Congratulations to graduate student Brandon Radzom on the publication of his research on extragalactic X-ray sources discovered with the Chandra X-Ray Telescope. Brandon and his coworkers used optical spectra from the 10-m Keck telescopes, supplemented with photometric redshifts, to get distances to and classify the X-ray sources in the Hawaii Survey Field SSA22. They went on to determine hard X-ray luminosity functions for the active galactic nuclei (AGN) in the sample and compared AGN with broad line regions to AGN without over a redshift range 0.25 < z < 4. They find that broad-line AGN become increasingly dominant at higher redshift and at higher X-ray luminosity.
The full paper can be found online at https://iopscience.iop.org/article/10.3847/1538-4357/ac9bfe.
The College of Arts