Feeding versus Feedback in NGC4151 probed with Gemini NIFS. II. Kinematics - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We have used the Gemini NIFS to map the gas kinematics of the inner 200x500pcof the Seyfert galaxy NGC4151 in the Z, J, H and K bands at a resolving power5000 and spatial resolution of 8pc. The ionised gas emission is most extendedalong the known ionisation bi-cone at position angle PA=60-240deg, but isobserved also along its equatorial plane. This indicates that the AGN ionizesgas beyond the borders of the bi-cone, within a sphere with 1arcsec radiusaround the nucleus. The ionised gas has three kinematic components: 1 oneobserved at the systemic velocity and interpreted as originating in the galaxydisk; 2 one outflowing along the bi-cone, with line-of-sight velocitiesbetween -600 and 600 km-s and strongest emission at +-100-300km-s; 3 andanother component due to the interaction of the radio jet with ambient gas. Themass outflow rate, estimated to be 1 M Sun-yr along each cone, exceeds theinferred black hole accretion rate by a factor of 100. There is no evidence inour data for the gradual acceleration followed by gradual deceleration proposedby previous modelling of the OIII emitting gas. The molecular gas exhiibitsdistinct kinematics relative to the ionised gas. Its emission arises inextended regions approximately perpendicular to the axis of the bi-cone andalong the axis of the galaxy-s stellar bar, avoiding the innermost ionisedregions. It does not show an outflowing component, being observed only atvelocities very close to systemic, and is thus consistent with an origin in thegalaxy plane. This hot molecular gas may only be the tracer of a largerreservoir of colder gas which represents the AGN feeding.



Autor: T. Storchi-Bergmann, R. D. Simões-Lopes, P. J. McGregor, Rogemar A. Riffel, T. Beck, P. Martini

Fuente: https://arxiv.org/







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