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dc.contributor.advisorLy, Chun
dc.contributor.authorLeimbach, Reagen
dc.creatorLeimbach, Reagen
dc.date.accessioned2021-02-03T04:42:04Z
dc.date.available2021-02-03T04:42:04Z
dc.date.issued2020-05
dc.identifier.citationLeimbach, Reagen. (2020). RECALIBRATING STRONG-LINE METALLICITY DIAGNOSTICS WITH ELECTRON TEMPERATURE MEASUREMENTS FROM COMPOSITE SPECTRA OF STAR-FORMING GALAXIES (Bachelor's thesis, University of Arizona, Tucson, USA).
dc.identifier.urihttp://hdl.handle.net/10150/651369
dc.description.abstractGalaxy evolution is driven by the accretion of gas, the birth of stars, and the outflows of enriched gas from dying stars. We can understand how these processes behave with heavy element abundance measurements. Current studies of distant galaxies utilize “strong-line diagnostics” to determine these abundances. These measurements are not accurate as they are calibrated with nearby galaxies, which differ from galaxies seen in the early universe. One method for solving this problem is to calibrate these commonly used strong-line diagnostics for distant galaxies with a “direct” metallicity indicator that is sensitive to the electron temperature, [Oiii]λ4363. In my Honors thesis project, I analyzed data from the DEEP2 Survey with the goal of detecting this emission line. I explored different binning approaches to find the best technique to obtain optimal signal-to-noise for stacked spectra. Ultimately, I yielded seven detections and eight reliable limiting cases of [Oiii]λ4363 out of twenty-seven composite spectra. Using these measurements, I evaluated two recently published calibrations for high-redshift galaxies. Ifind that one calibration developed byJiang et al. [2019] yielded more reliable estimates with a difference on the “R23” flux ratio of 0.03 dex with a dispersion of 0.07 dex. However, the calibration was not robust for low and high metallicities. Given these limitations, I plan to develop my own calibration that encompasses the broad range of metallicities seen for high-redshift galaxies.
dc.language.isoen
dc.publisherThe University of Arizona.
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleRECALIBRATING STRONG-LINE METALLICITY DIAGNOSTICS WITH ELECTRON TEMPERATURE MEASUREMENTS FROM COMPOSITE SPECTRA OF STAR-FORMING GALAXIES
dc.typeElectronic Thesis
dc.typetext
thesis.degree.grantorUniversity of Arizona
thesis.degree.levelbachelors
thesis.degree.disciplineAstronomy
thesis.degree.disciplineHonors College
thesis.degree.nameB.S.
refterms.dateFOA2021-02-03T04:42:04Z


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