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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Assaying DNA Damage in Hippocampal Neurons Using the Comet Assay
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彗星41P/タトル・ジャコビニ・クレサックの回転速度の急速な低下

Dennis Bodewits1, Tony L Farnham1, Michael S P Kelley1

  • 1Department of Astronomy, University of Maryland, College Park, Maryland 20742, USA.

Nature
|January 12, 2018
PubMed
まとめ
この要約は機械生成です。

彗星41P/タトル・ジャコビニ・クレサック (Tuttle-Giacobini-Kresák) の観測は,その回転が劇的に減速していることを明らかにした. 彗星が不安定な状態に近づいていることを示唆しています 彗星が不安定な状態に近づいていることを示唆しています

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科学分野:

  • * 惑星科学
  • * 彗星の動力学
  • * 天体物理学

背景:

  • * 彗星の放気は,彗星の核のスピン状態を変え,その進化と寿命に影響を与えるトルクを生成します.
  • * 急速な回転は,重心力による物質の強さを上回るため,核の断片化につながる可能性があります.
  • *減速するトルクはスピン状態を不安定化し,時間とともに方向転換と回転速度の増加につながる可能性があります.

研究 の 目的:

  • * 彗星41P/タトル・ジャコビニ・クレサクが地球に接近する時のスピンダイナミクスを調査する.
  • * 彗星核の回転速度の急速な変化を観測し,定量化する.
  • * 観測されたスピン状態の変化が彗星の進化と安定性に及ぼす影響を理解する.

主な方法:

  • 彗星41P/Tuttle-Giacobini-Kresákが2017年に接近した際の写真観測.
  • * 2ヶ月の間隔 (2017年3月~5月) にわたる見かけのローテーション期間の変化の分析
  • * 彗星からの放気トルクの文脈における観測された回転速度の変化の解釈

主要な成果:

  • * 彗星41P/タトル・ジャコビニ・クレサックは回転速度が著しく低下した.
  • * 表面的な回転期間は2ヶ月以内に20時間から46時間以上に増加しました.
  • * この観測されたスピンダウン率は,以前に測定された値より大きさの順序です.

結論:

  • * 観測された急速なスピンダウンは,並べられたガス放出からの異常な強力なトルクによって引き起こされた.
  • * 彗星41P/タトル・ジャコビニ・クレサックは明らかに進化段階にある.
  • * 原子核の回転が不安定になり,断片化や方向転換につながる可能性があります.