6 research outputs found
Shaping point- and mirror-symmetric proto-planetary nebulae by the orbital motion of the central binary system
We present 3D hydrodynamical simulations of a jet launched from the secondary
star of a binary system inside a proto-planetary nebula. The secondary star
moves around the primary in a close eccentric orbit. From the gasdynamic
simulations we compute synthetic [NII] 6583 emission maps. Different jet axis
inclinations with respect to the orbital plane, as well as different
orientations of the flow with respect to the observer are considered. For some
parameter combinations, we obtain structures that show point- or
mirror-symmetric morphologies depending on the orientation of the flow with
respect to the observer. Furthermore, our models can explain some of the
emission distribution asymmetries that are summarized in the classification
given by Soker & hadar (2002).Comment: 15 pages, 3 figures, 2 tables, Accepted in Apj Letter
IC5063: AGN driven outflow of warm and cold gas
We present new ATCA 17- and 24-GHz radio images and ESO-NTT optical spectra
of the radio-loud Seyfert galaxy IC5063, the first galaxy in which a fast (~
600 km/s) outflow of neutral hydrogen was discovered. The new radio data
confirm the triple radio structure with a central core and two resolved radio
lobes. This implies that the previously detected fast outflow of neutral gas is
occurring off-nucleus, near a radio lobe about 0.5 kpc from the core. The
ionised gas shows complex kinematics in the region co-spatial with the radio
emission. Broad and blueshifted (~ 500 km/s) emission is observed in the region
of the radio lobe, at the same location as the blueshifted HI absorption. The
velocity of the ionised outflow is similar to the one found in HI. The first
order correspondence between the radio and optical properties suggests that the
outflow is driven by the interaction between the radio jet and the ISM. Despite
the high outflow velocities, no evidence is found for the ionisation of the gas
being due to fast shocks in the region of the outflow, indicating that
photoionisation from the AGN is likely to be the dominant ionisation mechanism.
The outflow rate of the warm (ionised) gas is small compared to that of the
cold gas. The mass outflow rate associated with the HI is in the same range as
for ``mild'' starburst-driven superwinds in ULIRGs. However, in IC5063, the
AGN-driven outflow appears to be limited to the inner kpc region of the galaxy.
The kinetic power associated with the HI outflow is a small fraction (a few x
10^-4) of the Eddington luminosity of the galaxy but is a significant fraction
(~ 0.1) of the nuclear bolometric luminosity. In IC5063, the outflows may have
sufficient kinetic power to have a significant impact on the evolution of the
ISM in the host galaxy.Comment: Accepted for publication in A&A, 11 pages, 8 figure