Figure 3.
VLA OH maser spectra
of the eastern (top) and
western (bottom, offset
by -4 mJy) nuclei. The
vertical, dashed gray
lines mark the expected,
redshifted frequencies for
the 1612, 1665, 1667, and
1712 MHz maser features.
Two spectral features are
detected at the position
of the eastern nucleus,
marked OH1 and OH2.
OH maser sources associated with the east-
ern member of the pair (Figure 3).
The GMOS/IFU observations cover the in-
ner ~ 6 kpc of the eastern member of IRAS
F23199+0123 (IRAS F23199E) at a spatial
resolution of 2.3 kpc. The data allowed us to
discover that IRAS F23199E shows a Seyfert
1 active nucleus. This was only possible due
to the better quality of the Gemini data as
compared to previous spectra; this allowed
the detection of a nuclear, spatially unre-
solved, broad double-peaked component
in the H-alpha emission line with Full-Width
at Half-Maximum of ~ 2,200 km/s (Figure 4).
From these data we derive a black hole mass
of M {BH} = 3.8 {+0.3}_{-0.2} × 10 6 M .
b
The gas velocity field of IRAS F23199E shows
a disturbed rotation pattern with the line of
the nodes oriented along position angle 95º.
We fitted this velocity field by a thin rotat-
ing disk model. The residuals between the
observed and modeled velocities combined
with the velocity dispersion maps suggest
the presence of non-circular motions, possi-
bly due to outflows from the nucleus along
the north-south direction (blueshifts seen
in the residual map of Figure 5) and inflows
towards the nucleus and its vicinity (redshifts
close to the nucleus observed in the residual
map of Figure 5).
The gas kinematics also show low velocity
dispersions (σ) and low [N II]/H-alpha ratios
Figure 4.
Fit of the nuclear
spectrum (within 0.8
arcsecond) of the IRAS
F23199E nucleus,
which comprises the
H-alpha+[NII] complex.
The observed profile is
shown in black, while
the blue dotted lines
represent the broad and
narrow components. The
red line is the result of the
fit, and the green dotted
line shows the residual of
the fit plus an arbitrary
constant.
8
GeminiFocus
July 2018