GW190412

Short description: Gravitational wave signal

GW 190412 was a gravitational wave (GW) signal observed by the LIGO and Virgo detectors on 12 April 2019.[1][2] In April 2020, it was announced as the first time a collision of a pair of very differently sized black holes has been detected.[3] As a result of this asymmetry, the signal included two measurable harmonics with frequencies approximately a factor 1.5 (a perfect fifth) apart.[2][4]

The collision took place 2.4 billion light-years away.[3] The heavier of the black holes had a mass of 30.1+4.6
−5.3 M☉, and the lighter one around 8.3+1.6
−0.9 M☉.[3] The difference in mass meant that the secondary harmonic in the signal was strong enough to be detected, allowing researchers to perform a test of general relativity and determine that the larger black hole was spinning.[3]

## See also

* Gravitational-wave astronomy
* List of gravitational wave observations

## References

1. ↑ "Superevent info - S190412m". LIGO. https://gracedb.ligo.org/superevents/S190412m/view/.
2. ↑ 2.0 2.1 The LIGO Scientific Collaboration; the Virgo Collaboration; Abbott, R.; Abbott, T. D.; Abraham, S.; Acernese, F.; Ackley, K.; Adams, C. et al. (17 April 2020). "GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses". Physical Review D 102 (4). doi:10.1103/PhysRevD.102.043015. Bibcode: 2020PhRvD.102d3015A.
3. ↑ 3.0 3.1 3.2 3.3 Starr, Michelle. "Astronomers Find First-Ever Collision of Black Holes With a Strange Mass Discrepancy" (in en-gb). ScienceAlert. https://www.sciencealert.com/this-black-hole-collision-is-the-first-with-wildly-mismatched-masses.
4. ↑ Berry, Christopher (18 April 2020). "GW190412—A new flavour of binary black hole" (in en). https://cplberry.com/2020/04/18/gw190412/.

## External links

* GW190412: Binary Black Hole Merger (with spin) on YouTube

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Gravitational-wave astronomy

* Gravitational wave
* Gravitational-wave observatory

Detectors|

| Resonant mass
antennas|

| Active|

* NAUTILUS (IGEC)
* AURIGA (International Gravitational Event Collaboration

|

Past|

* EXPLORER (IGEC)
* ALLEGRO (IGEC)
* NIOBE (IGEC)
* Stanford gravitational wave detector
* ALTAIR
* GEOGRAV
* AGATA
* Weber bar

Proposed|

* TOBA

Past proposals|

* GRAIL (downsized to MiniGRAIL)
* TIGA
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Ground-based
Interferometers|

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* AIGO (ACIGA)
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Past|

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Planned|

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Proposed|

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Past proposals|

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Space-based
interferometers|

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Proposed|

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Pulsar timing arrays|

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Data analysis|

* Einstein@Home
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Observations|

| Events|

* List of observations
* First observation (GW150914)
* GW151012
* GW151226
* GW170104
* GW170608
* GW170729
* GW170809
* GW170814
* GW170817 (first neutron star merger)
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Methods|

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* General relativity
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* Polarization
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* Stochastic
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* Category:2018 in space — Category:2019 in space — Category:2020 in space

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