Related Experiment Video
Updated: Jul 12, 2026
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Summary
High-velocity pulsars may originate from primordial stars in galactic halos or extragalactic space. This neutron star population could explain gamma-ray bursts, suggesting most occur outside visible galaxies.
Area of Science:
- Astrophysics
- Cosmology
- Neutron Star Physics
Background:
- Pulsars are rapidly rotating neutron stars emitting beams of electromagnetic radiation.
- The origin and distribution of high-velocity pulsars remain incompletely understood.
- Gamma-ray bursts (GRBs) are intense, brief flashes of gamma rays, with their precise origins debated.
Purpose of the Study:
- To propose a novel origin for high-velocity pulsars.
- To link these pulsars to primordial (population III) stars.
- To offer an explanation for the observed distribution of gamma-ray bursters.
Main Methods:
- Theoretical modeling of stellar evolution and pulsar formation.
- Analysis of astrophysical environments, including galactic halos and extragalactic space.
- Comparison of theoretical predictions with observational data on pulsars and gamma-ray bursts.
Main Results:
- High-velocity pulsars are proposed to form from population III stars in extended galactic halos or extragalactic regions.
- This scenario suggests a significant population of neutron stars exists beyond the visible galactic disk.
- The model provides a potential explanation for gamma-ray bursts, locating most outside visible galaxies.
Conclusions:
- Primordial stars are a viable source for high-velocity pulsars.
- The distribution of these pulsars supports their origin in galactic halos and extragalactic space.
- This framework offers a compelling explanation for gamma-ray burst phenomena and their locations.
Related Concept Videos
01:10Detection of Black Holes
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...
01:21Schwarzschild Radius and Event Horizon
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 velocity with the...
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 velocity with the...
01:11Atomic Nuclei: Larmor Precession Frequency
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
01:27Halo Effect
The halo effect is a cognitive bias in which an individual's overall impression influences judgments about their specific traits. This psychological phenomenon leads people to associate positive characteristics with those they perceive as generally good and negative characteristics with those they view as bad. This effect is particularly influential in social perception, professional evaluations, and decision-making processes.The Psychological Basis of the Halo EffectThe halo effect is rooted...
01:20Momentum And Radiation Pressure
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
01:14Gravitation Between Spherically Symmetric Masses
The gravitational potential energy between two spherically symmetric bodies can be calculated from the masses and the distance between the bodies, assuming that the center of mass is concentrated at the respective centers of the bodies.