In article ,
writes:

Doesn't look like dust is blocking view to center, if it is, the
dust is extraordinarily smooth.

It looks like it ran right through the center of the adjacent galaxy,
and lost it's black hole to the larger galaxy, with the stars
continuing on, blowing out into a spherical shell that has the
appearance of a circle.

But sorting out what is really going on would be a challenge. I'll
have to read some of those papers. But it really looks like it's
a galaxy without a central massive BH............and that's unusual
if so. Wonder if one of the papers shows spectroscopy of the central
region, I'll have to check.

Even though most galaxies probably contain central supermassive black
holes, they are not always active. Even if they are, radiation can be
directed in some direction other than towards us and/or can be obscured
by dust. There is no way you can tell just by looking at an SDSS image.
There are probably many images of this galaxy in much higher resolution.
(The interesting thing about SDSS is not its resolution or depth,
neither of which are particularly good (it is a small telescope at a
site which is much worse than the best, exposures are not particularly
long), but rather the fact that it images a large area of the sky and
does so in survey mode, rather than with targeted observations (which
allow one to study only objects which are already known).)