2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3723Chandra's high angular resolution can resolve emission from stellar X-ray binaries out of the diffuse X-ray emission from gaseous atmospheres within elliptical galaxies. Variations in the X-ray binary populations (per unit galaxian optical luminosity) are correlated with variations in the specific frequency of globular clusters in ellipticals. This indicates that X-ray binaries are largely formed in globular clusters, rather than being a primordial field population.4 LaTeX pages (newpasp.sty) with two embedded EPS figures; to appear in "The X-ray Universe at Sharp Focus", eds. S. Vrtilek, E. Schlegel and L. Kuhi, ASP Conference SeriesAstrophysicstext