Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Carina Nebula: A Laboratory for Feedback and Triggered Star
  Formation   The Carina Nebula (NGC 3372) is our richest nearby laboratory in which to
study feedback through UV radiation and stellar winds from very massive stars
during the formation of an OB association, at an early phase before SNe have
disrupted the environment. This feedback is triggering new generations of star
formation around the periphery of the nebula, while simultaneously evaporating
the gas and dust reservoirs out of which young stars are trying to accrete.
Carina is currently powered by UV radiation from 65 O-type stars and 3 WNH
stars, but for most of its lifetime when its most massive star (Eta Car) was on
the main-sequence, the Carina Nebula was powered by 70 O-type stars that
produced an ionizing luminosity 150 times stronger than in Orion. At a distance
of 2.3 kpc, Carina has the most extreme stellar populationwithin a few kpc of
the Sun, and suffers little interstellar extinction. It is our best bridge
between the detailed star-formation processes that can be studied in nearby
regions like Orion, and much more extreme but also more distant regions like 30
Doradus. Existing observations have only begun to tap the tremendous potential
of this region for understanding the importance of feedback in star formation;
it will provide a reservoir of new discoveries for the next generation of large
ground-based telescopes, space telescopes, and large submillimeter and radio
arrays.

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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: hep-th
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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: stat
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The categories of this paper are: gr-qc
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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: ao-sci
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph