The Pristine survey

We used the spectro-photometric information of ∼219 million stars from Gaia ’s Data Release 3 (DR3) to calculate synthetic, narrowband, metallicity-sensitive CaHK magnitudes that mimic the observations of the Pristine survey, a survey of photometric metallicities of Milky Way stars that has been mapping more than 6500 deg 2 of the northern sky with the Canada–France–Hawaii Telescope 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 metalpoor Milky Way ([Fe/H] < −1.0). We make available here the catalogue of synthetic CaHK syn magnitudes for all stars with BP/RP information in Gaia DR3, as well as an associated catalogue of more than ∼30 million photometric metallicities for high signal-to-noise FGK stars. This paper further provides the first public data release of the Pristine catalogue in the form of higher quality recalibrated Pristine CaHK magnitudes and photometric metallicities for all stars in common with the BP/RP spectro-photometric information in Gaia DR3. We demonstrate that, when available, the much deeper Pristine data greatly enhance the quality of the derived metallicities, in particular at the faint end of the catalogue ( G BP ≳ 16). Combined, both photometric metallicity catalogues include more than two million metal-poor star candidates ([Fe/H] phot < −1.0) as well as more than 200 000 and ∼8000 very and extremely metal-poor candidates ([Fe/H] phot < −2.0 and < −3.0, respectively). Finally, we show that these metallicity catalogues can be used efficiently, among other applications, for Galactic archaeology, to hunt for the most metal-poor stars, and to study how the structure of the Milky Way varies with metallicity, from the flat distribution of disk stars to the spheroid-shaped metal-poor halo.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-10-02
DOI
https://doi.org/10.1051/0004-6361/202347633
Citations
34
Primary Topic
Astronomical Observations and Instrumentation
Type
article
Field-Weighted Citation Impact
12.75

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article

The Pristine survey

P. Montegriffo, R. Andrae, Anna F. Esselink, G. Kordopatis et al.
34 citations
Astronomy and Astrophysics
Astronomical Observations and Instrumentation
12.75
article

The Pristine survey

P. Montegriffo, R. Andrae, Anna F. Esselink, G. Kordopatis, Julio F. Navarro, Federico Sestito, E. Caffau, V. Hill, Kim A. Venn, M. Fouesneau, Alan W. McConnachie, S. Fabbro, Else Starkenburg, A. Recio–Blanco, Patrick Côté, Rodrigo Ibata, Sara Vitali, M. Bellazzini, P. Bonifacio, David S. Aguado, C. Lardo, G. Battaglia, Akshara Viswanathan, F. De Angeli, F. Gran, R. G. Carlberg, Zhen Yuan, Emma Fernández-Alvar, Guillaume F. Thomas, Martin Montelius, J. I. Gónzalez Hernández, Camila Navarrete, Anke Arentsen, Nicolas F. Martin, P. Jablonka, Isaure González Rivera de La Vernhe, Samuel Rusterucci, Hanyuan Zhang, Rubén Sánchez-Janssen, Manuel Bayer, Kristopher Youakim
article en
34 citations

Abstract

We used the spectro-photometric information of ∼219 million stars from Gaia ’s Data Release 3 (DR3) to calculate synthetic, narrowband, metallicity-sensitive CaHK magnitudes that mimic the observations of the Pristine survey, a survey of photometric metallicities of Milky Way stars that has been mapping more than 6500 deg 2 of the northern sky with the Canada–France–Hawaii Telescope 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 metalpoor Milky Way ([Fe/H] < −1.0). We make available here the catalogue of synthetic CaHK syn magnitudes for all stars with BP/RP information in Gaia DR3, as well as an associated catalogue of more than ∼30 million photometric metallicities for high signal-to-noise FGK stars. This paper further provides the first public data release of the Pristine catalogue in the form of higher quality recalibrated Pristine CaHK magnitudes and photometric metallicities for all stars in common with the BP/RP spectro-photometric information in Gaia DR3. We demonstrate that, when available, the much deeper Pristine data greatly enhance the quality of the derived metallicities, in particular at the faint end of the catalogue ( G BP ≳ 16). Combined, both photometric metallicity catalogues include more than two million metal-poor star candidates ([Fe/H] phot < −1.0) as well as more than 200 000 and ∼8000 very and extremely metal-poor candidates ([Fe/H] phot < −2.0 and < −3.0, respectively). Finally, we show that these metallicity catalogues can be used efficiently, among other applications, for Galactic archaeology, to hunt for the most metal-poor stars, and to study how the structure of the Milky Way varies with metallicity, from the flat distribution of disk stars to the spheroid-shaped metal-poor halo.

Astronomy and AstrophysicsVol. 692
Herzberg Institute of Astrophysics (CA), Centre National de la Recherche Scientifique (FR), Universidad de La Laguna (ES), Stockholm University (SE), University of Groningen (NL), University of Toronto (CA), Université Côte d'Azur (FR), University of Victoria (CA), University of Cambridge (GB), Université Paris Sciences et Lettres (FR), Observatoire de Paris (FR), Observatoire astronomique de Strasbourg (FR), Galaxies, Etoiles, Physique et Instrumentation (FR), Royal Observatory (GB), Max Planck Institute for Astronomy (DE), Observatoire de la Côte d’Azur (FR), Instituto de Astrofísica de Canarias (ES), AlbaNova (SE), Osservatorio di Astrofisica e Scienza dello Spazio, UK Astronomy Technology Centre (GB), École Polytechnique Fédérale de Lausanne (CH), Université de Strasbourg (FR), Universidad Diego Portales (CL), University of Bologna (IT)
Science and Technology Facilities Council
No poverty
Openalex Percentile: Top 0%
Astronomical Observations and Instrumentation
12.75
DOIOpen Access PDFOpenAlex
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