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プロトステラ外流物体HH2からのX線を発見した
S H Pravdo1, E D Feigelson, G Garmire
1Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 306-438, 4800 Oak Grove Drive, Pasadena, California 91109, USA. spravdo@jpl.nasa.gov
Nature
|October 19, 2001
まとめ
天文学者は,ハービグ・ハロ (HH) の天体からのX線を検出し,これらの恒星形成領域の衝撃で加熱されたガスを確認しました. この発見は,HHオブジェクト形成のジェット誘発ショックモデルを支持する.
科学分野:
- 天体物理学 天体物理学
- 天文学 天文学
- 恒星の進化について
背景:
- Herbig-Haro (HH) オブジェクトは,恒星形成地域における光るガス凝縮物です.
- その物理的性質は議論されており,新生星のモデル,恒星風,衝撃で興奮したガスポケットなどがあります.
- ジェット誘発ショックモデルは,エネルギッシュなHHオブジェクトからのX線放射を予測します.
研究 の 目的:
- Herbig-HaroオブジェクトからのX線放射の存在を調査するために.
- ジェット誘発ショックモデルの予測をテストするために.
主な方法:
- ヘルビグ・ハロ天体HH2の観測,最も明るく,最も近い天体の一つ.
- X線放射レベルの分析と理論モデルとの比較.
主要な成果:
- Herbig-Haroオブジェクト HH2.2 からX線放射が検出されました.
- 検出されたX線レベルは,ジェット誘発ショックモデルの予測と一致しています.
- 放射は,物体の先端にある衝撃で加熱された物質から発生します.
結論:
- この発見は,ジェットによる衝撃モデルに強力な証拠を提供します.
- Herbig-Haroオブジェクトには,衝撃で加熱された物質が含まれており,その温度は約10^6Kです.
- この発見は,恒星形成の物理的過程についての理解をさらに深める.
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