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Emission Spectra02:39

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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
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関連する実験動画

Updated: Sep 4, 2025

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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遠くの矮星銀河における広範囲の紫外線放射

Anshuman Borgohain1, Kanak Saha2, Bruce Elmegreen3

  • 1Department of Physics, Tezpur University, Napaam, India. ayush.borgohain@gmail.com.

Nature
|July 21, 2022
PubMed
まとめ

アストロサット望遠鏡を使って 青いコンパクトの矮星銀河の 恒星形成を観察しました これは,外部の領域で進行中のガス蓄積と重力の不安定性を示唆しています.

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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関連する実験動画

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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科学分野:

  • 天文学と天体物理学
  • 銀河の形成 と 進化

背景:

  • ブルー・コンパクト・ダワーフ (BCD) 銀河は明るさが低く,金属が少なく,中央に集まって,星形成の塊がある.
  • BCD形成の観察は,高い赤偏移で暗く,小さなサイズのために困難です.
  • 中間赤偏移の観測は,BCDの初期の進化段階,特にガス蓄積の影響を受けた外部の領域の研究に不可欠です.

研究 の 目的:

  • 青い矮星銀河の形成過程を調査する
  • 中間の赤偏移で BCD の外部の星形成活動を分析する.

主な方法:

  • アストロサットの超紫外線画像望遠鏡を使用して,GOODS南部の11のBCDの観測.
  • 遠紫外線 (FUV) 放射の分析とハッブル宇宙望遠鏡からの光学データとの比較.
  • 本質的なFUV放射プロファイルを決定するための測定器の点差関数に対する補正.

主要な成果:

  • 赤色偏移0.1から0.24で11のBCDの外部領域で過剰な紫外線 (FUV) 放射が検出されました.
  • 本質的なFUVの放射プロファイルは,10のBCDの光学対称よりも大きなスケール長を示しています.
  • 外部円盤の重力不安定を示しています.

結論:

  • 宇宙的に収縮する円盤の星形成は,浅いFUVプロファイルによって示唆されています.
  • 外部のFUV円盤の重力不安定は,動的摩擦によって塊の内側への移動を促します.
  • BCDの外部地域は,ガス蓄積と内部ダイナミクスによって活発に進化しています.