Research Center for Astronomy

Events

Tuesday 29 May 2018 @ 12:00

Magnetically driven jets from astrophysical black holes (Part II)

Ioannis Contopoulos
Research Center for Astronomy and Applied Mathematics of the Academy of Athens


read more...

Subscribe to our weekly seminars mailing list

* indicates required




 

Featured Picture

 

The picture shows the applicability of the manifold theory of spiral arms in N-body simulations of barred-spiral galaxies. The red and blue points visualize the `apocentric' unstable manifolds emanating from periodic orbits in the neighborhood of the bar's Lagrangian points L1 and L2. These manifolds support `chaotic spirals' (Patsis 2006) in the form of outflows from the region of L1 or L2. The dark contour lines produce the image of the disc in the N-body simulation using the Sobel-Feldman edge detection algorithm for recognizing spiral or ring patterns in the disc. According to the manifold theory, the complexity of these patterns is related to the complexity of the `homoclinic lobes' formed by the invariant manifolds. The simulation was performed using a new N-body code based on a Cartesian grid solver of Poisson's equation using fast pre-conditioning techniques (Kyziropoulos et al. 2016, 2017). The invariant manifold theory is one of the main current theories for modeling spirals beyond the ends of bars (see Dobbs & Baba 2014). It has been developed in two versions: the `apocentric' manifolds (Voglis et al 2006) and the `flux tube manifolds' (Romero-Gomez et al. 2006, 2007), see Athanassoula (2012) and Efthymiopoulos (2010) for reviews and further references.

References:

View previous Featured Pictures here...


The Annual Report of our Center for 2017 is available in Greek and English.


New publication in Greek.

Latest Developments in Astronomy 2017: Research Results from the Research Center for Astronomy and Applied Mathematics of the Academy of Athens.


About Us | Site Map | Privacy Policy | Contact Us | ©2010-12 Research Center for Astronomy of the Academy of Athens