A Near Infrared View of Nearby Galaxies: The Case of NGC 6300. (arXiv:1902.02373v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Gaspar_G/0/1/0/all/0/1">Gaia Gaspar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Diaz_R/0/1/0/all/0/1">Rubén Díaz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mast_D/0/1/0/all/0/1">Damián Mast</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+DAmbra_A/0/1/0/all/0/1">Ary D'Ambra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Aguero_M/0/1/0/all/0/1">María Paz Agüero</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gunthardt_G/0/1/0/all/0/1">Guillermo Günthardt</a>
We present a near-infrared study of the Seyfert 2 galaxy NGC,6300, based on
subarcsecond images and long slit spectroscopy obtained with Flamingos-2 at
Gemini South. We have found that the peak of the nuclear continuum emission in
the $K_s$ band and the surrounding nuclear disk are 25,pc off-center with
respect to the center of symmetry of the larger scale circumnuclear disk,
suggesting that this black hole is still not fixed in the galaxy potential
well. The molecular gas radial velocity curve yields a central black hole upper
mass estimation of $M_{SMBH}^{upper}=(6pm 2) times 10^{7},Msun$. The
Pa$beta$ emission line has a strongly asymmetric profile with a blueshifted
broad component that we associate with a nuclear ionized gas outflow. We have
found in the $K_s$-band spectra that the slope of the continuum becomes steeper
with increasing radii, which can be explained as the presence of large amounts
of hot dust not only in the nucleus but also in the circumnuclear region up to
$r=27$,pc. In fact, the nuclear red excess obtained after subtracting the
stellar contribution resembles to that of a blackbody with temperatures around
1200,K. This evidence supports the idea that absorbing material located around
the nucleus, but not close enough to be the torus of the unified model, could
be responsible for at least part of the nuclear obscuration in this Seyfert 2
nucleus.
We present a near-infrared study of the Seyfert 2 galaxy NGC,6300, based on
subarcsecond images and long slit spectroscopy obtained with Flamingos-2 at
Gemini South. We have found that the peak of the nuclear continuum emission in
the $K_s$ band and the surrounding nuclear disk are 25,pc off-center with
respect to the center of symmetry of the larger scale circumnuclear disk,
suggesting that this black hole is still not fixed in the galaxy potential
well. The molecular gas radial velocity curve yields a central black hole upper
mass estimation of $M_{SMBH}^{upper}=(6pm 2) times 10^{7},Msun$. The
Pa$beta$ emission line has a strongly asymmetric profile with a blueshifted
broad component that we associate with a nuclear ionized gas outflow. We have
found in the $K_s$-band spectra that the slope of the continuum becomes steeper
with increasing radii, which can be explained as the presence of large amounts
of hot dust not only in the nucleus but also in the circumnuclear region up to
$r=27$,pc. In fact, the nuclear red excess obtained after subtracting the
stellar contribution resembles to that of a blackbody with temperatures around
1200,K. This evidence supports the idea that absorbing material located around
the nucleus, but not close enough to be the torus of the unified model, could
be responsible for at least part of the nuclear obscuration in this Seyfert 2
nucleus.
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