Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detecting the Orbital Motion of Nearby Supermassive Black Hole Binaries
  with Gaia   We show that a 10 year Gaia mission could astrometrically detect the orbital
motion of ~1 sub-parsec separation supermassive black hole binary in the heart
of nearby, bright active galactic nuclei (AGN). Candidate AGN lie out to a
redshift of z=0.02 and in the V-band magnitude range $10 \lesssim m_V \lesssim
13$. The distribution of detectable binary masses peaks at a few times $10^7$
solar masses and is truncated above a few times $10^8$ solar masses.

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The categories of this paper are: hep-ex
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The categories of this paper are: math
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph