HETDEX Pilot Survey. VI. [OIII] Emitters and Expectations for a Local Sample of Star Forming Galaxies in HETDEX
Briana Indahl, Greg Zeimann, Gary J. Hill, Steven L. Finkelstein,, Robin Ciardullo, Joanna S. Bridge, Taylor Chonis, Niv Drory, Caryl Gronwall,, Hanshin Lee, Kristen McQuinn

TL;DR
This study uses unbiased spectroscopic data from HETDEX to identify local star-forming galaxies, revealing a broader diversity in metallicity and star formation rates than photometric surveys, and predicting future large-scale findings.
Contribution
It demonstrates the effectiveness of spectroscopic selection in uncovering diverse star-forming galaxies missed by photometric methods, informing expectations for future HETDEX results.
Findings
Most galaxies follow the SDSS mass-metallicity relation.
Discovery of low-metallicity galaxies similar to green peas.
Star formation rates are intermediate between SDSS and green pea galaxies.
Abstract
We assemble an unbiased sample of 29 galaxies with [O II] and/or [O III] detections at from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Pilot Survey (HPS). HPS finds galaxies without pre-selection based on their detected emission lines via integral field spectroscopy. Sixteen of these objects were followed up with the second-generation, low resolution spectrograph (LRS2) on the upgraded Hobby-Eberly Telescope. Oxygen abundances were then derived via strong emission lines using a Bayesian approach. We find most of the galaxies fall along the mass-metallicity relation derived from photometrically selected star forming galaxies in the Sloan Digital Sky Survey (SDSS). However, two of these galaxies have low metallicity (similar to the very rare green pea galaxies in mass-metallicity space). The star formation rates of this sample fall…
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