Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Herschel Filament: a signature of the environmental drivers of
  galaxy evolution during the assembly of massive clusters at z=0.9   We have discovered a 2.5 Mpc (projected) long filament of infrared-bright
galaxies connecting two of the three ~5x10^14 Msun clusters making up the RCS
2319+00 supercluster at z=0.9. The filament is revealed in a deep Herschel
Spectral and Photometric Imaging REceiver (SPIRE) map that shows 250-500um
emission associated with a spectroscopically identified filament of galaxies
spanning two X-ray bright cluster cores. We estimate that the total (8-1000um)
infrared luminosity of the filament is Lir~5x10^12 Lsun, which, if due to star
formation alone, corresponds to a total SFR 900 Msun/yr. We are witnessing the
scene of the build-up of a >10^15 Msun cluster of galaxies, seen prior to the
merging of three massive components, each of which already contains a
population of red, passive galaxies that formed at z>2. The infrared filament
demonstrates that significant stellar mass assembly is taking place in the
moderate density, dynamically active circumcluster environments of the most
massive clusters at high-redshift, and this activity is concomitant with the
hierarchical build-up of large scale structure.

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The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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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: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th