Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the Galactic Bulge with deep Adaptive Optics imaging: the age of
  NGC 6440   We present first results of a pilot project aimed at exploiting the
potentiality of ground based adaptive optics imaging in the near infrared to
determine the age of stellar clusters in the Galactic Bulge. We have used a
combination of high resolution adaptive optics (ESO-VLT NAOS-CONICA) and
wide-field (ESO-NTT-SOFI) photometry of the metal rich globular cluster NGC
6440 located towards the inner Bulge, to compute a deep color magnitude diagram
from the tip of the Red Giant Branch down to J~22$, two magnitudes below the
Main Sequence Turn Off (TO). The magnitude difference between the TO level and
the red Horizontal Branch has been used as an age indicator. It is the first
time that such a measurement for a bulge globular cluster has been obtained
with a ground based telescope. From a direct comparison with 47 Tuc and with a
set of theoretical isochrones, we concluded that NGC 6440 is old and likely
coeval to 47 Tuc. This result adds a new evidence that the Galactic Bulge is ~2
Gyr younger at most than the pristine, metal poor population of the Galactic
Halo.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: physics
1
The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: stat