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関連する概念動画

The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
The Electromagnetic Spectrum01:24

The Electromagnetic Spectrum

Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
Detection of Black Holes01:10

Detection of Black Holes

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...
Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Emission Spectra02:39

Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

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.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...

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関連する実験動画

Updated: Jul 11, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

クエサール,ブラザール,ガンマ線など.

C D Dermer, R Schlickeiser

    Science (New York, N.Y.)
    |September 18, 1992
    PubMed
    まとめ

    コンプトン・ガンマ線天文台 (CGRO) は13の新しい銀河外ガンマ線源を発見し,そのほとんどはブラザーで,活発な銀河の核についての理解を広げました. これらの発見は,超大質量ブラックホールから発生した宇宙のエネルギー過程を明らかにしています.

    科学分野:

    • 高エネルギー天体物理学
    • 銀河系外天文学とは
    • 宇宙線物理学 宇宙線物理学

    背景:

    • 以前は,クエーサー3C 273だけが,100 MeV以上のガンマ放射線の銀河外源として知られていた.
    • コンプトン・ガンマ線天文台 (CGRO) に設置されたエネルギーガンマ線実験望遠鏡 (EGRET) は,ガンマ線空を調査するために打ち上げられました.

    研究 の 目的:

    • 高エネルギーガンマ放射線の銀河外源を特定し,特徴づけること.
    • これらの源の性質と,活性銀河核 (AGN) との関係について調査する.

    主な方法:

    • コンプトン・ガンマ線天文台 (CGRO) に搭載されたエネルギーガンマ線実験望遠鏡 (EGRET) のデータを活用したものです.
    • 銀河系外からのガンマ線放射を分析する.
    • ブラザーの性質を特定するために,ガンマ線発見を複数の波長観測 (ラジオ,光学) と関連付けます.

    主要な成果:

    • CGROの観測から1年足らずで13の新しい銀河外ガンマ線源が発見され,合計14個となった.
    • 確認されたすべての光源は,高い光学偏極化,変動性,平面スペクトルの無線放射を含むブラザーの特徴を示しています.
    • これらの源は,おそらく希少で,好意的に配列された無線銀河や相対論ジェットを持つクエザールである.

    さらに関連する動画

    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
    06:28

    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

    Published on: January 30, 2020

    Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
    06:16

    Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

    Published on: April 25, 2019

    関連する実験動画

    Last Updated: Jul 11, 2026

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
    09:38

    Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

    Published on: December 18, 2015

    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
    06:28

    Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

    Published on: January 30, 2020

    Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
    06:16

    Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

    Published on: April 25, 2019

    結論:

    • CGROのEGRET装置は,既知の銀河外ガンマ線源の数を大幅に増加させました.
    • ブレーザーは,私たちの銀河系を超えた高エネルギーガンマ線の支配的な源です.
    • ガンマ線観測は,AGNの中心的なエンジンと極端な天体物理学的プロセスに関する重要な洞察を提供します.