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See detailLens environment spectroscopy and update on Mass-Sheet and Source-Position Transformations
Sluse, Dominique ULg; Schneider, Peter; Unruh, Sandra et al

Scientific conference (2015, April 27)

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See detailLens galaxies in the Illustris simulation: power-law models and the bias of the Hubble constant from time delays
Xu, Dandan; Sluse, Dominique ULg; Schneider, Peter et al

in Monthly Notices of the Royal Astronomical Society (2016), 456

A power-law density model, i.e. ρ (r) ∝ r^{-γ ^' }}, has been commonly employed in strong gravitational lensing studies, including the so-called time-delay technique used to infer the Hubble constant H ... [more ▼]

A power-law density model, i.e. ρ (r) ∝ r^{-γ ^' }}, has been commonly employed in strong gravitational lensing studies, including the so-called time-delay technique used to infer the Hubble constant H[SUB]0[/SUB]. However, since the radial scale at which strong lensing features are formed corresponds to the transition from the dominance of baryonic matter to dark matter, there is no known reason why galaxies should follow a power law in density. The assumption of a power law artificially breaks the mass-sheet degeneracy, a well-known invariance transformation in gravitational lensing which affects the product of Hubble constant and time delay and can therefore cause a bias in the determination of H[SUB]0[/SUB] from the time-delay technique. In this paper, we use the Illustris hydrodynamical simulations to estimate the amplitude of this bias, and to understand how it is related to observational properties of galaxies. Investigating a large sample of Illustris galaxies that have velocity dispersion σ[SUB]SIE[/SUB] ≥ 160 km s[SUP]-1[/SUP] at redshifts below z = 1, we find that the bias on H[SUB]0[/SUB] introduced by the power-law assumption can reach 20-50 per cent, with a scatter of 10-30 per cent (rms). However, we find that by selecting galaxies with an inferred power-law model slope close to isothermal, it is possible to reduce the bias on H[SUB]0[/SUB] to ≲ 5 per cent and the scatter to ≲ 10 per cent. This could potentially be used to form less biased statistical samples for H[SUB]0[/SUB] measurements in the upcoming large survey era. [less ▲]

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See detailLensed quasars: a matter of resolution
Courbin, F.; Lidman, C.; Burud, I. et al

in The Messenger (2000), 101

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See detailLensing degeneracies
Sluse, Dominique ULg

Conference (2014, April)

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See detailLensing properties of 7 damped Lyalpha absorbing galaxy-QSO pairs
Le Brun, V.; Smette, A.; Surdej, Jean ULg et al

in Astronomy and Astrophysics (2000), 363

Le Brun et al. (1997) presented the first identifications of the galaxies giving rise to 7 intermediate redshift damped Lyalpha (DLA) absorption systems. Here, we study the gravitational lensing ... [more ▼]

Le Brun et al. (1997) presented the first identifications of the galaxies giving rise to 7 intermediate redshift damped Lyalpha (DLA) absorption systems. Here, we study the gravitational lensing properties of these foreground galaxies based on their observed optical appearance and on the absence of any secondary lensed quasar image. We consider the possibility that any secondary image be hidden due to extinction by dust, but find it unlikely. We derive upper limits on the amplification factor affecting the luminosity of the background quasars; in each case, this factor is found to be less than 0.3 mag. We also obtain upper limits on the total mass of the damped Ly-alpha galaxies, within radii equal to the quasar impact parameters. Mass-to-light ratios are found to be consistent with existing estimates based on X-ray emission or on motion of dwarf satellites. Although we show that lensing is not important in this sample, we note that existing DLA surveys used to determine the cosmological density of gas at z < 1 are based on samples of quasars brighter than the ones considered here and for which the amplification bias is likely to be stronger. [less ▲]

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See detail'Een lent van vaerzen' als letterkundig spiegelkabinet
Steyaert, Kris ULg

in Arabesken: Tijdschrift van het Louis Couperus Genootschap (2015), 23(45), 22-28

Detailed reference viewed: 15 (3 ULg)
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See detailLentilles gravitationnelles, Cours No 1: Astrophysique et Techniques Spatiales: Ingés aéro/ Ingés Phys 2011-2012 (Fichier PDF + vidéos: mov, m4v)
Surdej, Jean ULg

Learning material (2011)

Introduction à la théorie des lentilles gravitationnelles (1ère partie)

Detailed reference viewed: 527 (85 ULg)
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See detailLentilles gravitationnelles, Cours No 2: Astrophysique et Techniques Spatiales: Ingés aéro/ Ingés Phys 2011-2012 (Fichier PDF + vidéos: mov, avi, m4v)
Surdej, Jean ULg

Learning material (2011)

Introduction à la théorie des lentilles gravitationnelles (2ème partie)

Detailed reference viewed: 254 (49 ULg)
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See detailLentilles gravitationnelles, Cours No 3: Astrophysique et Techniques Spatiales: Ingés aéro/Ingés Phys 2011-2012 (Fichiers pdf + vidéos: mov, avi, m4v)
Surdej, Jean ULg

Learning material (2011)

Introduction à la théorie des lentilles gravitationnelles (3ème partie)

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See detailLentogenic strains of Newcastle disease virus in pigeons.
Vindevogel, Henri ULg; Thiry, Etienne ULg; Pastoret, Paul-Pierre ULg et al

in Veterinary Record : Journal of the British Veterinary Association (1982), 110(21), 497-9

Detailed reference viewed: 40 (0 ULg)
See detailLENZ : La loi de Lenz : séquence d'enseignement assisté par ordinateur
Hardy, Jean-Luc; Ackermans, Albert; Gruselin, Claude et al

Learning material (1982)

Detailed reference viewed: 84 (3 ULg)
See detailLeodico. Introduction aux Actes du colloque de numismatique organisé à l’Université de Liège
George, Philippe ULg

in Cahiers de l’Institut Archéologique Liégeois, t. V, 2002, p. 5. (2000)

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See detailLEODIUM project and student space activities at the University of Liege
Vandenrijt, Jean-François ULg; Rochus, Pierre ULg; Kerschen, Gaëtan ULg et al

Conference (2007)

the origin of the LEODIUM project which stands for Low Earth Orbit Demonstration of Innovations in University Mode. This project aims to create student pico- or nano-satellites. There is a strong ... [more ▼]

the origin of the LEODIUM project which stands for Low Earth Orbit Demonstration of Innovations in University Mode. This project aims to create student pico- or nano-satellites. There is a strong motivation coming from the students and from the academic members to promote space. Being unexperienced in complete satellite design, as a first step in this direction, we started working with the ESA funded SSETI association. At the moment, two teams of students are working on SSETI satellites. One is working as the MECH team which is in charge of the design of the sun-pointing solar panels of the European Student Earth Orbiter (ESEO) satellite mechanisms, the other team is working on the phase-A studies of the Narrow Angle Camera (NAC) which will be the core payload of the European Student Moon Orbiter (ESMO) satellite, both in collaboration with local industrials. The students are mainly working on ESEO and ESMO as part of their master thesis. In addition to that, two PhD students are in charge of the coordination of the teams (one for the ESEO team and another for the ESMO team). They will also be the link between previous and new students every times an overlap will occur and ensure that information is not lost during the transition. In this paper, we will describe the current design and the achievements on the ESEO solar panels and the ESMO NAC camera. Explanation will also be given on how the collaboration between the local student and the SSETI association is managed. Finally, we will briefly introduce the prospective for the LEODIUM project. [less ▲]

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See detailLéon Bloy et la communication. Dans l'enfer des médias
Durand, Pascal ULg

in Série Léon Bloy (2001), 5

Detailed reference viewed: 33 (4 ULg)
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See detailLéon d’Oultres
Marchandisse, Alain ULg

in Lecocq, Isabelle (Ed.) Les vitraux de la cathédrale Saint-Paul à Liège (2016)

Detailed reference viewed: 17 (0 ULg)
See detailLéon Degrelle comme référence des droites radicales allemandes après 1945
Brüll, Christoph ULg

in Dard, Olivier (Ed.) Références et thèmes des droites radicales au XXe siècle (Europe/Amériques) (2014)

The Belgian fascist Léon Degrelle claimed easily being Hitler’s spiritual heir in the post-war, a role which became obvious at the end of the 1970’s when he was the last of the great War collaborators ... [more ▼]

The Belgian fascist Léon Degrelle claimed easily being Hitler’s spiritual heir in the post-war, a role which became obvious at the end of the 1970’s when he was the last of the great War collaborators still alive. On the fringes of the political spectrum Degrelle’s personality was still fascinating. This was also the case in Germany where – like an absent chief – he was used as a reference by right-wing movements from various tendencies – from the, expected, reference for the veterans of the Waffen-SS to reference for neo-nazi movements at the turn of the 1970-1980s. Finally, he was also a reference for the Europeanization of the right-wing extremism which considered him as a “watchkeeper” for the West. After a brief return to the period before 1945, this contribution is searching for traces of what Degrelle could be for German right-wing extremists and furnishing a first analysis through some key moments covering chronological and thematic segments from the 1950s to Degrelle’s death in 1994. It studies a little known dimension of Belgian-German relations, an European discourse which was of course anticommunist and antiliberal but was using as mean of action facts of the past which had constantly to be legitimized and brought back to life. [less ▲]

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See detailLéon Degrelle, der Rexismus und die Kriegskollaboration im französischsprachigen Belgien
Brüll, Christoph ULg

Scientific conference (2011, May 25)

Detailed reference viewed: 43 (3 ULg)
See detailLéon Pety de Thozée (1882-1908)
Bechet, Christophe ULg

in Raxhon, Philippe (Ed.) Les Gouverneurs de la Province de Liège. Histoire d'une fonction, mémoire d'une action. (2015)

Detailed reference viewed: 22 (1 ULg)
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See detailLeon Sloman, « Role of attachment and social rank systems in three levels of adaptation: Clinical implications »
Englebert, Jérôme ULg; Follet, Valérie

in Englebert, Jérôme; Follet, Valérie (Eds.) Adaptation : Essai collectif à partir des paradigmes éthologiques et évolutionnistes (2016)

Detailed reference viewed: 30 (4 ULg)
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See detailLéon Wuidar ou les hiérophanies ludiques
Housen, Jean ULg

E-print/Working paper (2011)

Présentation de l'oeuvre de Léon Wuidar (sculptures au Musée en plein air du Sart-Tilman).

Detailed reference viewed: 44 (6 ULg)