5-12 pc resolution ALMA imaging of gas and dust in the obscured compact nucleus of IRAS 17578-0400. (arXiv:2307.07641v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Yang_C/0/1/0/all/0/1">Chentao Yang</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Aalto_S/0/1/0/all/0/1">Susanne Aalto</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Konig_S/0/1/0/all/0/1">Sabine K&#xf6;nig</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Palacio_S/0/1/0/all/0/1">Santiago Del Palacio</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Gorski_M/0/1/0/all/0/1">Mark Gorski</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Linden_S/0/1/0/all/0/1">Sean Linden</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Muller_S/0/1/0/all/0/1">Sebastien Muller</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Onishi_K/0/1/0/all/0/1">Kyoko Onishi</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Sato_M/0/1/0/all/0/1">Mamiko Sato</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Wethers_C/0/1/0/all/0/1">Clare Wethers</a> (1) ((1) Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, (2) Department of Astronomy, University of Massachusetts at Amherst)

We here present 0.02-0.04” resolution ALMA observation of the compact
obscured nucleus (CON) of IRAS17578-0400. A dusty torus within the nucleus,
approximately 4 pc in radius, has been uncovered, exhibiting a usually flat
spectral index at ALMA band 3, likely due to the millimeter corona emission
from the central supermassive black hole (SMBH). The dense gas disk, traced by
$^{13}$CO(1-0), spans 7 pc in radius and suggests an outflow driven by a disk
wind due to its asymmetrical structure along the minor axis. Collimated
molecular outflows (CMO), traced by the low-velocity components of the HCN(3-2)
and HCO$^+$(3-2) lines, align with the minor axis gas disk. Examination of
position-velocity plots of HCN(3-2) and HCO$^+$(3-2) reveals a flared dense gas
disk extended a radius of $sim$ 60 pc, infalling and rotating at speeds of
about 200 km/s and 300 km/s, respectively. A centrifugal barrier, located
around 4 pc from the dynamical center, implies an SMBH mass of approximately
10$^8$ $M_odot$, consistent with millimeter corona emission estimates. The CMO
maintains a steady rotation speed of 200 km/s over the 100 pc scale along the
minor axis. The projected speed of the CMO is about 80 km/s, corresponding to
around $sim$ 500 km/s, assuming an inclination angle of 80$^circ$. Such a
kinematics structure of disk-driven collimated rotating molecular outflow with
gas supplies from a falling rotating disk indicates that the feedback of the
compact obscured nucleus is likely regulated by the momentum transfer of the
molecular gas that connects to both the feeding of the nuclear starburst and
supermassive black hole.

We here present 0.02-0.04” resolution ALMA observation of the compact
obscured nucleus (CON) of IRAS17578-0400. A dusty torus within the nucleus,
approximately 4 pc in radius, has been uncovered, exhibiting a usually flat
spectral index at ALMA band 3, likely due to the millimeter corona emission
from the central supermassive black hole (SMBH). The dense gas disk, traced by
$^{13}$CO(1-0), spans 7 pc in radius and suggests an outflow driven by a disk
wind due to its asymmetrical structure along the minor axis. Collimated
molecular outflows (CMO), traced by the low-velocity components of the HCN(3-2)
and HCO$^+$(3-2) lines, align with the minor axis gas disk. Examination of
position-velocity plots of HCN(3-2) and HCO$^+$(3-2) reveals a flared dense gas
disk extended a radius of $sim$ 60 pc, infalling and rotating at speeds of
about 200 km/s and 300 km/s, respectively. A centrifugal barrier, located
around 4 pc from the dynamical center, implies an SMBH mass of approximately
10$^8$ $M_odot$, consistent with millimeter corona emission estimates. The CMO
maintains a steady rotation speed of 200 km/s over the 100 pc scale along the
minor axis. The projected speed of the CMO is about 80 km/s, corresponding to
around $sim$ 500 km/s, assuming an inclination angle of 80$^circ$. Such a
kinematics structure of disk-driven collimated rotating molecular outflow with
gas supplies from a falling rotating disk indicates that the feedback of the
compact obscured nucleus is likely regulated by the momentum transfer of the
molecular gas that connects to both the feeding of the nuclear starburst and
supermassive black hole.

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