Detailed Study of a Very Low Mass, Low Metallicity Starburst Galaxy at z=1.85
Abstract
We propose to carry out a detailed study of the ionizing spectrum and physical conditions in the gravitationally lensed arc SL2SJ021737-051329 at z=1.85, using rest-frame UV spectroscopy with LRIS. With stellar mass 10^8 Msun and metallicity Z 1/20 Zsun, SL2SJ0217 is one of the lowest metallicity star-forming galaxies yet identified at z>1. Due to its magnification by a factor of 35, this intrinsically faint object is amenable to detailed examination. Using the the combination of high S/N measurements of the rest-frame UV spectrum and rest-frame optical emission lines observed with the HST WFC3 grism, we will constrain the object's ionizing spectrum, confirm its low metallicity (so far determined indirectly), and study the Lya profile. High S/N in the rest-frame UV continuum will allow a sensitive test for galactic outflows in a very young starburst.
- Publication:
-
Keck Observatory Archive LRIS
- Pub Date:
- August 2015
- Bibcode:
- 2015koa..prop..524E