Photometric content and validation
journal contribution
posted on 2019-09-24, 13:09 authored by DW Evans, M Riello, F De Angeli, JM Carrasco, P Montegriffo, C Fabricius, C Jordi, L Palaversa, C Diener, G Busso, C Cacciari, F van Leeuwen, PW Burgess, M Davidson, DL Harrison, ST Hodgkin, E Pancino, PJ Richards, G Altavilla, L Balaguer-Nunez, MA Barstow, M Bellazzini, AGA Brown, M Castellani, G Cocozza, F De Luise, A Delgado, C Ducourant, S Galleti, G Gilmore, G Giuffrida, B Holl, A Kewley, SE Koposov, S Marinoni, PM Marrese, PJ Osborne, A Piersimoni, J Portell, L Pulone, S Ragaini, N Sanna, D Terrett, NA Walton, T Wevers, L WyrzykowskiAims. We describe the photometric content of the second data release of the Gaia project (Gaia DR2) and its validation along with the quality of the data.
Methods. The validation was mainly carried out using an internal analysis of the photometry. External comparisons were also made, but were limited by the precision and systematics that may be present in the external catalogues used.
Results. In addition to the photometric quality assessment, we present the best estimates of the three photometric passbands. Various colour-colour transformations are also derived to enable the users to convert between the Gaia and commonly used passbands.
Conclusions. The internal analysis of the data shows that the photometric calibrations can reach a precision as low as 2 mmag on individual CCD measurements. Other tests show that systematic effects are present in the data at the 10 mmag level.
Funding
This work presents results from the European Space Agency (ESA) space mission Gaia. Gaia data are being processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC is provided by national institutions, in particular the institutions participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission website is https://www.cosmos.esa.int/gaia. The Gaia Archive website is http://gea.esac.esa.int/archive/. This work has been supported by the United Kingdom Rutherford Appleton Laboratory, the United Kingdom Science and Technology Facilities Council (STFC) through grant ST/L006553/1, and the United Kingdom Space Agency (UKSA) through grant ST/N000641/1. This work was supported by the MINECO (Spanish Ministry of Economy) through grant ESP2016-80079-C2-1-R (MINECO/FEDER, UE) and ESP2014-55996-C2-1-R (MINECO/FEDER, UE) and MDM-2014-0369 of ICCUB (Unidad de Excelencia “María de Maeztu”). This work was supported by the Italian funding agencies Agenzia Spaziale Italiana (ASI) through grants I/037/08/0, I/058/10/0, 2014-025- R.0, and 2014- 025-R.1.2015 to INAF and contracts I/008/10/0 and 2013/030/I.0 to ALTEC S.p.A and Istituto Nazionale di Astrofisica (INAF). This research has made use of the APASS database, located at the AAVSO web site. Funding for APASS has been provided by the Robert Martin Ayers Sciences Fund. We thank A. Vallenari for supplying us with spectra for the validation of the external flux calibration and passband determination
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Citation
Astronomy and Astrophysics, 2018, 616, A4Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and AstronomyVersion
- VoR (Version of Record)
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Astronomy and AstrophysicsPublisher
EDP Sciences for European Southern Observatory (ESO)issn
1432-0746Acceptance date
2018-03-09Copyright date
2018Available date
2019-09-24Publisher DOI
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https://www.aanda.org/articles/aa/abs/2018/08/aa32756-18/aa32756-18.htmlLanguage
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