Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/27042
Title: | Globular clusters with Gaia | Authors: | PANCINO, ELENA BELLAZZINI, Michele Giuffrida, G. MARINONI, SILVIA |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 467 | Issue: | 1 | First Page: | 412 | Abstract: | The treatment of crowded fields in Gaia data will only be a reality in a few years from now. In particular, for globular clusters, only the end-of-mission data (public in 2022-2023) will have the necessary full crowding treatment and will reach sufficient quality for the faintest stars. As a consequence, the work on the deblending and decontamination pipelines is still ongoing. We describe the present status of the pipelines for different Gaia instruments, and we model the end-of-mission crowding errors on the basis of available information. We then apply the nominal post-launch Gaia performances, appropriately worsened by the estimated crowding errors, to a set of 18 simulated globular clusters with different concentration, distance and field contamination. We conclude that there will be 10<SUP>3</SUP>-10<SUP>4</SUP> stars with astrometric performances virtually untouched by crowding (contaminated by <1 mmag) in the majority of clusters. The most limiting factor will be field crowding, not cluster crowding: the most contaminated clusters will only contain 10-100 clean stars. We also conclude that (I) the systemic proper motions and parallaxes will be determined to 1 per cent or better up to ≃15 kpc, and the nearby clusters will have radial velocities to a few km s<SUP>-1</SUP>; (II) internal kinematics will be of unprecedented quality, cluster masses will be determined to ≃10 per cent up to 15 kpc and beyond, and it will be possible to identify differences of a few km s<SUP>-1</SUP> or less in the kinematics (if any) of cluster sub-populations up to 10 kpc and beyond; (III) the brightest stars (V ≃ 17 mag) will have space-quality, wide-field photometry (mmag errors), and all Gaia photometry will have 1-3 per cent errors on the absolute photometric calibration. | URI: | http://hdl.handle.net/20.500.12386/27042 | URL: | https://academic.oup.com/mnras/article/467/1/412/2896688 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx079 | Bibcode ADS: | 2017MNRAS.467..412P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stx079.pdf | Pdf editoriale | 4.38 MB | Adobe PDF | View/Open |
Page view(s)
57
checked on Jun 18, 2024
Download(s)
47
checked on Jun 18, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.