Interacting LAEs at z = 5.1. Episodic star formation in a group of LAEs
  at z= 5.07
  We are undertaking a search for high-redshift low luminosity Lyman Alpha
sources in the SHARDS survey. Among the pre-selected Lyman Alpha sources 2
candidates were spotted, located 3.19 arcsec apart, and tentatively at the same
redshift. Here we report on the spectroscopic confirmation with GTC of the
Lyman Alpha emission from this pair of galaxies at a confirmed spectroscopic
redshifts of z=5.07. Furthermore, one of the sources is interacting/merging
with another close companion that looks distorted. Based on the analysis of the
spectroscopy and additional photometric data, we infer that most of the stellar
mass of these objects was assembled in a burst of star formation 100 Myr ago. A
more recent burst (2 Myr old) is necessary to account for the measured Lyman
Alpha flux. We claim that these two galaxies are good examples of Lyman Alpha
sources undergoing episodic star formation. Besides, these sources very likely
constitute a group of interacting Lyman Alpha emitters (LAEs).
