銀河とクエーザーの橋渡しをする 塵の多いコンパクトな物体
S Fujimoto1,2, G B Brammer3,4, D Watson3,4
1Cosmic Dawn Center (DAWN), Copenhagen, Denmark. fujimoto@nbi.ku.dk.
Nature
|April 14, 2022
まとめ
天文学者は初期の宇宙でユニークな物体である GNz7q を発見し,塵で覆われた星爆発段階の初期の超大質量ブラックホールを示し,クエーザーの進化の洞察を提供しました.
科学分野:
- 宇宙学と天体物理学
- 初期の宇宙のブラックホール形成
- 銀河の進化
背景:
- 初期の宇宙における 超大質量ブラックホールの形成は 重要な課題です
- ビッグバンから7億年後に 発光するクエサールが観測されました
- 模擬ではクエーザーは 塵で覆われた星爆発から 覆われない光の相へと進化します
研究 の 目的:
- 初期の宇宙における超大質量ブラックホールの形成と成長を調査する.
- 高赤偏移で変異するクエーザーを特定する.
- スターバースト銀河と 光るクエーサーの 進化のつながりを理解するために
主な方法:
- 紫外線コンパクト物体GNz7qの赤偏移7.1899の観測
- 深い高解像度画像と スリットレススペクトロスコーピー
- 塵の放射,星形成率,そしてX線の弱気分析.
主要な成果:
- GNz7qの発見 塵で覆われた星爆発銀河で 光る塵の放出がある
- GNz7q内の紫外線のコンパクトオブジェクトの識別
- GNz7qは非常に弱いX線放射を示し,新生ブラックホールまたはコンパクトな恒星形成領域を示唆しています.
結論:
- GNz7qは,未遮蔽の光るクエーザーの潜在的前身である.
- この発見はブラックホールとクエーザーの進化の宇宙学的シミュレーションと一致しています
- この発見は 超大質量ブラックホールの成長段階に関する 重要な観測証拠を提供します
関連する概念動画
01:21Schwarzschild Radius and Event Horizon
2.2K
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...
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...
2.2K
01:10Detection of Black Holes
2.3K
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...
2.3K
01:20Atomic Emission Spectroscopy: Overview
2.7K
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...
2.7K
01:30Atomic Emission Spectroscopy: Interference
302
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
302
01:51Lampbrush Chromosomes
8.1K
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
8.1K
01:14Gravitation Between Spherically Symmetric Masses
1.0K
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.
1.0K