FM22.2.03 — GLASS: spatially resolved spectroscopy of lensed galaxies in the Frontier Fields

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Aug 3rd at 2:40 PM until 3:00 PM

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Author(s): Tucker Jones2, Tommaso Treu3, Gabriel Brammer1, Kasper Borello Schmidt2, Matthew A Malkan3

Institution(s): 1. STScI, 2. UC Santa Barbara, 3. UCLA

The Grism Lens-Amplified Survey from Space (GLASS) has obtained slitless near-IR spectroscopy of 10 galaxy clusters selected for their strong lensing properties, including all six Hubble Frontier Fields. Slitless grism spectra are ideal for mapping emission lines such as [O II], [O III], and H alpha at z=1-3. The combination of strong gravitational lensing and HST's diffraction limit provides excellent sensitivity with spatial resolution as fine as 100 pc for highly magnified sources, and ~500 pc for less magnified sources near the edge of the field of view. The GLASS survey represents the largest spectroscopic sample with such high resolution at z>1. GLASS and Hubble Frontier Field data provide the distribution of stellar mass, star formation, gas-phase metallicity, and other aspects of the physical structure of high redshift galaxies, reaching unprecedented stellar masses as low as ~10^7 Msun​ at z=2. I will discuss precise measurements of these physical properties and implications for galaxy evolution.