78 research outputs found
The GL bibliography and an interactive database
It is now possible to directly access, via the Internet, a bibliographical
database on Gravitational Lensing (GL) literature. The Interactive
Gravitational Lensing Bibliography (IGLB) totalizes more than 2400 titles of
published articles in scientific journals and meeting proceedings (except those
fully dedicated to Gravitational Lenses) as well as papers submitted to the
e-Print archive. This database is a product from the Gravitational Lensing
Bibliography first presented in 1993 (Proceedings of the 31st Liege
International Astrophysical Colloquium). It is easy to do field based searches
for title keywords, authors (using boolean operators), year and journal (a
pull-down list of the most cited journals is available). Access to the original
version of published articles as well as to preprints submitted to the e-Print
archive at the URL address http://xxx.lanl.gov/ is also provided. This database
is updated approximately every two months. The "complete" bibliography of
published articles is also available in the form of Latex and PostScript files.
The IGLB can be accessed at the URL: http://vela.astro.ulg.ac.be/grav_lensComment: 2 pages, 2 figures, uses paspconf.sty. Poster contribution to
"Gravitational Lensing: Recent Progress and Future Goals", Boston University
1999, eds. T. G. Brainerd and C. S. Kochane
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A fool's marathon
"A Fool's Marathon" is a fabulist novel exploring themes of Platonic love, imagination and its relationship to reality, and psychological coming of age through the exploits of a young Oscar Duplenty. The work-in-progress is presented in two sections: the first a contiguous five chapters from the beginning of the newest draft, and the second a selection of passages from a previous edition. These selections elucidate the book's major themes, describe its characters' motivating concerns, and exhibit a variety of possible styles for the finished work. This excerpt from "A Fool's Marathon" is presented both as a work of fiction and as a study of work in fiction, designed to help us understand the relationship between our lived experience and the narratives we inherit and construct
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Music for strings
In this collection of linked stories, four characters navigate space between selves they’ve been and those to come. Alice must invent an autonomous identity after her husband dies in a bike crash. As she casts about to populate a new life, a geographer, a violinist, and a clarinetist emerge at similar crossroads. Each character locates a measure of solace in music: strings and woodwinds, the rail of bathwater and rain, a storm’s quiet end
A Change in the Lightcurve of Kuiper Belt Contact Binary (139775) 2001 QG298
New observations show that the lightcurve of Kuiper belt contact binary
(139775) 2001 QG298 has changed substantially since the first observations in
2003. The 2010 lightcurve has a peak-to-peak photometric of range
\Deltam{2010}=0.7\pm0.1 mag, significantly lower than in 2003,
\Deltam{2003}=1.14\pm0.04 mag. This change is most simply interpreted if 2001
QG298 has an obliquity near 90 deg. The observed decrease in \Deltam is caused
by a change in viewing geometry, from equator-on in 2003 to nearly 16 deg (the
orbital angular distance covered by the object between the observations) off
the equator in 2010. The 2003 and 2010 lightcurves have the same rotation
period and appear in phase when shifted by an integer number of full rotations,
also consistent with high obliquity. Based on the new 2010 lightcurve data, we
find that 2001 QG298 has an obliquity {\epsilon}=90\pm30 deg. Current estimates
of the intrinsic fraction of contact binaries in the Kuiper belt are debiased
assuming that these objects have randomly oriented spins. If, as 2001 QG298,
KBO contact binaries tend to have large obliquities, a larger correction is
required. As a result, the abundance of contact binaries may be larger than
previously believed.Comment: 28 pages, 10 figures, 5 tables. Accepted for publication in The
Astronomical Journal (2011 July 18
Photometry, pole orientation and shape parameters of the minor planets 624 Hektor and 43 Ariadne
The XMM-LSS Survey: A well controlled X-ray cluster sample over the D1 CFHTLS area
We present the XMM-LSS cluster catalogue corresponding to the CFHTLS D1 area.
The list contains 13 spectroscopically confirmed, X-ray selected galaxy
clusters over 0.8 deg2 to a redshift of unity and so constitutes the highest
density sample of clusters to date. Cluster X-ray bolometric luminosities range
from 0.03 to 5x10^{44} erg/s. In this study, we describe our catalogue
construction procedure: from the detection of X-ray cluster candidates to the
compilation of a spectroscopically confirmed cluster sample with an explicit
selection function. The procedure further provides basic X-ray products such as
cluster temperature, flux and luminosity. We detected slightly more clusters
with a (0.5-2.0 keV) X-ray fluxes of >2x10^{-14} erg/s/cm^{-2} than we expected
based on expectations from deep ROSAT surveys. We also present the
Luminosity-Temperature relation for our 9 brightest objects possessing a
reliable temperature determination. The slope is in good agreement with the
local relation, yet compatible with a luminosity enhancement for the 0.15 < z<
0.35 objects having 1 < T < 2 keV, a population that the XMM-LSS is identifying
systematically for the first time. The present study permits the compilation of
cluster samples from XMM images whose selection biases are understood. This
allows, in addition to studies of large-scale structure, the systematic
investigation of cluster scaling law evolution, especially for low mass X-ray
groups which constitute the bulk of our observed cluster population. All
cluster ancillary data (images, profiles, spectra) are made available in
electronic form via the XMM-LSS cluster database.Comment: 12 pages 5 figures, MNRAS accepted. The paper with full resolution
cluster images is available at
http://vela.astro.ulg.ac.be/themes/spatial/xmm/LSS/rel_pub_e.htm
The XMM-LSS catalogue: X-ray sources and associated optical data. Version I
Following the presentation of the XMM-LSS X-ray source detection package by
Pacaud et al., we provide the source lists for the first 5.5 surveyed square
degrees. The catalogues pertain to the [0.5-2] and [2-10] keV bands and contain
in total 3385 point-like or extended sources above a detection likelihood of 15
in either band. The agreement with deep logN-logS is excellent. The main
parameters considered are position, countrate, source extent with associated
likelihood values. A set of additional quantities such as astrometric
corrections and fluxes are further calculated while errors on the position and
countrate are deduced from simulations. We describe the construction of the
band-merged catalogue allowing rapid sub-sample selection and easy
cross-correlation with external multi-wavelength catalogues. A small optical
CFHTLS multi-band subset of objects is associated wich each source along with
an X-ray/optical overlay. We make the full X-ray images available in FITS
format. The data are available at CDS and, in a more extended form, at the
Milan XMM-LSS database.Comment: 13 pages, 7 figures and 11 tables (fig. 1 and 6 are enclosed in
reduced resolution), MNRAS Latex, accepted by MNRA
The XMM-LSS survey. Survey design and first results
We have designed a medium deep large area X-ray survey with XMM - the XMM
Large Scale Structure survey, XMM-LSS - with the scope of extending the
cosmological tests attempted using ROSAT cluster samples to two redshift bins
between 0<z<1 while maintaining the precision of earlier studies. Two main
goals have constrained the survey design: the evolutionary study of the
cluster-cluster correlation function and of the cluster number density. The
results are promising and, so far, in accordance with our predictions as to the
survey sensitivity and cluster number density. The feasibility of the programme
is demonstrated and further X-ray coverage is awaited in order to proceed with
a truly significant statistical analysis. (Abridged)Comment: Published in Journal of Cosmology and Astroparticle Physic
The XMM-LSS survey: the Class 1 cluster sample over the initial 5 square degrees and its cosmological modelling
We present a sample of 29 galaxy clusters from the XMM-LSS survey over an
area of some 5deg2 out to a redshift of z=1.05. The sample clusters, which
represent about half of the X-ray clusters identified in the region, follow
well defined X-ray selection criteria and are all spectroscopically confirmed.
For all clusters, we provide X-ray luminosities and temperatures as well as
masses. The cluster distribution peaks around z=0.3 and T =1.5 keV, half of the
objects being groups with a temperature below 2 keV. Our L-T(z) relation points
toward self-similar evolution, but does not exclude other physically plausible
models. Assuming that cluster scaling laws follow self-similar evolution, our
number density estimates up to z=1 are compatible with the predictions of the
concordance cosmology and with the findings of previous ROSAT surveys. Our well
monitored selection function allowed us to demonstrate that the inclusion of
selection effects is essential for the correct determination of the evolution
of the L-T relation, which may explain the contradictory results from previous
studies. Extensive simulations show that extending the survey area to 10deg2
has the potential to exclude the non-evolution hypothesis, but that constraints
on more refined ICM models will probably be limited by the large intrinsic
dispersion of the L-T relation. We further demonstrate that increasing the
dispersion in the scaling laws increases the number of detectable clusters,
hence generating further degeneracy [in addition to sigma8, Omega_m, L(M,z) and
T(M,z)] in the cosmological interpretation of the cluster number counts. We
provide useful empirical formulae for the cluster mass-flux and mass-count-rate
relations as well as a comparison between the XMM-LSS mass sensitivity and that
of forthcoming SZ surveys.Comment: Accepted for publication by MNRAS. Full resolution images as well as
additional cluster data are available through a dedicated database at
http://l3sdb.in2p3.fr:8080/l3sdb
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