Astronomers have discovered the brightest gravitational lens object ever seen. They do not expect to find many quasars lighter than…
Astronomers have discovered the brightest gravitational lens object ever seen. They do not expect to find many quasars lighter than in the entire observable universe. Quasar is driven by a supermassive black hole in the heart of a young galaxy in the process of forming. An enormous amount of energy is released because the black hole consumes material around it.
The quasar would have been undetected if not for the power of gravitational lensing, which increased the brightness by a factor of 50. Very distant quasars are identified by their red color (due to absorption of diffuse gas in intergalactic space), sometimes their light “contaminated” and looks blue because of the starlight in an intermediate galaxy. As a result, they can be overlooked in quasar searches because their color is diluted to resemble that of a normal galaxy. Fan suggests that many other distant quasars have been missed because of this light pollution.
This discovery gives clues on how to find more “phantom quasars”. We now know more about how to look for them with the confidence that they exist.
A theoretical study predicts that we lack a large number of “phantom quasars”. If the quas were more numerous, it would revolutionize our perception of what happened just after the storm.
Astrophysical journal – Discovery of a Gravitationally Lensed Quasar at z = 6.51
Strong gravity lens provides a powerful probe for the physical properties of quasars and their host galaxies. A high proportion of the most luminous high-redshift quasks were predicted to become lenses due to magnification bias. However, no multiple-formed quasars were found at z over 5 in previous studies. We report the discovery of J043947.08 + 163415.7, a highly leased quasar at z = 6.51, the first such object was detected at the epoxy for reionization and the brightest quasar still known at z above 5. Hubble Space Telescope imaging of high resolution reveals a multiple image system with a maximum image separation θ ~ 0farcs2, best explained by a model of three quasar images lined by a low brightness at z ~ 0.7, with a magnification factor of ~ 50. The presence of this source suggests that a significant population of strong Lined, scaled quasars could have been missed by previous investigations, as common color selection techniques would fail when the quasher color is contaminated by the lens galaxy.
Astrophysical magazine – Most leased quasars at z over 6 are missing from current surveys
The discovery of the first strongly lenses (μ ≈ 50) quasar at z over 6 (J0439 + 1634) represents a breakthrough in our understanding of the early universe. We derive the theoretical consequences of the new discovery. We predict that the observed population of z over 6 quasars should contain many sources with magnifications μ less than or equal to 10 and with image separations below the resolution threshold. In addition, current selection criteria may have missed a significant population of lenses z larger than 6 quasars, due to contamination of the outlet photometric bands of lens galaxies. We argue that this predicted population of lined z reater than 6 quasars would be unclassified and mixed with low-z-galaxies. We quantify the fraction of undetected quasars as a function of the slope of the light end of the quasi-luminosity function, p. For β less than or equal to 3.6, we predict that the undetected lenticular quasas could reach half of the population, while for greater than or equal to by 4.5, the large majority of z larger than 6 quasar population is lentilized and still undetected. This would significantly affect the z function greater than 6 quasars brightness and derived black hole dose distributions, with profound implications for ultraviolet x-ray and infrared cosmic background and the growth of early quasars.