Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The First Detections of the Extragalactic Background Light at 3000,
  5500, and 8000A (I): Results   (Abridged) We present the first detections of the mean flux of the optical
extragalactic background light (EBL) at 3000, 5500, and 8000A. Diffuse
foreground flux at these wavelengths comes from terrestrial airglow,
dust-scattered sunlight (zodiacal light), and dust-scattered Galactic starlight
(diffuse Galactic light). We have avoided the brightest of these, terrestrial
airglow, by measuring the absolute surface brightness of the night sky from
above the Earth's atmosphere using the Wide Field Planetary Camera2 (WFPC2) and
Faint Object Spectrograph (FOS), both aboard the Hubble Space Telescope (HST).
On the ground, we have used the duPont 2.5 m Telescope at Las Campanas
Observatory (LCO) to obtain contemporaneous spectrophotometry of ``blank'' sky
in the HST field of view to measure and then subtract foreground zodiacal light
from the HST observations. We have minimized the diffuse Galactic light in
advance by selecting the HST target field along a line of sight with low
Galactic dust column density, and then estimated the low--level Galactic
foreground using a simple scattering model and the observed correlation between
thermal, 100 micron emission and optical scattered flux from the same dust. In
this paper, we describe the coordinated LCO/HST program and the HST
observations and data reduction, and present the resulting measurements of the
EBL.

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The categories of this paper are: nucl-ex
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: physics
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph