Unveiling the Nature of the “Green Pea” Galaxies
We review recent results on the oxygen and nitrogen chemical abundances in extremely compact, low-mass starburst galaxies at redshifts between 0.1 and 0.3 recently named to as “Green Pea” galaxies. These galaxies are genuine metal-poor galaxies (∼ one fifth solar in median) with N/O ratios unusually high for galaxies of the same metallicity. In combination with their known general properties, i.e., size, stellar mass and star-formation rate, these findings suggest that these objects could be experiencing a short and extreme phase in their evolution. The possible action of both recent and massive inflow of gas, as well as stellar feedback mechanisms are discussed here as main drivers of the starburst activity and their oxygen and nitrogen abundances.
KeywordsStar Formation Stellar Mass Star Formation Rate Oxygen Abundance Starburst Galaxy
We are very grateful to Polychronis Papaderos, Gerhard Hensler, and Simone Recchi for valuable comments on this manuscript. This work has been funded by grants AYA2007-67965-C03-02, and CSD2006-00070: First Science with the GTC (http://www.iac.es/consolider-ingenio-gtc/) of the Consolider-Ingenio 2010 Program, by the Spanish MICINN.
- 27.Amorín, R.O., Pérez-Montero, E., Vílchez, J.M., Papaderos, P. ApJ, in press (arXiv:1202. 3419)Google Scholar