Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/32984
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Nardiello, D. | en_US |
dc.contributor.author | Bedin, L. R. | en_US |
dc.contributor.author | Burgasser, A. | en_US |
dc.contributor.author | Salaris, M. | en_US |
dc.contributor.author | CASSISI, Santi | en_US |
dc.contributor.author | Griggio, M. | en_US |
dc.contributor.author | Scalco, M. | en_US |
dc.date.accessioned | 2023-01-23T13:24:57Z | - |
dc.date.available | 2023-01-23T13:24:57Z | - |
dc.date.issued | 2022 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/32984 | - |
dc.description.abstract | As the James Webb Space Telescope (JWST) has become fully operational, early-release data are now available to begin building the tools and calibrations for precision point-source photometry and astrometry in crowded cluster environments. Here, we present our independent reduction of NIRCam imaging of the metal-poor globular cluster M92, which were collected under Director's Discretionary Early Release Science programme ERS-1334. We derived empirical models of the Point Spread Function (PSF) for filters F090W, F150W, F277W, and F444W, and find that these PSFs: (i) are generally under-sampled (FWHM~2 pixel) in F150W and F444W and severely under-sampled (FWHM~1 pixel) in F090W and F277W; (ii) have significant variation across the field of view, up to ~15-20 %; and (iii) have temporal variations of ~3-4 % across multi-epoch exposures. We deployed our PSFs to determine the photometric precision of NIRCam for stars in the crowded, central regions of M92, measured to be at the ~0.01 mag level. We use these data to construct the first JWST colour-magnitude diagrams of a globular cluster. Employing existing stellar models, we find that the data reach almost the bottom of the M92 main sequence (~0.1 M$_{\odot}$), and reveal 24 white dwarf candidate members of M92 in the brightest portion of the white dwarf cooling sequence. The latter are confirmed through a cross-match with archival HST UV and optical data. We also detect the presence of multiple stellar populations along the low-mass main sequence of M92. | en_US |
dc.language.iso | eng | en_US |
dc.title | Photometry and astrometry with JWST -- I. NIRCam Point Spread Functions and the first JWST colour-magnitude diagrams of a globular cluster | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stac2659 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/517/1/484/6705429 | en_US |
dc.identifier.url | http://arxiv.org/abs/2209.06547v1 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 517 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 484 | en_US |
dc.relation.lastpage | 497 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Abruzzo | - |
crisitem.author.orcid | 0000-0003-4080-6466 | - |
crisitem.author.orcid | 0000-0001-5870-3735 | - |
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