Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galactic bulges from Hubble Space Telescope NICMOS observations: the
  lack of r^{1/4} bulges   We use HST near-infrared imaging to explore the shapes of the surface
brightness profiles of bulges of S0-Sbc galaxies at high resolution. Modeling
extends to the outer bulge via bulge-disk decompositions of combined HST -
ground based profiles. Compact, central unresolved components similar to those
reported by others are found in ~84% of the sample. We also detect a moderate
frequency (~34%) of nuclear components with exponential profiles which may be
disks or bars. Adopting the S\'ersic r^{1/n} functional form for the bulge,
none of the bulges have an r^{1/4} behaviour; derived S\'ersic shape-indices
are <n> = 1.7 \pm 0.7. For the same sample, fits to NIR ground-based profiles
yield S\'ersic indices up to n = 4-6. The high-$n$ of ground-based profiles are
a result of nuclear point sources blending with the bulge extended light due to
seeing. The low S\'ersic indices are not expected from merger violent
relaxation, and argue against significant merger growth for most bulges.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int