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Activity Number: 28 - Computation, Design, and Quality Assurance of Physical Science and Engineering Applications
Type: Contributed
Date/Time: Sunday, August 8, 2021 : 1:30 PM to 3:20 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract #318891
Title: Determining the Accuracy and Precision of DEEP2 Spectroscopic and Photometric Galaxy Redshift Measurements Using a Measurement Error Model
Author(s): Richard Anthony Bilonick*
Companies: R. A. Bilonick Statistics Consultancy LLC
Keywords: Redshift; Astronomy; Measurement Error Model; Structural Equation Model; Bias; Imprecision

Spectroscopy has long been used to measure the redshift of galaxies and is considered to be accurate and precise but can be difficult for faint galaxies. Photometric redshift measurements depend on flux measurements at different wavelengths of light which are easier to make but less accurate and less precise. Studies using one or more photometric measurements typically include a single spectroscopic measurement for comparison. Photometric methods differ in how color is analyzed but all depend on the same wavelength information. Constructing a measurement error model (MEM) for a set of only photometric methods is relatively trivial. Including spectroscopic measurements requires a more complicated model that accounts for the correlation among the photometric methods induced by the common light information. Including both spectroscopic and photometric measurements required two different sets of galaxies from DEEP2. Set A included one spectroscopic measurement and 6 photometric methods for 1432 galaxies. Set B included replicated spectroscopic measurements on 1540 galaxies. A linked multi-factor MEM was used and quantitatively and comprehensibly characterized the methods.

Authors who are presenting talks have a * after their name.

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