ガンマ線バイナリ1FGL J1018.6-5856からの周期的な放射
Fermi LAT Collaboration1, M Ackermann, M Ajello
1W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|January 17, 2012
まとめ
天文学者はフェルミ大型望遠鏡 (LAT) を使って,珍しいガンマ線バイナリ"1FGL J1018.6-5856"を発見した. このシステム このシステム このシステム
科学分野:
- 天体物理学 天体物理学
- 高エネルギー天体物理学
- バイナリー・スター・システム バイナリー・スター・システム
背景:
- ガンマ線バイナリ星は,我々の銀河系で数十の予測にもかかわらず,希少です.
- その放射は,コンパクトな天体 (中性子星やブラックホール) とその同伴星との相互作用から発生する.
研究 の 目的:
- 新しいガンマ線バイナリを特定し,特徴づけること.
- 天体1FGL J1018.6-5856.の性質を調査するために
主な方法:
- フェルミ大型望遠鏡 (LAT) のデータをガンマ線観測に使用した.
- 変数X線,光線,無線の同位体を特定,分析した.
主要な成果:
- 1FGL J1018.6-5856は,16.6日周期で,ガンマ線の強度とスペクトルの周期的な変調を示しています.
- 変数X線対照は,ガンマ線放射と同時にピークに達した.
- O6V ((((f)) の星と,調節された無線の対称星が特定されました.
結論:
- 1FGL J1018.6-5856がガンマ線バイナリーであることが確認されました.
- このシステムの検出は,銀河系の中に,他の,より弱いガンマ線バイナリの存在を暗示しています.
関連する概念動画
02:39Emission 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.
01:20Atomic Emission Spectroscopy: Overview
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...
01:29Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
01:22Atomic Emission Spectroscopy: Instrumentation
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
01:30Atomic Emission Spectroscopy: Interference
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,...
01:02Flame Photometry: Overview
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...