Investigating Normal Star-forming Galaxies At Z ~1

Open Access
Author:
Cui, Can
Area of Honors:
Astronomy and Astrophysics
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Robin Bruce Ciardullo, Thesis Supervisor
  • Jane Camilla Charlton, Honors Advisor
Keywords:
  • galaxy evolution
  • galaxy formation
Abstract:
We use the 3D-HST visible and near-IR grism survey to study the star formation rate (SFR), stellar mass and extinction with normal star-forming galaxies selected in the GOODS-South region in the redshift ranges 0.68<z<0.82 and 1.2<z<1.4 . These spectra include the emission lines of Hα, Hβ, [O III] 5007, and [O II] 3727. For our sample, we find the correlation between nebular extinction derived from balmer decrement and stellar extinction from SED fitting agrees with the z ~ 0 universe, which has an empirically correlation that the extinction for nebular lines is ~ 2 times that found from the star light. Some of our sample contain high [O III]/Hβ ratios which we think could be due to high energy photons emitted from AGN, shocks from winds, or hot stars.