天文学と極紫外線探査衛星 エクスプローラー
1Center for EUV Astrophysics, University of California, Berkeley 94720, USA.
まとめ
超紫外線 (EUV) 波帯は,星間介質の不透明性のために天文学の役に立たないと考えられていたが,今や遠い宇宙の源を明らかにしている. エクストリーム・ウルトラバイオレット・エクスプローラー (Extreme Ultraviolet Explorer) ミッションは,空を調査し,宇宙についての理解を広げることに成功した.
科学分野:
- 天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
- 天体物理学 天体物理学
- 宇宙探査 (宇宙探査) とは
背景:
- 極紫外線 (EUV) 波帯 (100~912アングストーム) は,歴史的に天文観測ではアクセスできないと考えられてきました.
- このアクセシビリティの欠如は,これらの波長で光を吸収する星間媒体の不透明性によるものと考えられた.
研究 の 目的:
- 天文調査のためのEUV波帯の可能性を調査する.
- 以前見過ごされていたEUVスペクトルを使って宇宙を探求する.
主な方法:
- 1992年6月に打ち上げられたEUE (Extreme Ultraviolet Explorer) 衛星からのデータを利用しています.
- 100~912アングストームの波長範囲内での空の調査を実施しました.
主要な成果:
- 恒星間介質は,密度とイオン化において有意な不均一性を表しており,太陽は低不透明領域に位置しています.
- EUEミッションは,銀河系外物体を含め,かなりの距離にある多様な天文学的源を検出しました.
- EUV帯域の研究は,宇宙の組成のより深い理解に積極的に貢献しています.
結論:
- EUVの波帯は,天文学研究にとって有効で貴重なスペクトルです.
- EUEミッションは,宇宙物体の発見と研究におけるEUV調査の有効性を実証しました.
- 進行中のEUVの研究は,宇宙に関する私たちの知識を大幅に前進させると約束しています.
関連する概念動画
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
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 electronic transitions. As a result...
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...
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...
UV–Vis Spectrometers
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Absorption of Radiation
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Field Application of Global Positioning System
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...


