First Measurement Reveals Direction of Black Hole Recoil After Merger
Astronomers have measured both the speed and 3‑D direction of a black‑hole recoil for the 2019 GW190412 merger, finding a natal kick over 50 km s⁻¹ according to the study. Read more: getnews.me/first-measurement-reveal... #blackhole #gw190412
The mass ratio of #GW190412 enables us to make a good inference of the spin of the larger black hole. Spin is an important tracer of black hole formation. Follow this thread for details of our investigations #BlackHoleWeek https://twitter.com/cplberry/status/1275243813284524033
Happy birthday to #GW190412, a gravitational-wave observation of a binary black hole with unequal masses! The ratio of the two masses is roughly equal to the ratio of filling in a regular Oreo to in a Mega Stuf Oreo https://cplberry.com/2020/04/18/gw190412/ #BlackHoleWeek
We have so far announced #GW190412, #GW190425, #GW190521 and #GW190814 from #GWTC2. This leaves a lot more. Most look like binary black holes (my favourite), but GW190426 (a low significance candidate) could be a neutron star–black hole binary?
The @LIGO & @ego_virgo paper on the discovery of #GW190412 has been published in @PhysRevD! journals.aps.org/prd/abstract/10.1103/Phy... #OpenAccess
Catch up on the science of this new flavour of binary black hole with my blog...
A well-written summary of the lopsided binary #GW190412 by @AstroStephen https://physics.aps.org/articles/v13/114 via @APSphysics (although we show that the hierarchical merger scenario is pretty unlikely in https://arxiv.org/abs/2005.00023 I love the description of the black...
PS Parameter estimation results and evidences from our #GW190412 study are available from https://doi.org/10.5281/zenodo.3900546 #OpenData
5/4
Using different priors for #GW190412 you can shift the spin around: it is possible to have a non-spinning primary (big) black hole. However, this doesn't fit the data as well. We get the best results when both black holes are spinning, and prefer it when the primary spins
2/4
#GW190412 gave us a good measurement of black hole spin, but do the results change with different prior assumptions? In https://arxiv.org/abs/2006.11293 @spacedontwait, @NUCIERA's Scotty Coughlin, @FlatironCCA's Katerina Chatziioannou, @sasomao & I investigate
🧵1/4
#GW190412 has one black hole much bigger than the other. Could this be evidence of a hierarchical merger, with the bigger one having been made from smaller black holes?
No. There's little evidence using @ChaseBKimball's analysis from https://arxiv.org/abs/2005.00023
So far @LIGO–@ego_virgo have announced 2 #GravitationalWave discoveries from their 3rd observing run
🔵 #GW190425 the heaviest binary neutron star ever found https://cplberry.com/2020/01/06/gw190425/
⚫️ #GW190412 the 1st binary black hole with unequal masses...
#GW190412—an unusual unequal mass binary black hole system discovered by @LIGO & @ego_virgo with a clear harmonic hum https://cplberry.com/2020/04/18/gw190412/
What's exceptional about #GW190412? It's mass ratio, this is the first time we've seen clearly unequal mass black holes, which also means good spin measurement and more!
My unofficial write-up features Oreos, music theory and a little bit of astrophysics...
Following careful analysis #S190412m has become #GW190412!
Paper: https://arxiv.org/abs/2004.08342
Data: https://doi.org/10.7935/20yv-ka61
Rating: 🍨🐦🎶🐦🥴
A perfect fifth is two musical notes with a frequency ratio of 3:2. For the first time we have detected a perfect fifth played by the inspiral of two black holes. #GW190412 is the latest gravitational-wave discovery from @LIGO and @ego_virgo https://cplberry.com/2020/04/18/gw190412/
