An observational preprint combines Hubble and Chandra archives to examine three magnified images of one distant galaxy. The lens model gives a total amplification of about 78. Its X-rays exceed what the authors expect from star formation alone, pointing to an active galactic nucleus in a low-mass host during an era of vigorous black-hole growth.
A foreground galaxy cluster has magnified a faint distant galaxy into three images, each coinciding with an X-ray source. Marko Mićić and colleagues combined Hubble Space Telescope imaging, Chandra X-ray Observatory archives and published gravitational-lensing models in a 7 October observational preprint. The study interprets the system as a low-mass galaxy hosting an active nucleus, with X-ray emission associated with matter feeding a black hole.[1]
The lens geometry gives a redshift of approximately 2.14 and a combined magnification of about 78. That places the source in an era of vigorous black-hole growth and vigorous formation of stars. Its brightness depends on both the original emission and the cluster’s magnification. After correcting for that magnification, the authors find more X-ray luminosity than star formation alone can explain within the other observational constraints.[1]
Only one Hubble band provides a reliable detection of the host galaxy. Its red colour could reflect an older stellar population or dust obscuring young stars, leaving a broad range of possible stellar masses. Intrinsic luminosity also carries uncertainties from the lens reconstruction and X-ray spectral fitting. The preprint does not declare completed peer review; follow-up observations could distinguish the host galaxy’s dust and stellar population more clearly.[1]
