The Pristine survey -- XXIII. Data Release 1 and an all-sky metallicity catalogue based on Gaia DR3 BP/RP spectro-photometry

Nicolas F. Martin, Else Starkenburg, Zhen Yuan, Morgan Fouesneau, Anke Ardern-Arentsen, Francesca De Angeli, Felipe Gran, Martin Montelius, Samuel Rusterucci, René Andrae, Michele Bellazzini, Paolo Montegriffo, Anna F. Esselink, Hanyuan Zhang, Kim A. Venn, Akshara Viswanathan, David S. Aguado, Giuseppina Battaglia, Manuel Bayer, Piercarlo BonifacioElisabetta Caffau, Patrick Côté, Raymond Carlberg, Sébastien Fabbro, Emma Fernández Alvar, Jonay I. González Hernández, Isaure González Rivera de La Vernhe, Vanessa Hill, Rodrigo A. Ibata, Pascale Jablonka, Georges Kordopatis, Carmela Lardo, Alan W. McConnachie, Camila Navarrete, Julio Navarro, Alejandra Recio-Blanco, Rubén Sánchez Janssen, Federico Sestito, Guillaume F. Thomas, Sara Vitali, Kristopher Youakim

Research output: Contribution to journalArticlepeer-review

Abstract

We used the spectro-photometric information of ~219 million stars from Gaia's DR3 to calculate synthetic, narrow-band, metallicity-sensitive CaHK magnitudes that mimic the observations of the Pristine survey, a survey of photometric metallicities of Milky Way (MW) stars that has been mapping >6,500 deg^2 of the northern sky with CFHT since 2015. These synthetic magnitudes were used for an absolute recalibration of the deeper Pristine photometry and, combined with broadband Gaia information, synthetic and Pristine CaHK magnitudes were used to estimate photometric metallicities over the whole sky. The resulting metallicity catalogue is accurate down to [Fe/H]~-3.5 and is particularly suited for the exploration of the metal-poor MW ([Fe/H] 16). Combined, both photometric metallicity catalogues include more than two million metal-poor star candidates ([Fe/H]_phot
Original languageEnglish
JournalAstronomy & Astrophysics
DOIs
Publication statusPublished - 2 Aug 2023

Keywords

  • astro-ph.GA

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