Episodic star formation in a group of LAEs at z=5.07
Autor: | J. M. Mas-Hesse, N. Herrera Ruiz, A. Cabrera Lavers, N. Ramírez Olivencia, N. Castro Rodríguez, Antonio Cava, Omaira González-Martín, Nicolás Cardiel, A. Hernan Caballero, J. M. Rodríguez Espinosa, Jesús Gallego, Pablo G. Pérez-González, Casiana Muñoz-Tuñón |
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Rok vydání: | 2014 |
Předmět: |
Gran Telescopio Canarias
Physics Astrofísica Stellar mass 010308 nuclear & particles physics Star formation Astronomy Flux Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Galaxy Redshift Astronomía Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Alpha decay Spectroscopy 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
Zdroj: | E-Prints Complutense. Archivo Institucional de la UCM instname \mnras E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid |
Popis: | We are undertaking a search for high-redshift low-luminosity Lyman Alpha sources in the SHARDS (Survey for High-z Absorption Red and Dead Sources) survey. Among the pre-selected Lyman Alpha sources two candidates were spotted, located 3.19 arcsec apart, and tentatively at the same redshift. Here, we report on the spectroscopic confirmation with Gran Telescopio Canarias 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). |
Databáze: | OpenAIRE |
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