Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942 Export

@article{citeulike:4537447, abstract = {A series of observations of the Galactic center have been performed by the hard X-ray and low-energy gamma-ray coded imaging telescope SIGMA, aboard the GRANAT space observatory, in March, April, September, and October 1990, in the energy range 35 keV-1.3 MeV. The emission of the close nucleus center region above 35 keV was found to be dominated up to 300 keV by the previously observed X-ray source 1E 1740.7 - 2942, situated about 48 arcmin away from the radio source Sgr A. During the October 13, 1990, observation, it was discovered that the source was exhibiting a remarkable feature in its emission spectrum (E is greater than 300 keV), which appears as a bump, reaching a maximum intensity around 500 keV, followed by an approximately 700-keV cutoff. In an observation performed the day after, this feature was absent, showing that the source had recovered its nominal state in a very short time.}, author = {{bouchet}, L. and {mandrou}, P. and {roques}, J. P. and {vedrenne}, G. and {cordier}, B. and {goldwurm}, A. and {lebrun}, F. and {paul}, J. and {sunyaev}, R. and {churazov}, E. and {gilfanov}, M. and {pavlinsky}, M. and {grebenev}, S. and {babalyan}, G. and {dekhanov}, I. and {khavenson}, N.}, citeulike-article-id = {4537447}, citeulike-linkout-0 = {http://dx.doi.org/10.1086/186237}, citeulike-linkout-1 = {http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1991ApJ...383L..45B}, doi = {10.1086/186237}, journal = {Astrophys. J. Lett.}, keywords = {bibtex, cited}, month = {December}, pages = {L45--L48}, posted-at = {2009-05-18 11:16:33}, priority = {2}, title = {{Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942}}, url = {http://dx.doi.org/10.1086/186237}, volume = {383}, year = {1991} }

TY - JOUR ID - citeulike:4537447 L3 - citeulike-article-id:4537447 N2 - A series of observations of the Galactic center have been performed by the hard X-ray and low-energy gamma-ray coded imaging telescope SIGMA, aboard the GRANAT space observatory, in March, April, September, and October 1990, in the energy range 35 keV-1.3 MeV. The emission of the close nucleus center region above 35 keV was found to be dominated up to 300 keV by the previously observed X-ray source 1E 1740.7 - 2942, situated about 48 arcmin away from the radio source Sgr A. During the October 13, 1990, observation, it was discovered that the source was exhibiting a remarkable feature in its emission spectrum (E is greater than 300 keV), which appears as a bump, reaching a maximum intensity around 500 keV, followed by an approximately 700-keV cutoff. In an observation performed the day after, this feature was absent, showing that the source had recovered its nominal state in a very short time. JF - Astrophys. J. Lett. EP - L48 TI - {Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942} VL - 383 SP - L45 KW - bibtex KW - cited AU - {bouchet}, L AU - {mandrou}, P AU - {roques}, JP AU - {vedrenne}, G AU - {cordier}, B AU - {goldwurm}, A AU - {lebrun}, F AU - {paul}, J AU - {sunyaev}, R AU - {churazov}, E AU - {gilfanov}, M AU - {pavlinsky}, M AU - {grebenev}, S AU - {babalyan}, G AU - {dekhanov}, I AU - {khavenson}, N PY - 1991/December// UR - http://dx.doi.org/10.1086/186237 ER -