Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A precessing molecular jet signaling an obscured, growing supermassive
  black hole in NGC1377?   With high resolution (0."25 x 0."18) ALMA CO 3-2 observations of the nearby
(D=21 Mpc, 1"=102 pc), extremely radio-quiet galaxy NGC1377, we have discovered
a high-velocity, very collimated nuclear outflow which we interpret as a
molecular jet with a projected length of +-150 pc. Along the jet axis we find
strong velocity reversals where the projected velocity swings from -150 km/s to
+150 km/s. A simple model of a molecular jet precessing around an axis close to
the plane of the sky can reproduce the observations. The velocity of the
outflowing gas is difficult to constrain due to the velocity reversals but we
estimate it to be between 240 and 850 km/s and the jet to precess with a period
P=0.3-1.1 Myr. The CO emission is clumpy along the jet and the total molecular
mass in the high-velocity (+-(60 to 150 km/s)) gas lies between 2e6 Msun (light
jet) and 2e7 Msun (massive jet). There is also CO emission extending along the
minor axis of NGC1377. It holds >40% of the flux in NGC1377 and may be a
slower, wide-angle molecular outflow which is partially entrained by the
molecular jet.
  We discuss the driving mechanism of the molecular jet and suggest that it is
either powered by a very faint radio jet or by an accretion disk-wind similar
to those found towards protostars. The nucleus of NGC1377 harbours intense
embedded activity and we detect emission from vibrationally excited HCN J=4-3
v_2=1f which is consistent with hot gas and dust. We find large columns of H2
in the centre of NGC1377 which may be a sign of a high rate of recent gas
infall. The dynamical age of the molecular jet is short (<1 Myr), which could
imply that it is young and consistent with the notion that NGC1377 is caught in
a transient phase of its evolution. However, further studies are required to
determine the age of the molecular jet, its mass and the role it is playing in
the growth of the nucleus of NGC1377.

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The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th