transient x-ray source

transient x-ray source

[′tranch·ənt ′eks‚rā ‚sȯrs]
(astronomy)
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10, 2010, the European Space Agency's INTEGRAL satellite detected a transient X-ray source in the direction of Terzan 5, a globular star cluster about 25,000 light-years away toward the constellation Sagittarius.
Draine and Woods say transient X-ray sources could provide the radiation necessary to heat and ionize gas, thereby exciting hydrogen atoms, which would then emit the ultraviolet light.