  We investigate a sample of seven edge-on spiral galaxies using Chandra
observations. Edge-on spiral galaxies allow us to clearly separate source
associated with their star-forming regions versus the outer edges of the
system; offering a clear advantage over other systems. We uncover a number of
X-ray point sources across these galaxies, and after eliminating contaminating
foreground and background sources, we identify 12 candidate ultraluminous X-ray
sources. All of these sources are projected onto the central regions, implying
that the majority of ULXs in this sample of spiral galaxies are disk/bulge, and
thus not halo sources. This also includes two transient ULXs, which may be
long-duration transients and low mass X-ray binaries. This finding illustrates
the need for further studies of transient ULXs.
