Citizen – Mohammed Daoud – Jeddah
The President of the Astronomical Society in Jeddah, Eng. Majed Abu Zahira, announced the discovery of a blazar with a variable appearance 6.3 billion light-years away, explaining that astronomers conducted a photometric and spectroscopic measurement of the blazar B2 1420 + 32, which includes a set of properties of variable appearance, and the results of the study were published in the Journal of Physics. astrological.
Changing appearance plazaar concept:
The engineer, Majed Abu Zahira, stated that blazars are strong active galactic nuclei with jets that extend distances on the scale of one million light-years, and affect the evolution of galaxies and galactic clusters in which they are located through radiation. These properties make blazars ideal environments for studying the physics of jets and their role in the evolution of galaxies.
The blazar and the understanding of the jets:
He said: The origin of these jets and the processes that drive the radiation are not well known and therefore, the study of blazars allows for a better understanding of these jets and how they relate to other components of the active galactic nucleus, such as the accretion disk around the black hole, as the new study investigated the evolution of blazar B2 1420 + 32, Which is 6.3 billion light-years away in the constellation Howl.
And he continued, this blazar showed a huge optical glow, at the end of 2017, a phenomenon captured by the All Sky Automated Survey of the SuperNovae Telescope Network (ASAS-SN), and this event was monitored by observing the evolution of the spectrum and light curve of the blazar over the next two years, as well as Retrieval of the archival data available for this object, and by reviewing data spanning over a decade some important results were achieved, significant spectrum diversity and multiple transitions between the two blazar subcategories were observed for the first time, giving it the name of the variable-looking blazar.
However, astronomers concluded that this behavior is the result of continuous flow changes; This confirms an old theory that divides blazars into two main classes. In addition, many very large multiband flares have been observed in the visible and gamma ray bands at different time scales and new spectral properties. This extreme contrast and spectral properties require dedicated searches for more of these blazars, which It will allow to take advantage of the observed spectral changes to reveal the physics of active galactic nuclei and jets, including how dust particles around supermassive black holes are destroyed by massive radiation from the center and how energy is transferred from the jet to dust clouds, providing new insight linking the evolution of the black hole. colossal host galaxy.
Free iron ions:
Abu Zahra concluded by saying, the study also showed the observation of the appearance of iron emission lines, which indicates that the nearby dust particles were evaporated by the strong radiation from the jet, and released free iron ions in the emitted clouds, a phenomenon predicted and confirmed by theoretical models.