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グリーン・バンク望遠鏡を用いて,テルザン5で21ミリ秒パルサーを観測した
Scott M Ransom1, Jason W T Hessels, Ingrid H Stairs
1National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA. sransom@nrao.edu
Science (New York, N.Y.)
|January 18, 2005
まとめ
天文学者はグリーンバンク望遠鏡を使用して球状星群テルザン5で21ミリ秒パルサー (MSP) を発見しました. これらの発見は,恒星の進化の理論を支持し,巨大な中性子星を明らかにし,極端な密度の物質に関する私たちの理解に影響を与えます.
科学分野:
- 天文学と天体物理学について
- コンパクトなオブジェクト コンパクトなオブジェクト
- 中性子星物理学 中性子星物理学
背景:
- 球状星団は,多様な星群を宿している密度の高い恒星系である.
- ミリ秒パルサー (MSP) は,恒星の進化と一般相対性理論の理論をテストするために不可欠な,急速に回転する中性子星です.
研究 の 目的:
- 球状星群テルザン5内のミリ秒パルサーを特定し,特徴づけること.
- 中性子星の性質を制約するMSPを含む二進体の性質を調査する.
主な方法:
- グリーンバンク望遠鏡を使って,テルザン5の無線観測を行った.
- ミリ秒パルサー信号を検知し,確認するためにタイミングデータを分析した.
- 相対論的効果を含むバイナリMSPの軌道パラメータを研究した.
主要な成果:
- テルザン5で21個の新しいミリ秒パルサーを発見し,合計24個に増加しました.
- 発見された新しいMSPのうち13は二重星系にあり,2つは日食,2つは離心軌道を示しています.
- 2つのシステムで相対論的周辺星の前進を測定し,中性子星の質量が1.68太陽質量を超えることを示しました.
結論:
- この発見は,球状星団と二重星系進化のモデルを検証している.
- 高質量の中性子星は,超核密度の物質の状態方程式に異議を唱える.
- これらの発見は,核物理学と天体物理学にとって重要なデータを提供します.
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