en.wikipedia.org/wiki/Primordial_black_hole
2 corrections found
there have been no gravitational waves detected at z>1 (>6 Gya)
This is outdated. The official LIGO/Virgo/KAGRA catalog includes at least one confidently detected event with a best-fit redshift above 1.
Full reasoning
The claim says no gravitational waves have been detected at redshift z > 1. But the official Gravitational-Wave Transient Catalog (GWTC), maintained by the LIGO/Virgo/KAGRA collaboration through GWOSC, includes GW230704_212616 as a cataloged event, and its parameter-estimation pages report redshifts above 1 in multiple analyses.
On the event’s official GWOSC detail page, the default PE entry gives redshift 1.04 (+0.67 / -0.54), and reweighted analyses list 1.05, 1.06, 1.08, and 1.09 as best-fit values depending on waveform model. The GWTC catalog page also describes itself as containing confidently-detected events from LVK releases. That directly contradicts the statement that there have been no gravitational-wave detections at z > 1.
2 sources
- GW230704_212616 Detail Page
Default PE ... redshift 1.04 +0.67 -0.54 ... reweighted analyses list redshift 1.05, 1.06, 1.08, and 1.09 depending on waveform family.
- GWTC
The Gravitational-wave Transient Catalog (GWTC) is a cumulative set of gravitational wave transients maintained by the LIGO/Virgo/KAGRA collaboration. The online GWTC contains confidently-detected events from multiple data releases.
On 26 November 2023, evidence, for the first time, of an overmassive black hole galaxy
The date is incorrect. NASA and Chandra’s public announcement of the UHZ1 result was on November 6, 2023, not November 26, 2023.
Full reasoning
The article dates the first reported evidence connected with UHZ1 to 26 November 2023, but the official public announcements from both NASA and the Chandra X-ray Observatory are dated November 6, 2023.
Chandra’s UHZ1 page is explicitly titled "UHZ1 :: November 6, 2023" and lists the Release Date: November 6, 2023. NASA’s corresponding article, "NASA Telescopes Discover Record-Breaking Black Hole," is likewise dated Nov 06, 2023. So the date given in the post is off by 20 days.
2 sources
- Chandra :: Photo Album :: UHZ1 :: November 6, 2023
Fast Facts for (UHZ1) ... Release Date November 6, 2023.
- NASA Telescopes Discover Record-Breaking Black Hole - NASA
Lee Mohon Nov 06, 2023 ... By combining data from NASA's Chandra X-ray Observatory and NASA's James Webb Space Telescope, a team of researchers was able to find the telltale signature of a growing black hole just 470 million years after the big bang.