Research Center for Astronomy


Wednesday 20 July 2022, 13:00


Star Formation Quenching in L* Ellipticals

Suraj Dhiwar
Inter-University Centre for Astronomy and Astrophysics, Pune, India


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Featured Picture


Gaflows in  barred galaxies with big orbital loops  

The gas response in a barred galaxy model, in which the orbital backbone of the bar, i.e. the orbits of the x1 family, have big loops close to the end of the bar, shows sevaral interesting features. In a recent study   (Pastras, Patsis, Athanassoula 2022)  we found that he dust-lane shocks in the gas responses of barred galaxies models avoid the regions in which the stable POs of the x1 family have developed sufficiently big loops. They deviate from these regions and, as they bypass them, they form extensions at an angle with the straight-line shocks. Ahead of them, in the direction of rotation, we find low-density regions, which in many cases have a “triangular”-like shape. We reach this conclusion by means of two conceptually different hydrodynamic schemes for our calculations, namely, the mesh-free Lagrangian SPH method and the adaptive mesh refinement code RAMSES. This allows us to compare responses by means of the two algorithms. 

 In the frame above, we present a typical snapshot of our RAMSES simulation, summarizing the main morphological features, together with the velocity vectors indicating the flow. The flow vectors are colored yellow, when they are in regions below the minimum density we considered. The two long white arrows indicate the point where the tails of the Γ features join the dust-lane shocks in the bar region. The stellar response is given in the background using a red color for the test particles. Red dots give the locations of the Lagrangian points.


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It is with deep sorrow that we inform you about the passing of our colleague and collaborator in RCAAM projects, Evangelos Chaliasos, last December.

Evangelos was born in Domianous Evritanias, Greece, on the 28th of December, 1947. He received his B.Sc. in Mathematics (1971) and in Physics (1979) from the University of Athens, Greece. He obtained a M.Sc. in Astronomy from the University of Chicago, U.S.A. (1988) and his Ph.D. from the University of Athens. His scientific interest was in relativistic Astrophysics.

New publication in Greek.

Latest Developments in Astronomy 2021: Research Results from the Research Center for Astronomy and Applied Mathematics of the Academy of Athens.

The Annual Report of our Center for 2021 is available in Greek  

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