On the Origin of the 511 keV Emission in the Galactic Centre Export

@article{citeulike:3438733, abstract = {Diffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution maps of this emission produced by the SPI instrument on INTEGRAL suggest at least one component of the emission is spatially coincident with the distribution of \~{}70 luminous, low-mass X-ray binaries detected in the soft gamma-ray band. The X-ray band, however, is generally a more sensitive probe of X-ray binary populations. Recent X-ray surveys of the Galactic Centre have discovered a much larger population (\>4000) of faint, hard X-ray point sources. We investigate the possibility that the positrons observed in the direction of the Galactic Centre originate in pair-dominated jets generated by this population of fainter accretion-powered X-ray binaries. We also consider briefly whether such sources could account for unexplained diffuse emission associated with the Galactic Centre in the microwave (the WMAP `haze') and at other wavelengths. Finally, we point out several unresolved problems in associating Galactic Centre 511 keV emission with the brightest X-ray binaries.}, archivePrefix = {arXiv}, author = {Bandyopadhyay, Reba M. and Silk, Joseph and Taylor, James E. and Maccarone, Thomas J.}, citeulike-article-id = {3438733}, citeulike-linkout-0 = {http://arxiv.org/abs/0810.3674}, citeulike-linkout-1 = {http://arxiv.org/pdf/0810.3674}, day = {20}, eprint = {0810.3674}, keywords = {511kev, galactic-center}, month = {Oct}, posted-at = {2008-10-22 08:54:40}, priority = {2}, title = {On the Origin of the 511 keV Emission in the Galactic Centre}, url = {http://arxiv.org/abs/0810.3674}, year = {2008} }

TY - JOUR ID - citeulike:3438733 L3 - citeulike-article-id:3438733 N2 - Diffuse 511 keV line emission, from the annihilation of cold positrons, has been observed in the direction of the Galactic Centre for more than 30 years. The latest high-resolution maps of this emission produced by the SPI instrument on INTEGRAL suggest at least one component of the emission is spatially coincident with the distribution of ~70 luminous, low-mass X-ray binaries detected in the soft gamma-ray band. The X-ray band, however, is generally a more sensitive probe of X-ray binary populations. Recent X-ray surveys of the Galactic Centre have discovered a much larger population (>4000) of faint, hard X-ray point sources. We investigate the possibility that the positrons observed in the direction of the Galactic Centre originate in pair-dominated jets generated by this population of fainter accretion-powered X-ray binaries. We also consider briefly whether such sources could account for unexplained diffuse emission associated with the Galactic Centre in the microwave (the WMAP `haze') and at other wavelengths. Finally, we point out several unresolved problems in associating Galactic Centre 511 keV emission with the brightest X-ray binaries. TI - On the Origin of the 511 keV Emission in the Galactic Centre KW - 511kev KW - galactic-center AU - Bandyopadhyay, Reba AU - Silk, Joseph AU - Taylor, James AU - Maccarone, Thomas PY - 2008/Oct/20/ UR - http://arxiv.org/abs/0810.3674 ER -