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マゲランの大雲までの距離は 1% 精度で
G Pietrzyński1,2, D Graczyk3,4,5, A Gallenne6,7
1Nicolaus Copernicus Astronomical Centre, Warsaw, Poland. pietrzyn@camk.edu.pl.
Nature
|March 15, 2019
まとめ
天文学者たちは 双星を食すことで グレート・マゲラン雲までの距離を 正確に測定しました この改善された校正は宇宙距離のスケールを改良し,ハッブル定数の決定を助けます.
科学分野:
- 宇宙学
- 天体物理学
- 星の天文学
背景:
- ハッブル定数を決定するには,正確な経験的測定が必要です.
- セフェイド周期-光度関係は,宇宙距離スケールの校正に不可欠です.
- グレート・マゲラン雲は,この校正のための重要なアンカーであり,伝統的にセフェイド変数を用いて研究されています.
研究 の 目的:
- 表面の明るさ-色関係校正の精度を向上させる.
- より正確な幾何学的な距離を 決定するために
- 宇宙距離スケールと ハッブル定数の測定の不確実性を減らすために
主な方法:
- 遅いタイプの星から成る 20のエクリプスバイナリシステムを利用した.
- 0.8%の精度で表面の明るさと色の関係を校正した.
- 大マゲラン雲の正確な距離を 測定した
主要な成果:
- 表面の明るさ-色関係校正で0.8%の精度を達成しました.
- 1%の精度で大マゲラン雲の幾何学的な距離を決定した.
- 最終距離は49.59 ± 0.09 (統計的) ± 0.54 (系統的) キロパーセックである.
結論:
- この新しい校正は,マゲランの大雲の距離測定の精度を大幅に高めています.
- この進歩は宇宙の距離を より正確に定着させました
- 精密宇宙学の時代にハッブル定数のより正確な決定に貢献します.
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