Can they be visualized by immunohistochemistry of brain sections, especially the subventricular zone of wistar rat pup during the postnatal day 15 or 30?
Yes, they can. For a bunch of exycellent literature on the topic check PubMed for Magdalena Götz and her work.
Generally, antibodies against BLBP, GLAST, RC1 & 2, sometimes nestin, vimentin and others will give you reliable signals, but may stain different subpopulations.