Доклад: Coupling local to global star formation in spiral galaxies: the effect of differential rotation
Charles Aouad
The talk is about the relation between the kinematics of the galaxy on a global scale, in particular the way it rotates ie: differential rotation, on the star formation capacity and therefore its evolution. Authors apply in their study principles of fluid mechanics on the rotating disk. The talk will start by introducing the conundrum of star formation, and how it is still an unresolved problem in astrophysics, the ultimate search for a star formation theory if such a theory exists and the difference between small scale and large scale approaches and the many attempts to connect between them. Then the concept of differential rotation and its physical effect on fluids (shear and vorticity) will be introduced. After this Charles will talk about the findings of our study (data,method, results and theory).
https://arxiv.org/abs/2003.02848
Alberto Rodríguez-Ardila, Marcos Antonio Fonseca-Faria
Published 2020-06-03, 5 pages, 2 figures. To appear in Proceedings of IAU Symposium 359 (T. Storchi-Bergmann, R. Overzier, W. Forman & R. Riffel, eds.)
We employ optical spectroscopy from the Multi Unit Spectroscopic Explorer(MUSE) combined with X-ray and radio data to study the highly-ionized gas (HIG)phase of the feedback in a sample of five local nearby Active Galactic Nuclei(AGN). Thanks to the superb field of view and sensitivity of MUSE, we foundthat the HIG, traced by the coronal line [FeVII] $\lambda$6089, extends toscales not seen before, from 700 pc in Circinus and up to ~2 kpc in NGC5728 andNGC3393. The gas morphology is complex, following closely the radio jet and theX-ray emission. Emission line ratios suggest gas excitation by shocks producedby the passage of the radio jet. This scenario is further supported by thephysical conditions derived for the HIG, stressing the importance of themechanical feedback in AGN with low-power radio jets.
Published 2020-05-29, Submitted to Experimental Astronomy, 16 pages, comments are welcome
We described the design and operation principles of a new tunable-filterphotometer developed for the 1-m telescope of the Special AstrophysicalObservatory of the Russian Academy of Sciences and the 2.5-m telescope of theSternberg Astronomical Institute of the Moscow State University. The instrumentis mounted on the scanning Fabry-Perot interferometer operating in thetunable-filter mode in the spectral range of 460-800 nm with a typical spectralresolution of about 1.5 nm. It allows one to create images of galactic andextragalactic nebulae in the emission lines having different excitationconditions and to carry out diagnostics of the gas ionization state. The mainsteps of observations, data calibration, and reduction are illustrated byexamples of different emission-line objects: galactic HII regions, planetarynebulae, active galaxies with extended filaments, starburst galaxies, andPerseus galaxy cluster.