On the origin of the positron annihilation radiation from the direction of the galactic center

Details On the origin of the positron annihilation radiation from the direction of the galactic center On the origin of the positron annihilation radiation from the direction of the galactic center

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aipc...83..148l&link_type=abstract

IN: The galactic center; Proceedings of the Workshop, Pasadena, CA, January 7, 8, 1982 (A83-40676 19-90). New York, American Ins

Astronomy and Astrophysics

Astronomy

42

Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, Positron Annihilation, Emission Spectra, Line Spectra, Spectral Line Width, Time Dependence

Scientific paper

Physical constraints on the possible configuration of the positron annihilation region observed at the galactic center with gamma ray instrumentation focused on 511 keV emission are discussed. The line width is less than 2.5 keV, implying that the positrons annihilate in a gas that features some ionization. The line width also limits velocities to less than 700 km/sec, while the line center indicated a bulk velocity along the line of sight of between -90 to 200 km/sec. Data from emissions less than 511 keV suggest a production of 511 keV photons/positron ratio of 0.65 to account for the continuum emission detected. The annihilation region requires a temperature of at least 50,000 K and an ionization fraction of at least 10 percent, a density near 100,000 H/cu cm, and a diameter less than 10 to the 18th cm. Relativitistic considerations support pair production around an accreting black hole or the collision of collimated photon beams as possible sources of the emissions.

Affiliated with

Also associated with

No associations

Rating

On the origin of the positron annihilation radiation from the direction of the galactic center 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 On the origin of the positron annihilation radiation from the direction of the galactic center, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the origin of the positron annihilation radiation from the direction of the galactic center will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1100193