编辑“︁GW190521”︁（章节）

== 可能相關的電磁活動 ==
2020年6月，天文學家報告一道閃光可能與GW190521有關係，{{link-en|茲威基瞬變設施|Zwicky Transient Facility}}（{{lang|en|ZTF}}）報告發現觸發GW190521g附近的瞬變光源，但由於在數百平方度外發生，組織仍對此不確定，若黑洞合併與此有關，會是首個黑洞合併與[[電磁輻射]]有關的發現<ref name="NASA-20200625" /><ref name="PRL-20200625">{{cite journal | language=en | author=Graham, M.J. | display-authors=et al. | url=https://authors.library.caltech.edu/104019/1/PhysRevLett.124.251102.pdf | title=Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational-Wave Event S190521g | journal=Physical Review Letters | year=2020 | volume=124 | issue=25 | page=251102 | doi=10.1103/PhysRevLett.124.251102 | pmid=32639755 | arxiv=2006.14122 | bibcode=2020PhRvL.124y1102G | access-date= | archive-date=2020-07-11 | archive-url=https://web.archive.org/web/20200711111646/https://authors.library.caltech.edu/104019/1/PhysRevLett.124.251102.pdf | dead-url=no }}</ref><ref name="NYT-20200625" /><ref name="SD-20200626">{{cite news | language=en | title=Black hole collision may have exploded with light | url=https://www.spacedaily.com/reports/Black_hole_collision_may_have_exploded_with_light_999.html | date=2020-06-26 | work=ScienceDaily | accessdate= | archive-date=2020-06-26 | archive-url=https://web.archive.org/web/20200626151648/https://www.spacedaily.com/reports/Black_hole_collision_may_have_exploded_with_light_999.html | dead-url=no }}</ref>。黑洞合併正常來說不會發光，研究人員認為若黑洞合併發生在穿過一條不相關但相近超大質量黑洞[[吸積盤]]的軌道，影響吸積盤材質和光的產生，新合併後的黑洞可能以每秒200公里的速度穿越吸積盤。<ref name="IFLS-20200625" />若這個解釋正確，閃光會在約1.6年後，當黑洞再次遇到吸積盤時，再次出現。<ref name="PRL-20200625" /><ref name="IFLS-20200625" />

研究的首席天文學家馬修·格雷厄姆（{{lang|en|Matthew Graham}}）指，超大質量黑洞在多年來已有活動，這次突然的閃光發生的時間和位置都與引力波事件吻合，研究亦認為閃光很可能與黑洞合併有關，但不能排除其他可能性。<ref name="IFLS-20200625">{{cite news | language=en | last=Carpineti | first=Alfredo | title=Astronomers May Have Observed The First Flare From A Black Hole Collision | url=https://www.iflscience.com/space/astronomers-may-have-observed-the-first-flare-from-a-black-hole-collision/ | date=2020-06-25 | work=IFLScience | accessdate= | archive-date=2020-06-29 | archive-url=https://web.archive.org/web/20200629155728/https://www.iflscience.com/space/astronomers-may-have-observed-the-first-flare-from-a-black-hole-collision/ | dead-url=no }}</ref>