Asymmetric and extended radio source.
NGC 4096: This is an Sc galaxy with north-south asymmetry in the optical
brightness distribution. The central CO distribution is also asymmetric, with
the northern half stronger than the south. The PV diagram indicates a rotating
ring of radius ~20" with a rotating velocity of V_i_~85 km s^-1^. The CO
rotation is followed by a flat part at a velocity of ~185 km s^-1^. The nuclear
few arcsec region shows no signiticant CO emission.
Feb 20/21, 1947
Thin, multiple spiral arms are well defined,
but the high inclination of NGC 4096 makes
luminosity classification uncertain. Because of
the rather-well-defined nature of the arms, the
luminosity class has been reassigned here relative
to the II-III class listed in the RSA2.
The redshift of NGC 4096 is v_o = 616 km/s.
The galaxy is tentatively assigned to the M51
Group, which also contains NGC 4258 (v_o = 520 km/s),
NGC 4460 (v_o = 605 km/s), NGC 4490
(v_o = 601 km/s), NGC 4618 (v_o = 563 km/s),
and M51 (v_o = 552 km/s). Whether these
galaxies actually form a physical group, as
suggested by the similarity of their small
redshifts, is uncertain. The maximum separation
of 16^deg^ on the sky of the suggested members
corresponds to a projected linear diameter of the
group of 3.4 Mpc at the mean redshift distance
of 12 Mpc. If M51 is excluded from consideration
of membership, the linear diameter of the
remaining group is smaller, at 2.2 Mpc.
The original plate from which this print was
made was taken with the 60-inch reflector at
Ap. J., 182, 225, 1973.
SAB(rs)c (de Vaucouleurs), Sc+ (Holmberg)
Small, bright nucleus or bar. There is perhaps a faint star superimposed.
Several bright knotty filamentary arms with branches.
Lund 9 and Lund 10 dimensions are for the bright part only.
P.A.S.P., 73, 175, 1961.
I.A.U. Circ. 1731.
A narrow spiral 6' x 1' in p.a. 18^deg^. The whorls are distinct, but irregular.
Bright, rather large nucleus, considerably to the n. of apparent center of
the nebula; numerous almost stellar condensations. 12 s.n.