VCC 1938 (NGC 4638).The galaxy is visibly disky beyond a few arcsec. A thin,
edge-on stellar disk seems to be embedded in the outer, thick disk of the
galaxy. The latter does not extend all the way in, stopping at a distance of
about 4.5" from the center. There is a faint indication of two tightly wound
dust spiral arms extending from the disk, at a distance of 13" from the center,
although there is no feature associated with these structures in the color
image. The latter do show, however, an inner, red disk about 12" in radius.
There is no obvious dust absorption associated with this disk in the individual
images, and therefore this is probably a stellar feature. The color images also
indicate the presence of a compact nucleus. In the isophotal analysis, the
center seems to wander and was therefore held fixed. A fainter galaxy (possibly
a nucleated dwarf elliptical) is seen about 100" to the east, while a very red
object is present about 17" east of the nucleus.
VCC 1938. This S0 galaxy is 1.7' from the neighboring nucleated dE, VCC 1945. We
detect GCs in both galaxies, although there are many fewer associated with VCC
1945 as it is ~2.5 mag fainter.
This galaxy forms a pair with NGC 4635, with a separation of 1.5'.
The ellipticity changes from 0.1 to 0.5 up to 10" and decreases
beyond that. The b_4_ coefficient is positive up to the point at
which the ellipticity begins to decrease. This may be due to the
presence of an inner disk, the presence of which is also indicated by
the B-R and B-K' color and extinction maps.
Appear as one double system in CGCG with VCC 1945; here separated.
DVP list only the brighter galaxy, NGC 4638.
Pair with NGC 4635 at 1.5 arcmin (MCG identification reversed;
NGC 4638 = MCG +02-32-188)
Ap. J., 146, 28, 1966.
Observatory, 88, 239, 1968.
S0- (de Vaucouleurs)
b) = UGC 07881 at 1.7, 99
Very bright center.
Pair with NGC 4637 at 1.5 arcmin.
Lick 13 and Uppsala 21 dimensions are for the bright part only.
Bright spindle 0.7' long in p.a. 130^deg^; no spiral structure discernible.