التفاصيل البيبلوغرافية
| العنوان: |
Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge. |
| المؤلفون: |
Palma, Tali, Minniti, Dante, Alonso-García, Javier, Crestani, Juliana, Netzel, Henryka, Clariá, Juan J, Saito, Roberto K, Dias, Bruno, Fernández-Trincado, José G, Kammers, Roberto, Geisler, Douglas, Gómez, Matías, Hempel, Maren, Pullen, Joyce |
| المصدر: |
Monthly Notices of the Royal Astronomical Society; 8/15/2019, Vol. 487 Issue 3, p3140-3149, 10p |
| مصطلحات موضوعية: |
GALACTIC bulges, GLOBULAR clusters, VARIABLE stars, RR Lyrae stars, MILKY Way, NATURE, ANGULAR distance |
| مستخلص: |
In order to characterize 22 new globular cluster (GC) candidates in the Galactic bulge, we present their colour–magnitude diagrams (CMDs) and K s -band luminosity functions (LFs) using the near-infrared VVV database as well as Gaia-DR2 proper motion data set. CMDs were obtained, on one hand, after properly decontaminating the observed diagrams from background/foreground disc stars and other sources. On the other hand, CMDs were also obtained based upon star selection in proper motion diagrams. Taking into account our deep CMDs and LFs analyses, we find that 17 out of 22 new GC candidates may be real and should therefore be followed up, while 5 candidates were discarded from the original sample. We also search for RR Lyrae and Mira variable stars in the fields of these new GC candidates. In particular, we confirm that Minni 40 may be a real cluster. If confirmed by further follow-up analysis, it would be the closest GC to the Galactic centre in projected angular distance, located only 0.5° away from it. We consider that it is very difficult to confirm the physical reality of these small, poorly-populated bulge GCs so in many cases alternative techniques are needed to corroborate our findings. [ABSTRACT FROM AUTHOR] |
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