来自马射线二进制星1FGL J1018.6-5856的周期性辐射
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
概括
天文学家使用费米大面积望远镜 (LAT) 发现了一颗罕见的马射线双星,1FGL J1018.6-5856. 这个系统这个系统这个系统
科学领域:
- 天体物理学 天体物理学
- 高能天体物理学 高能天体物理学
- 二元恒星系统是二元恒星系统.
背景情况:
- 马射线二进制星系很少见,尽管我们银河系有几十个的预测.
- 它们的辐射源于紧物体 (中子星或黑洞) 和它们的同伴之间的相互作用.
研究的目的:
- 为了识别和描述新的玛射线二进制星体.
- 为了研究天体1FGL J1018.6-5856.的性质.
主要方法:
- 利用费米大面积望远镜 (LAT) 的数据进行马射线观测.
- 识别并分析了可变的X射线,光学和无线电对应物.
主要成果:
- 1FGL J1018.6-5856在马射线强度和频谱中表现出周期性调制,周期为16.6天.
- 一个可变的X射线对应物与马射线发射同时达到峰值.
- 确定了一颗O6V () 恒星和一个调制无线电对应物.
结论:
- 1FGL J1018.6-5856被证实是一个马射线双星.
- 这个系统的探测意味着银河系中存在其他较弱的马射线二进制星.
相关概念视频
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...