The role of HI distribution and kinematics on the escape of Lya photons in star-forming galaxies (Lucia Guaita; INAF-Osservatorio astronomico di Roma & ESO Santiago)

From April 26, 2017 13:15 until April 26, 2017 13:45

At Instituto de Astrofísica, Pontificia Universidad Católica, Vicuña Mackenna 4860, Santiago, Chile

Categories: Seminarios

Lyman alpha (Lya) emitters (LAEs) provide our best opportunity to study low-mass galaxies experiencing active phases of star formation. Lya photons are scattered by HI atoms and therefore LAEs could be used as tracers of the HI distribution and kinematics. Insights in the propagation and escape of Lya photons can be obtained studying local star-bursts. However, LAEs have been detected at any redshift and their properties are not homogeneous. We selected a sample of 2 < z < 4 LAEs from the VUDS (VIMOS Ultra Deep Survey) survey and I will present how scattering and HI kinematics, such as star-formation outflows, can affect the escape and large-scale propagation of Lya photons. This can have implications for the LAE evolution and also for the understanding of the galaxy properties at the epoch of re-ionization.