Astronomers have recently discovered two high red-shifting red quasars using the Subaru telescope. A quasar is an extremely bright active galactic nucleus with a supermassive black hole with an accretion disk at its center. Some quasars are called red quasars because their smokey dust absorbs blue light and appears to darken.
Astronomers are keen to look for high-red-shifting quasars (redshifts above 5.0) because they are one of the brightest and most distant dense objects in the observable universe. The spectrum of high-redshift quasars can be used to estimate the mass of supermassive black holes and is a powerful tool for detecting the early universe.
Due to the lack of large samples of high redshift quasars, and the light emitted by high-red-shifting quasars at a more blurred wavelength in ultraviolet light, scientists have so far not found red-shifting red quasars exceeding 5.0.
The researchers analyzed the data and identified four candidate red quasars out of 93 high redshift quasars, including HSC J120505.09-000027.9 and Redshift 5.83 HSC J023858.09-031845.4.
The findings, published in the preprinted website arXiv.org, say it will help improve understanding of these rare objects.