Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust Embedded Sources at the Galactic Center. 2 to 4$\mu$m imaging and
  spectroscopy in the central parsec   We present the first L-band spectroscopic observations for a dozen stellar
sources in the central 0.5 pc of the GC stellar cluster that are bright in the
2-4 micron wavelength domain. With the aid of additional K-band spectroscopic
data, we derive optical depth spectra of the sources after fitting their
continuum emission with a single reddened blackbody continuum. We also derive
intrinsic source spectra by correcting the line of sight extinction via the
optical depth spectrum of a late type star that is most likely not affected by
local dust emission or extinction at the Galactic Center. The good agreement
between the two approaches shows that the overall variation of the
line-of-sight extinction across the central 0.5 pc is $\Delta
A_{\mathrm{K}}\leq0.5$ mag. The extinction corrected spectra of the hot
He-stars are in good agreement with pure Rayleigh Jeans continuum spectra. The
intrinsic spectra of all other sources are in agreement with continuum emission
and absorption features due to the dust in which they are embedded. We
interprete both facts as evidence that a significant amount of the absorption
takes place within the central parsec of the Galactic Center and is most likely
associated with the individual sources there. We find absorption features at
3.0 micron, 3.4 micron, and 3.48 micron wavelength. Correlations between all
three features show that they are very likely to arise in the ISM of the
central 0.5 pc. Spectroscopy of high MIR-excess sources 0.5'' north of the IRS
13 complex is largely consistent with them being YSOs. However, a bow-shock
nature of these sources cannot be excluded.

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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: stat