Einstein Cross Lens Hints at Complex Galaxy Growth

Astronomers have identified a rare Einstein Cross gravitational lens in the elliptical galaxy J1453g, enabling precise weighing of the lensing mass. The cross magnifies a distant quasar, revealing a central stellar population in a relatively young galaxy that resembles the Milky Way, challenging the idea that elliptical galaxies form rapidly with predominantly low-mass stars and suggesting a more complex formation history, possibly involving slower growth or past mergers. The findings, published in Nature Astronomy, imply galaxy evolution may be more dynamic than current models predict.