Archival Chandra and XMM-Newton observations reveal two transient X-ray sources in NGC 4552 exceeding 10^39 erg/s, classifying them as new transient ULXs.
ChandraStudy of X‐Ray Point Sources in the Early‐Type Galaxy NGC 4552 (M89) , volume=
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Transient and Variable Ultra-luminous X-ray Sources in NGC 4552
Archival Chandra and XMM-Newton observations reveal two transient X-ray sources in NGC 4552 exceeding 10^39 erg/s, classifying them as new transient ULXs.