Black Holes began Heating Gas throughout Space Later than Cosmologists Thought: Study
A study conducted by the School of Physics and Astronomy at Tel Aviv University is one of the foremost findings that reveal how the universe originated. The Israeli researchers told that black holes might have taken more time to increase the temperature of the ancient universe than previously thought.
Earlier, it was considered that finding clues related to heating process was out of bounds. But, the new findings have revealed that the signs could now be detected. A few hundred million years after the Big Bang, two cosmic milestones took place in the universe i.e. hydrogen gas was heated and was also made transparent.
Study co-author Rennan Barkana, of Tel Aviv University, said, "Previously, it was thought that these two milestones are well separated in time, and thus in observational data as well".
The researchers said cosmic heating could act as a main source to provide better insight into the earliest black holes. Similar to today's stars, stars in the early universe often had companions and one of the two companion stars exploded to form a black hole. When one of these stars bursts, the new system is called X-ray binary (XRB), the energy is radiated in the X-ray spectra.
Apart from other systems that radiate X-rays, XRBs are the brightest and dominates the total cosmic intensity of X-rays.
It is considered that X-rays were responsible for heating up of hydrogen gas that filled space. The earlier assumptions revealed the early universe received heat from low-energy X-rays. But, the latest and improved models of XRBs uncover that high-energy X-rays were responsible for heating the universe.
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