BCO06 classify this galaxy as type SB0-, where the bar is a well-defined feature
embedded in a huge extended disk component. The bar was also noted by Sandage &
Bedke (1994) but was missed in RC3. De Vaucouleurs & de Vaucouleurs (1964)
pointed out the presence of a lens. Although Sandage & Bedke note that NGC 1574
has a three-zone structure typical of S0 galaxies, BCO06 could not identify a
clear inner lens around the bar. From our K_s_-band image it is difficult to
judge for sure whether this galaxy has a lens or not, but the surface brightness
profile shows three nearly exponential parts, which is the case also in some
other galaxies with lenses in our sample. The bar is embedded inside the middle
exponential component of the disk. The decomposition was carried out starting
from the parameters of the outer disk. Once reasonable approximations were found
for all components, better solutions were searched for separately for each of
them. Finally, all parameters describing these components (except for the
ellipticity of the lens) were left free for fitting. Contrary to the usual case,
for this galaxy the decomposition depends critically on the image resolution: by
rebinning the image by a factor of 4, we find B/T = 0.28 and n = 1.5, whereas
for the original image we obtain B/T = 0.38 and n = 2.9. A possible reason for
the large difference between these two solutions is the compact central cusp at
r = 9", found by Phillips et al. (1996): most probably the cusp is better
resolved in the original image. The fitted lens inside the bar region mainly
improves the model image but does not affect the properties of the bulge.
Subtracting the bulge model from the original image shows a complete inner ring
surrounding the bar, which changes the RC3 s-variety classification to
NGC 1574--The nucleus of this galaxy appears to be unresolved, based on the
very compact central cusp and a faint ring (a possible artifact of the
deconvolution). There is a faint knot located 0.3" (~15 pc projected distance)
directly to the NE of the nucleus, although in our single exposure we cannot
rule out that this is simply a cosmic ray event enhanced by the deconvolution
process. If real, this could be another nuclear component (cf. Lauer et al.
The lower isophotes in our PC image become "cuspy" at about 9" from the
center. This is presumably the bar or internal disk noted by Sandage & Bedke
Jan 3/4, 1981
103aO + GG385
The image seen in the overprinted main
print of NGC 1574 here is that of a prototypical
S0_1_(0). The very faint, outer extended envelope
(a disk seen face on) can be traced at least to the
distance of the bright star to the upper left of
NGC 1574. However, the galaxy is not an S0 but
has a bar (or a rudimentary disk) that emerges as
two opposite extensions from the central bulge,
shown in the insert enlarged to the same scale as
the main print. The non-barred classification as
S0 in the RC2, based on a Mount Stromlo 30-inch
plate, is inappropriate because of the
complication in the center.
The image has the three-zone structure
characteristic of S0 galaxies. The bar (or internal
disk), which extends from the bulge, ends where
the second (intermediate) zone terminates. This
internal pattern is similar to that of NGC 4262,
above. The vast external, low-surface-brightness
envelope that exists in NGC 1574 surrounds
these two intermediate zones.
There is a suggestion of globular clusters in
the extended halo. This is plausible because the
distance, based on the redshift of v_o = 701 km/s,
is small at D = 14 Mpc (m - M = 30.7).
The galaxy is close to the Dorado Group
(Ferguson and Sandage 1990) but is outside the
catalog area there.
Overexposed center, bright extended lens, star superposed 1.0 south-
following. Low surface brightness dwarf 10' south-following-following.
=ESO 157- G 22
There is a star 0.35 arcmin south-following the nucleus
and a bright star 1.2 arcmin south-following the nucleus.
Very bright nucleus
in a small lens
with a large faint envelope.
There is a star 0.35 arcmin [south-following] the nucleus, and
a bright star 1.2 arcmin [south-following] nucleus.