Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is the black hole in NGC1277 really over-massive?   A claim has been made by van den Bosch et al. (2012) that NGC1277 hosts an
over-massive BH with a mass larger than half its spheroid mass. We revisit this
claim by examining the predictions from dynamical realisations based on new MGE
models of NGC1277. We present realisations which fit the observed photometry.
M/L is fixed following scaling relations which predict a Salpeter-like IMF. A
model without a BH provides a surprisingly good fit of the observed kinematics
outside the unresolved central region, but not, as expected, of the central
dispersion and h4 values. A model with a MBH of 5 10^9 Msun allows to fit the
dispersion profile, consistently with models of the same mass and M/L in
vdB+12. It departs from the central h4 values by only about twice the given
uncertainty. A slightly varying M/L or the addition of high velocity stars
would further lower the need for a very massive BH. These results do not rule
out the presence of an over-massive BH at the centre of NGC1277. However, they
lead us to advocate the use of 3-sigma confidence intervals for derived MBH as
better, more conservative, guidelines for such studies. We caution for the use
of ill-defined spheroidal components as an input for scaling relations, and
emphasise the fact that a MBH in the range 2-5 10^9 Msun would represent less
than 5% of the spheroid mass of our models. This would make the BH in NGC1277
consistent or just twice as large as what a recent version of the MBH-sigma
relation predicts. We examine the impact of the presence of a bar by running
simulations from the same MGE model but with extreme anisotropies. An inner
small bar forms, and an end-on view gets closer to fitting the central
dispersion profile without the need for a central BH, while adding a black hole
of 2.5 10^9 Msun, in line with the prediction from scaling relations, allows to
fit the dispersion peak and h3 profiles. EDITED and ABRIDGED.

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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc