Video Experimental Relacionado
Updated: Jul 1, 2026
10:40
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
La espectroscopia con resolución de fase de Geminga muestra un punto caliente en rotación
P A Caraveo1, A De Luca, S Mereghetti
1Istituto di Astrofisica Spaziale e Fisica Cosmica, Consiglio Nazionale delle Ricerche, Via Bassini, 15-20133 Milano, Italy. pat@mi.iasf.cnr.it
Science (New York, N.Y.)
|July 17, 2004
Resumen
Las observaciones de rayos X revelan un punto caliente en el púlsar Geminga, que emite radiación térmica. Este hallazgo puede vincular al púlsar.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Astrofísica de alta energía Astrofísica de alta energía
Sus antecedentes:
- Las estrellas de neutrones aisladas emiten rayos X de emisiones no térmicas y térmicas de superficie.
- El púlsar Geminga es una estrella de neutrones bien estudiada.
Objetivo del estudio:
- Para analizar las observaciones de rayos X Multimirror Misión-Newton del púlsar Geminga.
- Para investigar la naturaleza de las emisiones de rayos X de la superficie del púlsar Geminga.
Principales métodos:
- Utilizó las observaciones de rayos X Multimirror de la Misión Newton.
- Se analizaron los datos espectrales del púlsar Geminga.
- Componentes de emisión térmica y no térmica investigados.
Principales resultados:
- Detectó un espectro de 43 eV de toda la superficie de la estrella de neutrones.
- Se observó un componente de ley de potencia por encima de 2 keV.
- Se identificó un punto caliente localizado (170 eV) en la superficie del púlsar, visible en intervalos de fase específicos.
Conclusiones:
- La emisión localizada de puntos calientes sugiere un calentamiento por partículas aceleradas magnetosféricas.
- Este hallazgo puede cerrar la brecha entre las emisiones de rayos X y rayos gamma de los púlsares.
- Los puntos calientes polares son una explicación plausible para la emisión térmica observada.
Videos de Conceptos Relacionados
01:09Infrared (IR) Spectroscopy: Overview
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...
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
01:24IR Spectroscopy: Molecular Vibration Overview
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
01:25IR Spectrometers
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...
01:20IR Spectrum Peak Intensity: Dipole Moment
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...