English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present deep near-infrared (NIR) J, Ks photometry of the old, metal-poorGalactic globular cluster M\,15 obtained with images collected with the LUCI1and PISCES cameras available at the Large Binocular Telescope (LBT). We showhow the use of First Light Adaptive Optics system coupled with the (FLAO)PISCES camera allows us to improve the limiting magnitude by ~2 mag in Ks. Byanalyzing archival HST data, we demonstrate that the quality of the LBT/PISCEScolor magnitude diagram is fully comparable with analogous space-based data.The smaller field of view is balanced by the shorter exposure time required toreach a similar photometric limit. We investigated the absolute age of M\,15 bymeans of two methods: i) by determining the age from the position of the mainsequence turn-off; and ii) by the magnitude difference between the MSTO and thewell-defined knee detected along the faint portion of the MS. We deriveconsistent values of the absolute age of M15, that is 12.9+-2.6 Gyr and13.3+-1.1 Gyr, respectively.

The absolute age of the globular cluster M15 using near-infrared adaptive optics images from PISCES/LBT