Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using 3D Spectroscopy to Probe the Orbital Structure of Composite Bulges   Detailed imaging and spectroscopic analysis of the centers of nearby S0 and
spiral galaxies shows the existence of "composite bulges", where both classical
bulges and disky pseudobulges coexist in the same galaxy. As part of a search
for supermassive black holes in nearby galaxy nuclei, we obtained VLT-SINFONI
observations in adaptive-optics mode of several of these galaxies.
Schwarzschild dynamical modeling enables us to disentangle the stellar orbital
structure of the different central components, and to distinguish the differing
contributions of kinematically hot (classical bulge) and kinematically cool
(pseudobulge) components in the same galaxy.

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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph