Cassiopeia A - Cassiopeia A

Japanese: カシオペヤ座A - カシオペヤざエー(英語表記)Cassiopeia A
Cassiopeia A - Cassiopeia A
The first radio source discovered in the constellation Cassiopeia. In the meter to centimeter wave range, where observations are often made in the field of radio astronomy, it is the strongest radio source in the entire sky, and is therefore used as a standard source of radio intensity and a standard for antenna gain calibration. Although there are no historical records, it is the remnant of a supernova that exploded about 300 years ago, and the radio source spreads out in a ring shape with a visual diameter of about 4 arcminutes, indicating that the radio source has a shell structure. Optical observations also show that nebula-like material is distributed along the distribution of the radio source.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
カシオペヤ座で発見された第1番目の電波源。電波天文学の分野でよく観測の行われるメートル波からセンチメートル波の領域では,全天でもっとも強い電波源であるので電波強度の標準源,アンテナ利得較正の標準などに使われる。歴史には記録が残っていないが,今から300年程度前に爆発した超新星の残骸で,電波源は視直径約4分角の環状に広がっていて,電波源が殻構造をもつことを示している。光による観測でも,電波源の分布に沿って星雲状物質が分布しているのがわかる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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