Magnetic White Dwarf Stars in the Sloan Digital Sky Survey
S. O. Kepler, Ingrid Pelisoli, Stefan Jordan, Scot J. Kleinman,, Baybars Kulebi, Detlev Koester, Viviane Pe\c{c}anha, B\'arbara G., Castanheira, Atsuko Nitta, Jos\'e Eduardo da Silveira Costa, Don Earl Winget,, Antonio Kanaan, and Luciano Fraga

TL;DR
This study analyzed SDSS spectra of hydrogen atmosphere white dwarfs to identify magnetic fields via Zeeman splitting, discovering 521 magnetic white dwarfs with fields up to 733 MG, constituting 4% of observed DAs.
Contribution
First large-scale survey of magnetic fields in SDSS white dwarfs, providing statistical insights into magnetic white dwarf occurrence and detection reliability.
Findings
521 magnetic white dwarfs identified
Magnetic fields range from 1 MG to 733 MG
Magnetic white dwarfs constitute 4% of DAs
Abstract
To obtain a better statistics on the occurrence of magnetism among white dwarfs, we searched the spectra of the hydrogen atmosphere white dwarf stars (DAs) in the Data Release 7 of the Sloan Digital Sky Survey (SDSS) for Zeeman splittings and estimated the magnetic fields. We found 521 DAs with detectable Zeeman splittings, with fields in the range from around 1 MG to 733 MG, which amounts to 4% of all DAs observed. As the SDSS spectra have low signal-to-noise ratios, we carefully investigated by simulations with theoretical spectra how reliable our detection of magnetic field was.
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