Spectroscopic Determination of White Dwarf Candidates for the Dark Energy Survey

Mees Bernard Fix

Abstract


The Dark Energy Survey (DES) is a current project in Fermilab's Cosmic Frontier, which is a 5000-square- degree optical/near infrared imaging survey conducted over 5 years (2013-2018) for purposes of measuring the properties of dark energy. Synthetic photometry of pure-hydrogen-atmosphere ("DA") white dwarfs is currently the preferred technique for absolute zero point calibration of large sky surveys. For absolute calibration of the DES a "Golden Sample" of 30-100 DA white dwarfs needs to be developed. The starting point is a photometric and spectroscopic observational campaign of approximately 1000 candidate white dwarfs in the DES field. Analyzing imaging and spectroscopic data will allow us to narrow down this sample. About 37 percent of the candidates are DA white dwarfs.


Keywords


Dark energy, White Dwarf, Spectroscopy

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