Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Correlation between X-ray and UV Properties of BAL QSOs   We compile a large sample of broad absorption lines (BAL) quasars with X-ray
observations from the \xmm archive data and Sloan Digital Sky Survey Data
Release 5. The sample consists of 41 BAL QSOs. Among 26 BAL quasars detected in
X-ray, spectral analysis is possible for twelve objects. X-ray absorption is
detected in all of them. Complementary to that of \citet{gall06} (thereafter
G06), our sample spans wide ranges of both BALnicity Index (BI) and maximum
outflow velocity (\vmax). Combining our sample with G06's, we find very
significant correlations between the intrinsic X-ray weakness with both
BALnicity Index (BI) and the maximum velocity of absorption trough. We do not
confirm the previous claimed correlation between absorption column density and
broad absorption line parameters. We tentatively interpret this as that X-ray
absorption is necessary to the production of the BAL outflow, but the
properties of the outflow are largely determined by intrinsic SED of the
quasars.

19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an