Diffuse radio source below the NVSS catalog brightness limit. Very
uncertain S(1.4 GHz).
NGC 6647: This is a bar-ringed galaxy, and weak CO emission has been detected.
The obtained PV diagram is not of high-quality, but can be used to trace
rotation velocities, indicating a steep rise of rotation up to 250 km s^-1^
within a few hundred pc of the center.
NGC 6674.--The global blue M/L of 2.6 implies that MOND successfully accounts
for the magnitude of the discrepancy; however, the detailed fit is the worst
of the sample. The large central rotational velocities and mildly declining
rotation curve require a strong central mass concentration. The
double-exponential decomposition of the radial light profile by Andredakis
does imply that a large fraction of the total luminosity is in the bulge, and
this yields reasonable mass-to-fight ratios for the bulge and disk. But the
real difficulty with the use of this rotation curve is that the galaxy is
conspicuously barred (Broeils & Knapen 1991). Moreover, the bar is oriented
along the apparent minor axis of the galaxy as projected onto the sky, which,
because of elliptical streaming, would have the effect of increasing the
apparent rotational velocity in the inner regions. Because of its large-scale
nonaxisymmetric structure, this galaxy is clearly not very suitable for
detailed rotation-curve modeling.
SB(r)b (de Vaucouleurs)
Very bright nucleus in a bright bar: 0.5 arcmin x 0.17 arcmin. (r):
0.9 arcmin x 0.6 arcmin. Several filamentary, faint branching arms with some
knots. Low surface brightness.
Heidelberg Veroff. Vol. 9, 1926 dimensions: (0.2? arcmin x 0.2? arcmin) were
rejected, nucleus only.