Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intrinsic Absorption in NGC 7469   We present results from a coordinated FUSE, HST/STIS and Chandra campaign to
study intrinsic UV and X-ray absorption in the outflow of the Seyfert 1 galaxy
NGC 7469. Previous non-simultaneous observations of this outflow found two
distinct UV absorption components, one of which likely corresponds to the X-ray
absorber. The FUSE data reveal that the O VI absorption in this component has
strengthened over time, as the continuum flux decreased. We use measured H I, N
V, C IV, and O VI column densities to model self-consistently the
photoionization state of the absorbers. We confirm the physical picture of the
outflow in which the low velocity component is a highly ionized, high density
absorber located near the broad emission line region, while the high velocity
component is of lower density and resides farther from the central engine.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
3
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: dg-ga
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph