently in the foot dorsum. RESULTS - increases in blood flow and its responsiveness to local heating to 44°C were significantly lower in both diabetic groups compared with CE before maximal exercise, but perfusion responsiveness remained lower in DS subjects only after exercise (P \u3c 0.05). Baseline skin blood flow was not different among groups preexercise, but it was significantly increased postexercise in DE subjects only. Interstitial NO levels were not significantly different at either time. At baseline, groups differed only in HbA1c, fasting serum glucose, HDL cholesterol, and insulin resistance (homeostasis model assessment method). CONCLUSIONS - All diabetic individuals exhibit a blunted responsiveness of cutaneous blood flow with local heating to 44°C before maximal exercise compared with active nondiabetic individuals, but after an exercise bout, it remains significantly blunted only in diabetic individuals who are sedentary. These findings occur independently of changes in interstitial NO levels
A consistent truncation of IIB supergravity on manifolds admitting a Sasaki-Einstein structure
We present a consistent truncation of IIB supergravity on manifolds admitting
a Sasaki-Einstein structure, which keeps the metric and five real scalar
fields. This theory can be further truncated to a constrained one-parameter
family that depends on only the metric and one scalar, as well as to a theory
with a metric and three scalars. The reduced theory admits supersymmetric and
non-supersymmetric AdS_5 and AdS_4 x R solutions. We analyze the spectrum
around the AdS critical points and identify the dual operators.Comment: 21 pages; v2: references added and minor improvement
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder III. Line Identification and Off-Axis Spectra
The ESA Herschel Spectral and Photometric Imaging Receiver (SPIRE) Fourier
Transform Spectrometer (FTS) Spectral Feature Finder (FF) project is an
automated spectral feature fitting routine developed within the SPIRE
instrument team to extract all prominent spectral features from all publicly
available SPIRE FTS observations. We present the extension of the FF to include
the off-axis detectors of the FTS in sparsely sampled single-pointing
observations, the results of which have been ingested into the catalogue. We
also present the results from an automated routine for identifications of the
atomic/molecular transitions that correspond to the spectral features extracted
by the FF. We use a template of 307 atomic fine structure and molecular lines
that are commonly found in SPIRE FTS spectra for the cross-match. The routine
makes use of information provided by the line identification to search for low
signal-to-noise ratio features that have been excluded or missed by the
iterative FF. In total, the atomic/molecular transitions of 178,942 lines are
identified (corresponding to 83% of the entire FF catalogue), and an additional
33,840 spectral lines associated with missing features from SPIRE FTS
observations are added to the FF catalogue.Comment: 15 pages (+2 appendix pages), 14 figures, 7 tables, final version
accepted by MNRAS June 202
Algebraic description of spacetime foam
A mathematical formalism for treating spacetime topology as a quantum
observable is provided. We describe spacetime foam entirely in algebraic terms.
To implement the correspondence principle we express the classical spacetime
manifold of general relativity and the commutative coordinates of its events by
means of appropriate limit constructions.Comment: 34 pages, LaTeX2e, the section concerning classical spacetimes in the
limit essentially correcte
Survival of a submarine canyon during long-term outbuilding of a continental margin
Net-depositional submarine canyons are common in continental slope strata, but how they survive and prograde on constructional margins is poorly understood. In this study we present field evidence for the coevolution of a submarine canyon and the adjacent continental slope. Using a three-dimensional seismic data cube that images the Ebro margin (northwest Mediterranean), we identify a preserved canyon on a middle Pleistocene paleosurface and relate it directly to its expression on the present-day seafloor. A subparallel stacking pattern of seismic reflectors, similar to that seen between prograding clinoforms in intercanyon areas, is observed between the modern and paleocanyon thalwegs. The concavity of the modern long profile differs from the convex-concave long profile on the middle Pleistocene surface, suggesting a long-term change in canyon sedimentation. We interpret this change as a shift to a canyon dominated by turbidity currents from one strongly influenced by the pattern of sedimentation that built the open-slope canyon interfluves. We find support for our interpretation in previous studies of the Ebro margin
- …