Title: Study of high-redshift galaxies at Department of Astrophysics (DAP/VNSC)

Abstract:
The presentation covers research work done in the Department of Astrophysics of the Vietnam National Space Centre (DAP/VNSC) on high redshift galaxies in the early Universe. After a brief general introduction, including research interests and methods, in particular gravitational lensing, I will present radio interferometer studies using open-access ALMA observations of two quasar hosts, RX J0911.4+0551 and RX J1131, which illustrate well how the morpho-kinematics of their gas and dust components can be explored using millimetre continuum and line emissions. I will then turn to our present work, in collaboration with the Laboratoire d’Astrophysique de Marseille, in the frame of the MUSE Collaboration. MUSE stands for Multi Unit Spectroscopic Explorer and uses observations made by the Very Large Telescope (VLT) in the visible. It identifies and studies the first galaxies in the early Universe and their contribution to cosmic re-ionization. Finally, I will present results covering measurements of the Luminosity Function of ~600 Lyman-alpha Emitters probing down to 10^40 erg/s based on deep observations of 17 lensing clusters. This unique dataset will allow for placing strong constraints on the contribution of the LAE population to cosmic reionization.