Long-term IR Photometry of Seyferts

Long-term (up to 10000d) monitoring has been undertaken for 41 Seyferts in the near-IR (JHKL). All but 2 showed variability, with K ampl in the range <0.1 to > 1.1 mags. The timescale for detectable change is from about one week to a few years. A simple cross-correlation study shows evidence for delays of up to several hundred days between the variations seen at the shortest wavelengths and the longest in many galaxies. In particular, the data for F9 now extend to twice the interval covered earlier and the delay between its UV and IR outputs persists. An analysis of the fluxes shows that, for any given galaxy, the colours of the variable component are usually independent of the level of activity. The state of activity can be parameterized. Taken over the whole sample, the colours of the variable components fall within moderately narrowly defined ranges. In particular, the H-K colour is appropriate to a black body of temperature 1600K. The H-K excess for a heavily reddened nucleus can be determined and used to find E_{B-V}, which can be compared to the values found from the visible region broad line fluxes. Using flux-flux diagrams, the flux within the aperture from the underlying galaxy can often be determined without the need for model surface brightness profiles. In many galaxies it is apparent that here must be an additional constant contribution from warm dust.Comment: Better quality available from ftp://ftp.saao.ac.za/pub/isg/seyf.pd

On Israel-Wilson-Perjes black holes

We show, under certain conditions, that regular Israel-Wilson-Perj\'es black holes necessarily belong to the Majumdar-Papapetrou family

All-sky Galactic radiation at 45 MHz and spectral index between 45 and 408 MHz

Aims: We study the Galactic large-scale synchrotron emission by generating a reliable all-sky spectral index map and temperature map at 45 MHz. Methods: We use our observations, the published all-sky map at 408 MHz, and a bibliographical compilation to produce a map corrected for zero-level offset and extragalactic contribution. Results: We present full sky maps of the Galactic emission at 45 MHz and the Galactic spectral index between 45 and 408 MHz with an angular resolution of 5\degs. The spectral index varies between 2.1 and 2.7, reaching values below 2.5 at low latitude because of thermal free-free absorption and its maximum in the zone next to the Northern Spur.Comment: A&A accepte

Self-similar extinction for a diffusive Hamilton-Jacobi equation with critical absorption

International audienceThe behavior near the extinction time is identified for non-negative solutions to the diffusive Hamilton-Jacobi equation with critical gradient absorption ∂_t u − ∆_p u + |∇u|^{p−1} = 0 in (0, ∞) × R^N , and fast diffusion 2N/(N + 1) < p < 2. Given a non-negative and radially symmetric initial condition with a non-increasing profile which decays sufficiently fast as |x| → ∞, it is shown that the corresponding solution u to the above equation approaches a uniquely determined separate variable solution of the form U (t, x) = (T_e − t)^{1/(2−p)} f_* (|x|), (t, x) ∈ (0, T_e) × R^N , as t → T_e , where T_e denotes the finite extinction time of u. A cornerstone of the convergence proof is an underlying variational structure of the equation. Also, the selected profile f_* is the unique non-negative solution to a second order ordinary differential equation which decays exponentially at infinity. A complete classification of solutions to this equation is provided, thereby describing all separate variable solutions of the original equation. One important difficulty in the uniqueness proof is that no monotonicity argument seems to be available and it is overcome by the construction of an appropriate Pohozaev functional

Peat bogs in northern Alberta, Canada reveal decades of declining atmospheric Pb contamination

Peat cores were collected from six bogs in northern Alberta to reconstruct changes in the atmospheric deposition of Pb, a valuable tracer of human activities. In each profile, the maximum Pb enrichment is found well below the surface. Radiometric age dating using three independent approaches (14C measurements of plant macrofossils combined with the atmospheric bomb pulse curve, plus 210Pb confirmed using the fallout radionuclides 137Cs and 241Am) showed that Pb contamination has been in decline for decades. Today, the surface layers of these bogs are comparable in composition to the "cleanest" peat samples ever found in the Northern Hemisphere, from a Swiss bog ~ 6000 to 9000years old. The lack of contemporary Pb contamination in the Alberta bogs is testimony to successful international efforts of the past decades to reduce anthropogenic emissions of this potentially toxic metal to the atmosphere

Leishmania species identification by PCR-RFLP analysis and its applications in FrenchGuiana

International audienceLeishmania (Viannia) guyanensis was for many years the only species commonly identified in French Guiana, but precise species identifications were quite rare. We describe a new RFLP-PCR technique using a 615 bp fragment of the RNA polymerase II gene and two restriction enzymes, TspR1 and Hga1. Seven reference strains (L.(L)amazonensis, L.(V)lainsoni, L.(V)braziliensis, L.(V)guyanensis, L.(V)naiffi, L.(L)major / L.(L)infantum) and 112 clinical samples from positive lesions were used for the development of the technique. The rates of positive species identification were 85.7% for punch skin biopsy specimens, 93.1% for positive Giemsa-stained smears and 100% for positive culture supernatants. In the framework of cutaneous leismaniasis species surveillance for the 2006-2008 period, parasite identification was carried out for 199 samples from different patients. The prevalence of the various Leishmania species was 84.4% for L.(V)guyanensis, 8.0% for L.(V)braziliensis, 5.0% for L.(V)amazonensis and 2.6% for L.(V)lainsoni. L.(V)braziliensis seems to be locally an emerging pathogen

Les évolutions de la reconnaissance des (in)capacités juridiques : une comparaison France-Québec

International audienceLes travaux comparatifs sur les enjeux de santé et de protection sociale ont développé des modèles concernant l’organisation sociopolitique de l’État social, prenant en compte notamment le coût des prises en charge des personnes vulnérables. Peu se sont en revanche intéressés à la place des droits civils et politiques dans la comparaison.Au-delà de l’augmentation du nombre de mesures de contraintes légales dans de nombreux pays occidentaux, la reconnaissance des (in)capacités juridiques soulève la question des répercussions que peuvent produire des situations de handicap, de dépendance ou de maladie sur l’exercice par les personnes vulnérables de leurs droits. Elle révèle plus largement les tensions concrètes produites par la coexistence d’idéaux difficiles à articuler, comme ceux d’autonomie et de protection ou de solidarité et de liberté.Cet article entend comparer de manière sociohistorique l’évolution des modes de reconnaissance des (in)capacités juridiques en France et au Québec. Il éclaire la place prise par des acteurs et savoirs « experts » dans l’évaluation clinique des (in)capacités ainsi que celle d’experts internationaux des droits humains en dégageant les éléments saillants de trois modes de reconnaissance des (in)capacités. Il met en perspective les articulations et tensions contemporaines entre le souci clinique pour les personnes vulnérabilisées et celui du respect de leurs droits