Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of eight lensing clusters of galaxies   Clusters of galaxies have a huge mass which can act as gravitational lenses.
Galaxies behind clusters can be distorted to form arcs in images by the lenses.
Herein a search was done for giant lensed arcs by galaxy clusters using the
SDSS data. By visually inspecting SDSS images of newly identified clusters in
the SDSS DR8 and Stripe 82 data, we discover 8 strong lensing clusters together
with additional 3 probable and 6 possible cases. The lensed arcs show bluer
colors than the member galaxies of clusters. The masses and optical
luminosities of galaxy clusters interior to the arcs are calculated, and the
mass-to-light ratios are found to be in the range of a few tens of
M_Solar/L_Solar, consistent with the distribution of previously known lensing
clusters.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
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The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas
16
The categories of this paper are: stat
19
The categories of this paper are: eess