First Resolution of Microlensed Images of a Binary-lens Event

Autor: Zexuan Wu, Subo Dong, A. Mérand, Christopher S. Kochanek, Przemek Mróz, Jinyi Shangguan, Grant Christie, Thiam-Guan Tan, Thomas Bensby, Joss Bland-Hawthorn, Sven Buder, Frank Eisenhauer, Andrew P. Gould, Janez Kos, Tim Natusch, Sanjib Sharma, Andrzej Udalski, J. Woillez, David A. H. Buckley, I. B. Thompson, Karim Abd El Dayem, Anthony Berdeu, Jean-Philippe Berger, Guillaume Bourdarot, Wolfgang Brandner, Richard I. Davies, Denis Defrère, Catherine Dougados, Antonia Drescher, Andreas Eckart, Maximilian Fabricius, Helmut Feuchtgruber, Natascha M. Förster Schreiber, Paulo Garcia, Reinhard Genzel, Stefan Gillessen, Gernot Heißel, Sebastian Hönig, Mathis Houlle, Pierre Kervella, Laura Kreidberg, Sylvestre Lacour, Olivier Lai, Romain Laugier, Jean-Baptiste Le Bouquin, James Leftley, Bruno Lopez, Dieter Lutz, Felix Mang, Florentin Millour, Miguel Montargès, Hugo Nowacki, Mathias Nowak, Thomas Ott, Thibaut Paumard, Karine Perraut, Guy Perrin, Romain Petrov, Pierre-Olivier Petrucci, Nicolas Pourre, Sebastian Rabien, Diogo C. Ribeiro, Sylvie Robbe-Dubois, Matteo Sadun Bordoni, Daryl Santos, Jonas Sauter, Jules Scigliuto, Taro T. Shimizu, Christian Straubmeier, Eckhard Sturm, Matthias Subroweit, Calvin Sykes, Linda Tacconi, Frédéric Vincent, Felix Widmann, the GRAVITY+ collaboration

Publikováno v: The Astrophysical Journal, Vol 977, Iss 2, p 229 (2024)

We resolve the multiple images of the binary-lens microlensing event ASASSN-22av using the GRAVITY instrument of the Very Large Telescope Interferometer (VLTI). The light curves show weak binary-lens perturbations, complicating the analysis, but the

Externí odkaz: https://doaj.org/article/ec169c4efbcd4751ad64e77ba5835a2f

Mapping the Galactic centre’s dark cluster via resonant relaxation

Autor: Jean-Baptiste Fouvry, T. Paumard, Gernot Heißel, Frederic H. Vincent, Kerwann Tep, Guy Perrin, Christophe Pichon

Publikováno v: Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2021, 506 (3), pp.4289-4301. ⟨10.1093/mnras/stab1945⟩

Supermassive black holes in the centre of galaxies dominate the gravitational potential of their surrounding stellar clusters. In these dense environments, stars follow nearly Keplerian orbits, which get slowly distorted as a result of the potential

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49f238a991e9c8df72f54aeb638bba08
https://hal.archives-ouvertes.fr/hal-03372790

Isotropization of Slowly Expanding Spacetimes

Autor: Hamed Barzegar, Gernot Heißel, David Fajman

We show that the homogeneous, massless Einstein-Vlasov system with toroidal spatial topology and diagonal Bianchi type I symmetry for initial data close to isotropic data isotropizes towards the future and in particular asymptotes to a radiative Eins

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c06094d036cd1b9857ca99fa0049e6b3

Dynamics of locally rotationally symmetric Bianchi type VIII cosmologies with anisotropic matter

Autor: Gernot Heißel

Publikováno v: General Relativity and Gravitation. 44:2901-2922

This paper is a study of the effects of anisotropic matter sources on the qualitative evolution of spatially homogenous cosmologies of Bianchi type VIII. The analysis is based on a dynamical system approach and makes use of an anisotropic matter fami

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b4cc75b65138a30b8ec6b8561a11cc8
https://doi.org/10.1007/s10714-012-1430-8