Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Globular Clusters with Tidal Tails: Deep Two-Color Star Counts   We examine the outer structure of 12 Galactic globular clusters using
star-count analyses. Deep, two-color, photographic photometry is used to select
and count stars with colors and magnitudes consistent with cluster-specific,
color-magnitude sequences. The resulting reduction in the number of
contaminating foreground stars allows us to push the star counts to
significantly lower surface densities than has previously been possible. We
find that most of our sample clusters show extra-tidal wings in their surface
density profiles. The form of the surface density profiles is consistent with
recent numerical studies of the tidal stripping of globular clusters.
Two-dimensional surface density maps for several clusters are consistent with
the expected appearance of tidal tails, with allowance for the effects of orbit
shape, orbital phase, and orientation of our line of sight. We identify the
extra-tidal material with stars which are still in the process of being removed
from the clusters. The extra-tidal stars effectively limit the accuracy to
which we can resolve the ``tidal'' radii of globular clusters. However, by
tracing the orbital paths of their parent clusters, these stars may also
facilitate a renewed attack on the problem of determining globular cluster
orbits and the shape of the Galactic potential field.

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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: math