Stellar object - stellar object

Japanese: 恒星状天体 - こうせいじょうてんたい

Also known as quasars, quasars, and QSOs (short for quasi-stellar objects). There are stellar radio sources (QSSs) that emit radio waves, and stellar galaxies (QSGs) that barely emit radio waves. They look like stars on astrophotography plates, but they are not stars. When viewed in spectrograms, they show emission lines characteristic of gaseous objects, and these lines are significantly shifted toward the red side (the wavelength is extended). If this is interpreted as the Doppler effect, they are moving away at a speed of 10% to 90% of the speed of light, and if the proportional relationship between the speed and distance of a galaxy holds, they must be celestial objects 2 to 14 billion light years away. Considering this, stellar objects are more than 100 times brighter than galaxies (about 10 billion times brighter than the sun), and are much smaller in size than galaxies. They have been discovered since around 1963, and about 1,500 are known. Stellar objects are unusual celestial bodies that were never expected. Their essence is that they have at their center a supermassive black hole with a mass about 1 billion times that of the Sun, and when stars or gas are attracted to this black hole, the gravitational energy released is converted into the acceleration of radio waves and particles.
→ Related topicsRadio astronomy

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

クエーサー，準星，QSO（quasi-stellar objectの略）とも。電波を放射する恒星状電波源（QSS）と，電波をほとんど放射しない恒星状銀河（QSG）がある。天体写真乾板上で恒星のように見えるが恒星ではなく，スペクトル写真で見るとガス状天体特有の輝線が見られ，それが著しく赤い方へずれた（波長が伸びている）天体である。これをドップラー効果と解釈すれば，光速度の十数％〜90％もの速度で遠ざかっており，銀河の速度と距離の比例関係が成り立つならば20億〜140億光年遠方の天体ということになる。これから考えると恒星状天体の明るさは銀河の100倍以上（太陽の約100億倍）あり，しかも大きさは銀河よりはるかに小さい。1963年ころから発見され，約1500個が知られている。恒星状天体は全く予想されなかった異常な天体で，その本質は，太陽の10億倍程度の質量の超大なブラックホールが中心にあり，恒星またはガスがこのブラックホールに引きつけられるときに解放される重力エネルギーが電波や粒子の加速に変換されるものと考えられる。
→関連項目電波天文学

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