The Spectra and Variability of X-Ray Sources in a Deep Chandra Observation of the Galactic Center

摘要: We examine the X-ray spectra and variability of sample sources with LX ≈ 1031-1033 ergs s-1 identified within inner 9' Galaxy by Muno et al. Very few exhibit intraday or intermonth variations. find that point near Galactic center are very hard between 2-8 keV, even after accounting for absorption. When modeled as power laws, median photon index is Γ = 0.7, while when thermal plasma we can only obtain lower limits to temperature kT > 8 keV. The combined similarly hard, a 0.8. Strong line emission observed from low-ionization, He-like, H-like Fe, both in average brightest individual sources. ratios highly ionized Fe consistent equilibrium. This whether examined function count rate source hardness suggests may fact be due local absorption partially covers X-ray-emitting regions systems. suggest most these intermediate polars, which (1) often prominent lines, (2) rarely either flares on short timescales changes their mean flux long timescales, (3) numerous comparable luminosities Galaxy.