no code implementations • 23 Sep 2018 • Hector Olivares, Ziri Younsi, Christian M. Fromm, Mariafelicia De Laurentis, Oliver Porth, Yosuke Mizuno, Heino Falcke, Michael Kramer, Luciano Rezzolla
We find that the absence of an event horizon in a boson star leads to important differences in the dynamics of the accretion and results in both the formation of a small torus in the interior of the boson star and in the absence of an evacuated high-magnetization funnel in the polar regions.
General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena
no code implementations • 16 Apr 2018 • Yosuke Mizuno, Ziri Younsi, Christian M. Fromm, Oliver Porth, Mariafelicia De Laurentis, Hector Olivares, Heino Falcke, Michael Kramer, Luciano Rezzolla
Our Galactic Center, Sagittarius A* (Sgr A*), is believed to harbour a supermassive black hole (BH), as suggested by observations tracking individual orbiting stars.
Astrophysics of Galaxies High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology
no code implementations • 3 Aug 2017 • Freek Roelofs, Michael D. Johnson, Hotaka Shiokawa, Sheperd S. Doeleman, Heino Falcke
Turbulent evolution within the accretion disk is expected on timescales comparable to the orbital period, typically an order of magnitude larger than $t_G$.
High Energy Astrophysical Phenomena
2 code implementations • 16 Dec 2014 • Andrew P. V. Siemion, James Benford, Jin Cheng-Jin, Jayanth Chennamangalam, James Cordes, David R. DeBoer, Heino Falcke, Mike Garrett, Simon Garrington, Leonid Gurvits, Melvin Hoare, Eric J. Korpela, Joseph Lazio, David Messerschmitt, Ian S. Morrison, Tim O'Brien, Zsolt Paragi, Alan Penny, Laura Spitler, Jill Tarter, Dan Werthimer
The vast collecting area of the Square Kilometre Array (SKA), harnessed by sensitive receivers, flexible digital electronics and increased computational capacity, could permit the most sensitive and exhaustive search for technologically-produced radio emission from advanced extraterrestrial intelligence (SETI) ever performed.
Instrumentation and Methods for Astrophysics Earth and Planetary Astrophysics