歪んだ不均一なジェットによって説明されるブラザーのスペクトル変動
C M Raiteri1, M Villata1, J A Acosta-Pulido2,3
1INAF, Osservatorio Astrofisico di Torino, I-10025 Pino Torinese, Italy.
Nature
|December 7, 2017
まとめ
CTA 102の2016-2017年のイベントのような極端な爆発を含むブラザーの変動は,不均質で曲がったジェットが時間とともに方向を変えることで説明され,相対論的ビーム理論を検証します.
科学分野:
- 天体物理学と宇宙学
- 高エネルギー天体物理学
背景:
- プラザは地球に向けられた相対論的ジェットによって 強力な放射を放つ 活発な銀河の核です
- ブレーザーの変動はドップラー放射によるもので,その背後にあるメカニズムは議論の余地がある.
- 提案されたメカニズムには,粒子加速/冷却,衝撃,渦巻,または角度の変化などの幾何学的な効果が含まれます.
研究 の 目的:
- CTA 102で観測された長期フルスとスペクトルの変化の原因を調査する.
- 物理条件と幾何学的な解釈に焦点を当てて,ブラザー放射の競合するモデルをテストする.
主な方法:
- 長期間にわたって光からラジオの波長モニタリング.
- 流動とスペクトルの変動の長期的傾向の分析
- 観測データと理論的予測の比較,特に相対論的ビームとジェット幾何学に関連するもの.
主要な成果:
- 観測されたCTA 102の長期的変動は,時間とともに方向性が変化する不均質な曲線ジェットによって最もよく説明されます.
- 2016年から2017年の極度の光学爆発は,小さな視角を持つ放射領域と一致しました.
- ジェット方向の変化はドップラー因子を変化させ,観測された流量と変動時間スケールに影響を与えます.
結論:
- この研究は,ジェット方向の変化によって引き起こされる ブラザーの変動の幾何学的な解釈を支持している.
- これらの方向転換の原因として,磁気水力学的な不安定性やジェット回転が提案されている.
- この発見は,ブラザー放射における相対論的放射の理論をさらに検証するものです.
関連する概念動画
02:39Emission Spectra
76.8K
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.
76.8K
01:30Atomic Emission Spectroscopy: Interference
664
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,...
664
01:20Atomic Emission Spectroscopy: Overview
3.8K
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...
3.8K
01:21Schwarzschild Radius and Event Horizon
2.8K
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...
2.8K
01:26Divergence and Curl of Magnetic Field
4.1K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
4.1K
01:02Flame Photometry: Overview
1.6K
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
1.6K