Unusual flaring activity observed from the ultraluminous X-ray source NGC 4559 X7

Unusual flaring activity observed from the ultraluminous X-ray source NGC 4559 X7
Italian astronomers have performed X-ray observations of an ultraluminous X-ray source (ULX) known as NGC 4559 X7 and found that this source exhibits unusual flaring activity. The finding is reported in a paper published March 26 on the arXiv pre-print repository.
phys.org
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