A<i>Gaia</i>Data Release 2 catalogue of white dwarfs and a comparison with SDSS
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No Canadian affiliation. An affiliation-only frame — the usual design — would never have seen this work. It is one of the works that make the case for inverting the frame.
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- Teacher spread
- 0.207 · how far apart the two teachers sit on this one work
- Validation status
score_only:v0-immature-baseline· verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it
Abstract
We present a catalogue of white dwarf candidates selected from the second data release of Gaia (DR2). We used a sample of spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey (SDSS) to map the entire space spanned by these objects in the Gaia Hertzsprung–Russell diagram. We then defined a set of cuts in absolute magnitude, colour, and a number of Gaia quality flags to remove the majority of contaminating objects. Finally, we adopt a method analogous to the one presented in our earlier SDSS photometric catalogues to calculate a probability of being a white dwarf (PWD) for all Gaia sources that passed the initial selection. The final catalogue is composed of 486641 stars with calculated PWD from which it is possible to select a sample of ≃260000 high-confidence white dwarf candidates in the magnitude range 8 < G < 21. By comparing this catalogue with a sample of SDSS white dwarf candidates, we estimate an upper limit in completeness of 85 per cent for white dwarfs with G ≤ 20 mag and Teff >7000 K, at high Galactic latitudes (|b| > 20°). However, the completeness drops at low Galactic latitudes, and the magnitude limit of the catalogue varies significantly across the sky as a function of Gaia’s scanning law. We also provide the list of objects within our sample with available SDSS spectroscopy. We use this spectroscopic sample to characterize the observed structure of the white dwarf distribution in the H–R diagram.
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The record
- Venue
- Monthly Notices of the Royal Astronomical Society
- Topic
- Stellar, planetary, and galactic studies
- Field
- Physics and Astronomy
- Canadian institutions
- —
- Funders
- Planetary Science DivisionHorizon 2020Science Mission DirectorateScience and Technology Facilities CouncilGordon and Betty Moore FoundationEuropean Research CouncilQueen's University BelfastSeventh Framework ProgrammeSmithsonian Astrophysical ObservatoryNederlandse Organisatie voor Wetenschappelijk OnderzoekQueen's UniversityDeutsche ForschungsgemeinschaftEötvös Loránd TudományegyetemSmithsonian InstitutionU.S. Department of EnergyEuropean CommissionOffice of ScienceLos Alamos National LaboratoryEuropean Space AgencyAlfred P. Sloan FoundationJohns Hopkins UniversitySpace Telescope Science InstituteDurham UniversityNational Science FoundationNational Aeronautics and Space AdministrationNational Central University
- Keywords
- PhysicsWhite dwarfAstrophysicsAstronomyMassive compact halo objectBrown dwarfStars
- Has abstract in OpenAlex
- yes