Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new relativistic component of the accretion disk wind in PDS 456   Past X-ray observations of the nearby luminous quasar PDS 456 (at $z=0.184$)
have revealed a wide angle accretion disk wind (Nardini et al. 2015), with an
outflow velocity of $\sim-0.25c$. Here we unveil a new, relativistic component
of the wind through hard X-ray observations with NuSTAR and XMM-Newton,
obtained in March 2017 when the quasar was in a low flux state. This very fast
wind component, with an outflow velocity of $-0.46\pm0.02c$, is detected in the
iron K band, in addition to the $-0.25c$ wind zone. The relativistic component
may arise from the innermost disk wind, launched from close to the black hole
at radius of $\sim10$ gravitational radii. The opacity of the fast wind also
increases during a possible obscuration event lasting for 50 ks. We suggest
that the very fast wind may only be apparent during the lowest X-ray flux
states of PDS 456, becoming overly ionized as the luminosity increases.
Overall, the total wind power may even approach the Eddington value.

12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci