AT 2021lwx

It was first identified in imagery obtained on 13 April 2021 by the Zwicky Transient Facility (ZTF) astronomical survey[3] and is believed to be due to the accretion of matter into a super massive black hole (SMBH) heavier than one hundred million solar masses (M☉).

[2][1][4] It has a redshift of z = 0.9945,[1] which would place it at a distance of about eight billion light-years from earth,[4] and is located in the constellation Vulpecula.

[2][1] Subrayan et al. originally interpreted it to be a tidal disruption event between an SMBH (~108 M☉) and a massive star (~14 M☉).

[2] Wiseman et al. disfavor this interpretation, and instead believe the most likely scenario is "the sudden accretion of a large amount of gas, potentially a giant molecular cloud"[1] (~1,000 M☉),[6] onto an SMBH (>108 M☉).

However, the theoretical limit for an accreting super massive black hole is 1 hundred million solar masses.