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astro-ph2004★ 180 cited
Positron annihilation spectrum from the Galactic Center region observed by SPI/INTEGRAL
E. Churazov, R. Sunyaev, S. Sazonov +2
The electron-positron annihilation spectrum observed by SPI/INTEGRAL during deep Galactic Center region exposure is reported. The line energy (510.9540.075 keV) is consistent…
astro-ph2004★ 18 cited
A catalogue of absorption-line systems in QSO spectra
A. I. Ryabinkov, A. D. Kaminker, D. A. Varshalovich
We present a new catalog of absprption-line systems identified in the quasar spectra. It contains data on 821 QSOs and 8558 absorption systems comprizing 16139 absorption lines wit…