Bibcode
Vega Beltran, J. C.; Zeilinger, W. W.; Amico, P.; Schultheis, M.; Corsini, E. M.; Funes, J. G.; Beckman, J.; Bertola, F.
Referencia bibliográfica
VizieR On-line Data Catalog: J/A+AS/131/105. Originally published in: 1998A&AS..131..105V
Fecha de publicación:
2
1998
Número de citas
0
Número de citas referidas
0
Descripción
Rotation curves and velocity dispersion profiles are presented for both
the stellar and gaseous components along five different position angles
(PA =5°, 50°, 95°, 125°, and 155°) of the nearby
barred spiral NGC 6221. The observed kinematics extends out to about
80'' from the nucleus. Narrow and broad-band imaging is also presented.
The radial profiles of the fluxes ratio [NII] (λ
6583.4Å)/Hα reveal the presence of a ring-like structure of
ionized gas, with a radius of about 9'' and a deprojected circular
velocity of about 280km/s. The analysis of the dynamics of the bar
indicates this ring is related to the presence of an inner Lindblad
resonance (ILR) at 1.3kpc. NGC 6221 is found to exhibit intermediate
properties between those of the early-type barred galaxies: the presence
of a gaseous ring at an ILR, the bar edge located between the ILR's and
the corotation radius beyond the steep rising portion of the rotation
curve, the dust-lane pattern, and those of the late-type galaxies: an
almost exponential surface brightness profile, the presence of Hα
regions along all the bar, the spiral-arm pattern. It is consistent with
scenarios of bar-induced evolution from later to earlier-type galaxies.
(6 data files).