1,050 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
Redshift estimate of a gravitational lens from the observed reddening of a multiply imaged quasar
Light rays from a multiply imaged quasar usually sample different path
lengths across the deflector. Extinction in the lensing galaxy may thus lead to
a differential obscuration and reddening between the observed macro-lensed QSO
images. These effects naturally depend on the precise shape of the extinction
law and on the redshift of the lens. By means of numerical Monte-Carlo
simulations, using a least-squares fitting method and assuming an extinction
law similar to that observed in the Galaxy, we show how accurate photometric
observations of multiply imaged quasars obtained in several spectral bands
could lead to the estimate of the lens redshift, irrespective of the visibility
of the deflector. Observational requirements necessary to apply this method to
real cases are thoroughly discussed. If extinction laws turn out to be too
different from galaxy to galaxy, we find out that more promising observations
should consist in getting high signal-to-noise low resolution spectra of at
least three distinct images of a lensed quasar, over a spectral range as wide
as possible, from which it should be straightforward to extract the precise
shape of the redshifted extinction law. Very high signal-to-noise, low spectral
resolution, VLT observations of H1413+117 and MG 0414+0534 should enable one to
derive such a redshifted extinction law.Comment: 7 pages, 11 figures, to appear in Astronomy and Astrophysics (also
available at http://vela.astro.ulg.ac.be/preprint/
Succession planning in Polish family business. An exploratory investigation (chapter 4)
The main aim of the paper is to identify the succession strategies (especially the ways in which they attempt to balance the strive to maintain family’s control over the company with the goal of firm’s growth) of the first generation of Polish entrepreneurs. Research survey was conducted on a random sample of 496 family enterprises in first quarter of 2009 (first phase, survey) and 61 family enterprises in third quarter of 2009 (second phase, in-depth-interview). Research project “Succession Scenarios in First Generation of Polish Entrepreneurs” was conducted in the years 2008-2010 by Aleksander Surdej and Krzysztof Wach was financed by Polish Ministry of Science and Higher Education (Project no. 1326/B/H03/2008/34).family firms, succession, Poland, family entrepreneurship
Search for gravitational lens candidates in the XMM-LSS/CFHTLS common field
Our aim was to identify gravitational lens candidates among some 5500 optical
counterparts of the X-ray point-like sources in the medium-deep ~11 sq. deg.
XMM-LSS survey. We have visually inspected the optical counterparts of each
QSOs/AGN using CFHTLS T006 images. We have selected compact pairs and groups of
sources which could be multiply imaged QSO/AGN. We have measured the colors and
characterized the morphological types of the selected sources using the
multiple PSF fitting technique. We found three good gravitational lens
candidates: J021511.4-034306, J022234.3-031616 and J022607.0-040301 which
consist of pairs of point-like sources having similar colors. On the basis of a
color-color diagram and X-ray properties we could verify that all these sources
are good QSO/AGN candidates rather than stars. Additional secondary
gravitational lens candidates are also reported.Comment: 6 pages, 3 figures, 1 table, Accepted for publication in MNRA
Succession scenarios in Polish family firms. Empirical Study (Chapter 8)
The paper elaborates on succession planning among Polish family businesses. Research survey was conducted on a random sample of 496 family enterprises in first quarter of 2009 (first phase, survey) and 61 family enterprises in third quarter of 2009 (second phase, in-depth-interview). The main aim of the paper is to identify the succession strategies (especially the ways in which they attempt to balance the strive to maintain family’s control over the company with the goal of firm’s growth) of the first generation of Polish entrepreneurs.family businesses, family entrepreneurship, succession planning
A non exhaustive bibliography on gravitational lensing
The authors present a non exhaustive bibliography on "gravitational lensing", totalizing more than 1000 titles. Books (related to) and conference proceedings fully devoted to "gravitational lensing" are listed separately
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