Positrons in Charge: e(+e^-) in Astrophysics

Details Positrons in Charge: e(+e^-) in Astrophysics Positrons in Charge: e(+e^-) in Astrophysics

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18711801p&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #118.01; Bulletin of the American Astronomical Society, Vol. 27, p.1450

Mathematics

Logic

1

Scientific paper

Positrons created by photon-photon collisions can be a source of both rest mass and opacity. They can become dominant in astrophysical systems where the energy densities are large and particles are accelerated to relativistic energies. Examples include accreting black holes and neutron stars, relativistic jets, pulsars, gamma-ray bursts and the cosmological universe. The X-ray and gamma-ray spectra of active galactic nuclei and X-ray transients are probably determined by pair creation in accretion disk coronae. Positron creation determines the rest mass flux, speed, and photon emission from relativistic jets in radio galaxies, blazars and Galactic black hole candidates such as GRO J1655-40. It also determines the efficiency of energy extraction from rotating black holes, which may be the energy sources for at least some of these jets. Positron creation in neutron star magnetospheres is crucial to the operation of pulsars. The mechanism of positron creation varies depending on the strength and topology of the pulsar magnetic field, and the spin period of the neutron star. Pair-creation on cosmological background radiations prevents energetic gamma-rays produced by cosmological sources from reaching earth. After reviewing these topics, we summarize some recent results on positron creation in black hole and pulsar magnetospheres, with applications to jets in radio galaxies and to the observability (death-line) of millisecond pulsars. We also describe a novel way to use cosmological gamma-ray sources to measure the intergalactic background radiation and (primordial?) intergalactic magnetic fields at high redshifts, in the range 10(-23) G

Affiliated with

Also associated with

No associations

Rating

Positrons in Charge: e(+e^-) in Astrophysics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Positrons in Charge: e(+e^-) in Astrophysics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positrons in Charge: e(+e^-) in Astrophysics will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1257041