マグネタールSGR 1900+14の周りの赤外線リング
S Wachter1, E Ramirez-Ruiz, V V Dwarkadas
1Spitzer Science Center, California Institute of Technology, Pasadena, California 91125, USA. wachter@ipac.caltech.edu
Nature
|May 30, 2008
まとめ
天文学者は,磁星SGR 1900+14の周りに赤外線環を発見しました. このリングは,磁星が巨大な恒星から発生し,巨大なフレアによって形成されるという理論を支持しています.
科学分野:
- 天文学と天体物理学について
- 高エネルギー天体物理学 高エネルギー天体物理学
- 中性子星物理学 中性子星物理学
背景:
- マグネタは,電波パルサーとは異なり,非常に強い磁場を持つ中性子星です.
- 以前の研究では,磁星と巨大な祖先星との関連が示唆されていた.
- マグネタールと他の中性子星の間の進化的関係は不明である.
研究 の 目的:
- マグネタールSGR 1900+14.を囲む赤外線環の性質を調査する.
- 観測された環構造の起源と形成機構を決定する.
- マグネタールと巨大な恒星とのつながりを固めるため.
主な方法:
- マグネタールSGR 1900+14の赤外線画像を用いた観測.
- リングの形状,サイズ,エネルギー分析.
- 観測データと恒星の進化と磁気フレアの理論モデルを比較する.
主要な成果:
- マグネタール周りの円形赤外線環または殻の発見 SGR 1900+14.
- リングの特徴は,標準的な恒星の質量損失や超新星残骸の進化と矛盾しています.
- 1998年に発生した巨大な磁星フレアによって作られた塵のない空洞の理論モデルが,リングの寸法を正確に予測しています.
結論:
- 観測された赤外線リングは,磁星SGR 1900+14からの巨大なフレアの結果である可能性が高い.
- この発見は,SGR 1900+14が巨大な恒星群と関連していることを示す強力な証拠を提供します.
- この研究は,磁星と巨大な恒星の祖先の間のリンクを固める.
関連する概念動画
01:30Magnetism
7.6K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
7.6K
01:09Infrared (IR) Spectroscopy: Overview
4.3K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
Different compounds display unique properties due to their...
4.3K
01:10Detection of Black Holes
2.4K
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...
2.4K
01:19Magnetic Field Lines
5.1K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
5.1K
01:21Schwarzschild Radius and Event Horizon
2.4K
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...
2.4K
01:19IR Spectrum
1.7K
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
1.7K