About: Freeman law

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The Freeman law is a statement in astronomy which says that disk galaxies have the same surface brightness, Σ at the center. It was described in 1970 by Ken Freeman. More recently it has been argued that the Freeman law is an effect of selection bias. However, after accounting for selection effects, the Freeman law was confirmed in the year 2010 for a sample of 30000 Sloan Digital Sky Survey galaxy images. It can be used with the Tully–Fisher relation to determine the luminosity and therefore distance of an observed galaxy. The Freeman law is sometimes called the Fish-Freeman effect.

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  • The Freeman law is a statement in astronomy which says that disk galaxies have the same surface brightness, Σ at the center. It was described in 1970 by Ken Freeman. More recently it has been argued that the Freeman law is an effect of selection bias. However, after accounting for selection effects, the Freeman law was confirmed in the year 2010 for a sample of 30000 Sloan Digital Sky Survey galaxy images. It can be used with the Tully–Fisher relation to determine the luminosity and therefore distance of an observed galaxy. The Freeman law is sometimes called the Fish-Freeman effect. (en)
  • 프리먼 법칙(Freeman law)은 원반은하들의 중심에서의 표면밝기가 같다는 법칙이다. 1970년 이 벌표하였다. 프리먼 법칙은 2010년 의 은하 사진 30000개를 분석하여 사실로 확인되었으며, 툴리-피셔 관계와 연동하여 은하의 광도를 알아내고 결과적으로 은하까지의 거리를 도출해낼 수 있게 한다. 그러나 최근에는 프리먼 법칙이 선택편향의 효과일 뿐이라는 주장도 제기되고 있다. (ko)
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  • The Freeman law is a statement in astronomy which says that disk galaxies have the same surface brightness, Σ at the center. It was described in 1970 by Ken Freeman. More recently it has been argued that the Freeman law is an effect of selection bias. However, after accounting for selection effects, the Freeman law was confirmed in the year 2010 for a sample of 30000 Sloan Digital Sky Survey galaxy images. It can be used with the Tully–Fisher relation to determine the luminosity and therefore distance of an observed galaxy. The Freeman law is sometimes called the Fish-Freeman effect. (en)
  • 프리먼 법칙(Freeman law)은 원반은하들의 중심에서의 표면밝기가 같다는 법칙이다. 1970년 이 벌표하였다. 프리먼 법칙은 2010년 의 은하 사진 30000개를 분석하여 사실로 확인되었으며, 툴리-피셔 관계와 연동하여 은하의 광도를 알아내고 결과적으로 은하까지의 거리를 도출해낼 수 있게 한다. 그러나 최근에는 프리먼 법칙이 선택편향의 효과일 뿐이라는 주장도 제기되고 있다. (ko)
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  • Freeman law (en)
  • 프리먼 법칙 (ko)
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