NGC 3261.---SB(r)a: Bright, centrally condensed nucleus, threaded by a
low surface brightness bar. Ends of the bar intersect two (even lower
surface brightness) arms. The arms do not commence at the ends of the
bar, but instead form a nearly complete inner pseudoring. Beyond the
bar, the arms break away from the ring and can be traced for more
than 180deg. They are diffuse and have obvious kinks in several
places. The east arm has a well-defined ridge line for ~120deg past
the end of the bar, and then turns sharply and becomes very diffuse.
The west arm is never so well defined, but can be traced significantly
farther before it fades away.
March 18/19, 1982
103aO + GG385
NGC 3261 is in the complex region of the Hydra-Centaurus
Supercluster, about 9^deg^ south of the rich Antlia Group, but it has
nearly the same redshift, at v_o = 2307 km/s, as the mean of the
complexity of the galaxy distribution in the region is discussed by
Hopp and Materne (1985).
The arm pattern in NGC 3261 is of the MAS type but is not as
fragmented as the prototype galaxies of that form (NGC 488, NGC 2841,
etc.). However, it is not a pure grand design type either. At least
ten separate spiral fragments can be counted.
Overexposed center, short bar, (r'): 0.7 x 0.55, very knotty arms.
4 companions south, 2 very near.
=ESO 263- G 40
small companions 1.7 south, 2.6 south, 3.7 south following
Regular, thin, smooth arms.
Two inner arms are of moderately high surface brightness.
Smooth outer arms have much lower surface brightness.
Moderate to small nucleus.
The reason for the early-type classification is that no resolution
of arms into knots occurs. Otherwise, on the basis of small
central region, the class would have been SBc.
Non-interacting pair with an anonymous SA at 8.0 arcmin.
Very bright nucleus. Faint (r): 0.9 arcmin x 0.7 arcmin. Strong narrow bar.
2 main regular filamentary arms with branches.
Non-interacting pair with an anonymous SA (1.5 arcmin x 0.45 arcmin) at