The ESA Gaia Archive: Data Release 1

Salgado, J.; González-Núñez, J.; Gutiérrez–Sánchez, R.; Segovia, J. C.; Durán, J.; Hernández, J.; Arviset, C.

doi:10.1016/j.ascom.2017.08.002

Cited by 36 publications

(32 citation statements)

References 15 publications

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“…All scenarios received by March 2012 were considered and analysed, and presented in the DPAC Gaia data access scenarios scoping document GAIA-C9-TN-LEI-AB-026 9 . The Gaia ESA Archive (Salgado et al 2016) was designed to take into account these user requirements.…”

Section: A1 Testing Methodologymentioning

confidence: 99%

GaiaData Release 1

Arenou

Luri

Babusiaux

et al. 2017

A&A

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Context. Before the publication of the Gaia Catalogue, the contents of the first data release have undergone multiple dedicated validation tests. Aims. These tests aim to provide in-depth analysis of the Catalogue content in order to detect anomalies and individual problems in specific objects or in overall statistical properties, and either to filter them before the public release or to describe the different caveats on the release for an optimal exploitation of the data. Methods. Dedicated methods using either Gaia internal data, external catalogues, or models have been developed for the validation processes. They test normal stars as well as various populations such as open or globular clusters, double stars, variable stars, and quasars. Properties of coverage, accuracy, and precision of the data are provided by the numerous tests presented here and are jointly analysed to assess the data release content. Results. This independent validation confirms the quality of the published data, Gaia DR1 being the most precise all-sky astrometric and photometric catalogue to date. However, several limitations in terms of completeness, and astrometric or photometric quality are identified and described. Figures describing the relevant properties of the release are shown, and the testing activities carried out validating the user interfaces are also described. A particular emphasis is made on the statistical use of the data in scientific exploitation.

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Section: A1 Testing Methodologymentioning

confidence: 99%

GaiaData Release 1

Arenou

Luri

Babusiaux

et al. 2017

A&A

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“…Secondly (described in Sect. 3.3), we validated the candidates querying data through the Gaia archive facility at ESAC (Salgado et al 2017) with pygacs 3 to extract the positions (α, δ, l, b), parallaxes ( ), proper motions (µ α * , µ δ ), fluxes in the G, G BP and G RP passbands, and their associated uncertainties and covariances, from the table gaiadr2.gaia_source via ADQL (Ortiz et al 2008) queries launched using the TAP protocol (Dowler et al 2018).…”

Section: Datamentioning

confidence: 99%

Gaia DR2 unravels incompleteness of nearby cluster population: new open clusters in the direction of Perseus

Cantat-Gaudin

Krone-Martins

Sedaghat

et al. 2019

A&A

125

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Context. Open clusters (OCs) are popular tracers of the structure and evolutionary history of the Galactic disk. The OC population is often considered to be complete within 1.8 kpc of the Sun. The recent Gaia Data Release 2 (DR2) allows the latter claim to be challenged. Aims. We perform a systematic search for new OCs in the direction of Perseus using precise and accurate astrometry from Gaia DR2. Methods. We implement a coarse-to-fine search method. First, we exploit spatial proximity using a fast density-aware partitioning of the sky via a k-d tree in the spatial domain of Galactic coordinates, (l, b). Secondly, we employ a Gaussian mixture model in the proper motion space to quickly tag fields around OC candidates. Thirdly, we apply an unsupervised membership assignment method, UPMASK, to scrutinise the candidates. We visually inspect colour-magnitude diagrams to validate the detected objects. Finally, we perform a diagnostic to quantify the significance of each identified overdensity in proper motion and in parallax space. Results. We report the discovery of 41 new stellar clusters. This represents an increment of at least 20% of the previously known OC population in this volume of the Milky Way. We also report on the clear identification of NGC 886, an object previously considered an asterism. This study challenges the previous claim of a near-complete sample of open clusters up to 1.8 kpc. Our results reveal that this claim requires revision, and a complete census of nearby open clusters is yet to be found.

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“…We used proper motion measurements from the second data release from the Gaia mission (DR2; Gaia Collaboration et al 2016Collaboration et al , 2018Salgado et al 2017) as an additional avenue to exclude non-members since members of a globular cluster should have similar proper motions. To identify the systemic proper motion of each cluster, we generated 2d histograms of the proper motions with a binsize of 0.2 mas/yr in µ α and µ δ .…”

Section: Comparison To Globular Clustersmentioning

confidence: 99%

Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

Chiti¹,

Frebel²,

Jerjen

et al. 2020

ApJ

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We present a study of the ultra-faint Milky Way dwarf satellite galaxy Tucana II using deep photometry from the 1.3 m SkyMapper telescope at Siding Spring Observatory, Australia. The SkyMapper filter-set contains a metallicity-sensitive intermediate-band v filter covering the prominent Ca II K feature at 3933.7Å. When combined with photometry from the SkyMapper u, g, and i filters, we demonstrate that v band photometry can be used to obtain stellar metallicities with a precision of ∼ 0.20 dex when [Fe/H] > −2.5, and ∼ 0.34 dex when [Fe/H] < −2.5. Since the u and v filters bracket the Balmer Jump at 3646Å, we also find that the filter-set can be used to derive surface gravities. We thus derive photometric metallicities and surface gravities for all stars down to a magnitude of g ∼ 20 within ∼75 arcminutes of Tucana II. Photometric metallicity and surface gravity cuts remove nearly all foreground contamination. By incorporating Gaia proper motions, we derive quantitative membership probabilities which recover all known members on the red giant branch of Tucana II. Additionally, we identify multiple likely new members in the center of the system and candidate members several half-light radii from the center of the system. Finally, we present a metallicity distribution function derived from the photometric metallicities of likely Tucana II members. This result demonstrates the utility of wide-field imaging with the SkyMapper filter-set in studying UFDs, and in general, low surface brightness populations of metal-poor stars. Upcoming work will clarify the membership status of several distant stars identified as candidate members of Tucana II.

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The ESA Gaia Archive: Data Release 1

Cited by 36 publications

References 15 publications

GaiaData Release 1

GaiaData Release 1

Gaia DR2 unravels incompleteness of nearby cluster population: new open clusters in the direction of Perseus

Stellar Metallicities from SkyMapper Photometry I: A Study of the Tucana II Ultra-faint Dwarf Galaxy

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