J/A+A/709/A212ivo://CDS.VizieR/J/A+A/709/A212CDSZullo G.Pallanca C.Ferraro F.R.Lanzoni B.Origlia L.Massari D.,Dalessandro E.Fanelli C.Cadelano M.Vesperini E.Crociati C.,Rich R.M.Valenti E.2026-05-19T11:08:09Z2026-05-19T12:07:37ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frglobular-star-clustersinfrared-photometryThe James Webb Space Telescope provides an exciting opportunity to investigate stellar systems located in heavily obscured regions like the Galactic bulge. Possibly the most enigmatic among them is Terzan 5: long classified as a globular cluster, it is now known to host distinct stellar populations with different iron abundances, ranging approximately from [Fe/H]=-0.8 to [Fe/H]=+0.3dex. Indeed, the chemical and structural properties collected so far suggest that it is the remnant of one of the primordial clumps that contributed to the early assembly of the bulge, a so-called "Bulge Fossil Fragment". Here we present a new photometric analysis of Terzan 5 based on JWST/NIRCam observations in the F115W and F200W filters, as well as archival HST/ACS optical (F606W and F814W) data. The dataset overcomes the severe and spatially variable extinction along the line of sight and yields the deepest color-magnitude diagram ever obtained for Terzan 5. Proper motion selections and high-resolution differential reddening corrections allow us to isolate bona fide cluster members and to provide an unprecedented view of the main-sequence turn-off region. We clearly identify two main components and determine their respective ages: the old, sub-solar component has an age of 12.5+/-0.5Gyr, while the super-solar component is significantly younger, with an age of 4.7+/-0.5Gyr. Interestingly, we also find hints of an even younger main-sequence turn-off and sub-giant branch, consistent with the presence of a further stellar component with an age of 3.8+/-0.5Gyr. There is also evidence of a blue plume populated by stars as bright as m(F115W)~17.4, suggesting a prolonged period of star formation extending up to 2.5Gyr ago.2026A&A...709A.212Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/709/A212CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/308/733 : NTT VI photometry in Terzan 5 (Ortolani+ 1996)J/ApJ/651/1098 : Faint X-ray sources in Terzan 5 (Heinke+, 2006)J/ApJ/726/L20 : Spectroscopy of Terzan 5 (Origlia+, 2011)J/ApJ/791/101 : Terzan 5 chemical and kinematical properties (Massari+, 2014)J/ApJ/795/22 : Iron abundance of Terzan 5 stars (Massari+, 2014)J/A+A/689/A108 : Terzan 5 variables light curves (Figuera Jaimes+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/709/A212https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/709/A212http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/709/A212https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/709/A212https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/709/A212http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/709/A212GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/709/A212/terzan5 (HST+JWST photometric catalog of Terzan 5)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/709/A212/terzan5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/709/A212/terzan5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/709/A212/terzan5?GETtext/xml+votable180.050000true267.0118001-24.76465460.0055555555555555566/28899 289058.96275300427713e-20 3.5452907792336973e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/709/A212?format=asciiInfrareddefaultJ/A+A/709/A212/terzan5HST+JWST photometric catalog of Terzan 5recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar IDmeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedF606W? Magnitude in HST/ACS F606Wmagphot.mag;em.opt.Rfloatnullablee_F606W? Uncertainty on F606Wmagstat.errorfloatnullableF814W? Magnitude in HST/ACS F814Wmagphot.mag;em.opt.Ifloatnullablee_F814W? Uncertainty on F814Wmagstat.errorfloatnullableF115W? Magnitude in JWST/NIRCam F115Wmagphot.mag;em.IR.Jfloatnullablee_F115W? Uncertainty on F115Wmagstat.errorfloatnullableF200W? Magnitude in JWST/NIRCam F200Wmagphot.mag;em.IR.Hfloatnullablee_F200W? Uncertainty on F200Wmagstat.errorfloatnullabledE(B-V)VI? Differential reddening dE(B-V) opticalmagphot.color.excessfloatnullabledE(B-V)JKDifferential reddening dE(B-V) NIRmagphot.color.excessfloat