Most galaxies have a black hole at their center. This proves the existence of a black hole. But when gases are sucked into a black hole, they reach ultra-high temperatures and release a lot of energy, flashing brightly in the X-ray spectrum. Thus, we cannot observe black holes directly. Even light cannot escape its gravitational field, so a black hole itself doesn’t release light. Belsole, Service d'Astrophysique, CEA Saclay, France)Ī black hole is a celestial object that has very high density and a strong gravitational field. Two lines of radio-wave jets stretching left and below overlap with X-ray jets. (Bottom) X-ray jets, indicated in white, superimposed over a radio map of the galaxy. (Top Right) Image of a black hole with X-ray jets extracted from the top left photo. (Top Left) Virgo galaxy cluster observed by XMM-Newton. Brighter black holes can be observed in other wavelengths, such as optical light and infrared rays, so I think it is important to combine these in observations. In particular, darker black holes can only be found using X-rays. The areas around black holes have very high energy, so they can be observed very well with X-rays. Are X-rays suited to the observation of black holes? We need to see various aspects of the universe in various wavelengths, but I am personally interested in high-energy phenomena, so X-rays are perfect for me. A star emitting optical light is very beautiful, and it’s an important component of the universe as well, but to understand everything about the universe, we have to look at things apart from stars. X-rays provide us with a lot of information, and what is particularly interesting to me is that this includes information about most of the universe. This light can let us see various astronomical phenomena that can’t be seen with optical light – that’s the attraction for me. X-rays are light that is invisible to the human eye. (courtesy: NASA/CXC/MIT/F.K.Baganoff et al.) Red indicates low energy and blue indicates high energy. The gas spreading toward the top right and left from the center looks red. The center of the Milky Way galaxy viewed with X-rays.
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