Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust attenuation in the nearby Universe: comparison between galaxies
  selected in the ultraviolet or in the infrared   We compare the dust attenuation properties of two samples of galaxies purely
selected in the near-ultraviolet (NUV) band (1750-2750 A, lambda_m = 2310 A)
and in the far-infrared (FIR) at 60micron. These samples are built using the
GALEX and IRAS sky surveys over ~600 square degrees. The NUV selected sample
contains 95 galaxies detected down to NUV=16mag (AB system). 83 galaxies in
this sample are spirals or irregulars and only two of them are not detected at
60micron. The FIR selected sample is built from the IRAS PSCz catalog complete
down to 0.6Jy. Among the 163 sources, we select 118 star forming galaxies well
measured by IRAS, all but 1 are detected in NUV and 14 galaxies are not
detected in the far-ultraviolet (FUV) band (1350-1750 A, lambda_m = 1530 A).
The dust to ultraviolet (NUV and FUV) flux ratio is calibrated to estimate the
dust attenuation at both wavelengths. The median value of the attenuation in
NUV is found to be ~1 mag for the NUV selected sample versus ~2 mag for the FIR
selected one. Within both samples, the dust attenuation is found to correlate
with the luminosity of the galaxies. Almost all the NUV selected galaxies and
2/3 of the FIR selected sample exhibit a lower dust attenuation than that
expected from the tight relation found previously for starburst galaxies
between the dust attenuation and the slope of the ultraviolet continuum. The
situation is inverse for one third of the FIR selected galaxies: their
extinction is higher than that deduced from their FUV-NUV color and the
relation valid for starbursts.

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The categories of this paper are: solv-int
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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: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: hep-ph