GRB 050904のz = 6.39 +/- 0.12のフォトメトリック赤偏移は,GRB 050904のために
J B Haislip1, M C Nysewander, D E Reichart
1Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Campus Box 3255, Chapel Hill, North Carolina 27599, USA.
Nature
|March 10, 2006
まとめ
私たちは,赤道移転 z = 6.3 で,ガンマ線爆発 (GRB) の余光を発見しました.これらの宇宙イベントの記録です. この発見は,GRBが初期の宇宙を研究するための強力なツールであることを示しています.
科学分野:
- 宇宙の爆発と一時的な天文現象.
- 初期の宇宙の宇宙学と天体物理学.
背景:
- ガンマ線爆発 (GRB) は,例外的に明るい一時的な現象です.
- GRBとその後の輝きは,赤偏移 z ≈ 20まで観測可能であると予測されています.
- これらの出来事は,初期の宇宙の探査機としての可能性を秘めています.
研究 の 目的:
- GRB 050904.4の近赤外線後光を発見したことを報告するためです.
- 後照の観測を用いてGRB 050904の赤偏移を決定する.
- 初期の宇宙の探査機としてのGRBの有用性を評価する.
主な方法:
- GRB 050904.4の近赤外線後光の観測
- オプティカル・アフターグローの検出を試みました.
- フォトメトリックによる赤偏移の推定は,後光データに基づいています.
- 紅色偏移のスペクトロスコピク確認.
主要な成果:
- GRB 050904.4の明るい近赤外線後光を発見しました.
- フォトメトリック赤偏差はz = 6.39 - 0.12 + 0.11と決定されました.
- 光学赤偏移はz = 6.29 ± 0.01で確認され,光学推定値と一致しています.
- GRB 050904は,これまでに発見された最も遠いGRBの余光として特定されました.
結論:
- GRBは,初期の宇宙を調査するための貴重なツールとして確認されています.
- 観測されたGRBの余光は,恒星形成の歴史の追跡を可能にします.
- 初期の宇宙の金属性と再イオン化の歴史は,GRBを使って研究することができます.
さらに関連する動画
関連する概念動画
Emission Spectra
65.3K
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.
65.3K
Space-Time Curvature and the General Theory of Relativity
4.4K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
4.4K
IR Spectrometers
3.1K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
3.1K
IR Absorption Frequency: Delocalization
1.7K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
In IR...
1.7K
IR Frequency Region: X–H Stretching
1.5K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of 2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
1.5K
IR Spectrum Peak Intensity: Dipole Moment
1.8K
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
1.8K


