Department of Astronomy & Physics

A study of Lyman Alpha Emitters in high-redshift protoclusters

Speaker: Dr. Nicola Malavasi (Purdue University)
Time: March 16, 2018 - 3:00 PM
Location: Atrium 101


Lyman Alpha Emitters (LAEs) are a class of galaxies that show a particularly bright Lyman Alpha emission line in their spectrum with respect to the UV continuum. This feature makes it possible to easily identify them at high-redshift, by means of matched narrow- and broad-band surveys. The study of the number of LAEs as a function of redshift, their luminosity, mass, star-formation rate, and other properties offers the possibility to gather information on the galaxy population at z ~ 3-4.
As LAEs are relatively easy to identify at high-redshift, the discovery of overdensities of such objects often leads to the identification of protocluster structures in the young Universe, at a time when structure formation was in full development. The study of the properties of LAEs in relation to their environment can therefore help to characterize the progenitors of nowadays galaxy clusters and allows us to understand at what redshift the environmental effects on galaxy evolution observed today began to appear.
In this talk I present results obtained investigating the characteristics of LAEs in two high-redshift protoclusters at redshifts z ~ 3.790 and z ~ 2.698. From the study of the Lyman Alpha luminosity and Equivalent Width functions, to their spatial distribution with respect to known overdensities and other galaxy types, to the case study of a particularly large and bright LAE in our sample, investigating these peculiar sources can provide us with a unique way of obtaining a picture of the typical properties of low-mass star-forming galaxies in the distant Universe.


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