Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Carina's Defiant Finger: HST Observations of a Photoevaporating Globule
  in NGC3372   We present HST/WFPC2 images of a prominent externally-ionized molecular
globule in the Carina Nebula (NGC3372), supplemented with ground-based IR
images and visual-wavelength spectra. This molecular globule has a shape
resembling a human hand, with an extended finger that points toward its likely
source of ionizing radiation. The dominant ionizing source of the globule is
either the WNL star WR25 (HD93162), the O4 If-type star Tr16-244, or perhaps
both. We estimate a mass-loss rate of ~2e-5 Msun/yr from the main evaporating
surface of the globule, suggesting a remaining lifetime of 10^5.3 to 10^6
years. We find a total mass for the entire globule of more than 6 Msun, in
agreement with previous estimates. The hydrogen column density through the
globule is a few times 10^22/cm2. Although a few reddened stars are seen within
the boundary of the globule in near-IR continuum images, these may be
background stars. We do not detect a reddened star at the apex of the finger,
for example, down to a limiting magnitude of K=17. However, considering the
physical properties of the globule and the advancing ionization front, it
appears that future star formation is likely in the Finger globule, induced by
radiation-driven implosion.

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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex