@article{b474ba1bad7a4bc6b33eb0f8054e59ca,

title = "GW190814: Gravitational Waves from the Coalescence of a 23 Solar Mass Black Hole with a 2.6 Solar Mass Compact Object",

abstract = "We report the observation of a compact binary coalescence involving a 22.2-24.3 M o˙ black hole and a compact object with a mass of 2.50-2.67 M o˙ (all measurements quoted at the 90% credible level). The gravitational-wave signal, GW190814, was observed during LIGO's and Virgo's third observing run on 2019 August 14 at 21:10:39 UTC and has a signal-to-noise ratio of 25 in the three-detector network. The source was localized to 18.5 deg2 at a distance of 241 +41-41 Mpc; no electromagnetic counterpart has been confirmed to date. The source has the most unequal mass ratio yet measured with gravitational waves , 0.112+0.0090.008, , and its secondary component is either the lightest black hole or the heaviest neutron star ever discovered in a double compact-object system. The dimensionless spin of the primary black hole is tightly constrained to ≤0.07. Tests of general relativity reveal no measurable deviations from the theory, and its prediction of higher-multipole emission is confirmed at high confidence. We estimate a merger rate density of 1-23 Gpc-3 yr-1 for the new class of binary coalescence sources that GW190814 represents. Astrophysical models predict that binaries with mass ratios similar to this event can form through several channels, but are unlikely to have formed in globular clusters. However, the combination of mass ratio, component masses, and the inferred merger rate for this event challenges all current models of the formation and mass distribution of compact-object binaries.",

author = "{LIGO Scientific Collaboration and Virgo Collaborations} and R. Abbott and Abbott, {T. D.} and S. Abraham and F. Acernese and K. Ackley and C. Adams and Adhikari, {R. X.} and Adya, {V. B.} and C. Affeldt and M. Agathos and K. Agatsuma and N. Aggarwal and Aguiar, {O. D.} and A. Aich and L. Aiello and A. Ain and P. Ajith and S. Akcay and G. Allen and A. Allocca and Altin, {P. A.} and A. Amato and S. Anand and A. Ananyeva and Anderson, {S. B.} and Anderson, {W. G.} and Angelova, {S. V.} and S. Ansoldi and S. Antier and S. Appert and K. Arai and Araya, {M. C.} and Areeda, {J. S.} and {Ar ne}, M. and N. Arnaud and Aronson, {S. M.} and Arun, {K. G.} and Y. Asali and S. Ascenzi and G. Ashton and Aston, {S. M.} and P. Astone and F. Aubin and P. Aufmuth and K. Aultoneal and C. Austin and V. Avendano and S. Babak and P. Bacon and F. Badaracco and Bader, {M. K.M.} and S. Bae and Baer, {A. M.} and J. Baird and F. Baldaccini and G. Ballardin and Ballmer, {S. W.} and A. Bals and A. Balsamo and G. Baltus and S. Banagiri and D. Bankar and Bankar, {R. S.} and Barayoga, {J. C.} and C. Barbieri and Barish, {B. C.} and D. Barker and K. Barkett and P. Barneo and F. Barone and B. Barr and L. Barsotti and M. Barsuglia and D. Barta and J. Bartlett and I. Bartos and R. Bassiri and A. Basti and M. Bawaj and Bayley, {J. C.} and M. Bazzan and B. B{\'e}csy and M. Bejger and I. Belahcene and Bell, {A. S.} and D. Beniwal and Benjamin, {M. G.} and R. Benkel and Bentley, {J. D.} and F. Bergamin and Berger, {B. K.} and G. Bergmann and S. Bernuzzi and Berry, {C. P.L.} and D. Bersanetti and A. Bertolini and J. Betzwieser and R. Bhandare and Bhandari, {A. V.} and J. Bidler and E. Biggs and Bilenko, {I. A.} and G. Billingsley and R. Birney and O. Birnholtz and S. Biscans and M. Bischi and S. Biscoveanu and A. Bisht and G. Bissenbayeva and M. Bitossi and Bizouard, {M. A.} and Blackburn, {J. K.} and J. Blackman and Blair, {C. D.} and Blair, {D. G.} and Blair, {R. M.} and F. Bobba and N. Bode and M. Boer and Y. Boetzel and G. Bogaert and F. Bondu and E. Bonilla and R. Bonnand and P. Booker and Boom, {B. A.} and R. Bork and V. Boschi and S. Bose and V. Bossilkov and J. Bosveld and Y. Bouffanais and A. Bozzi and C. Bradaschia and Brady, {P. R.} and A. Bramley and M. Branchesi and Brau, {J. E.} and M. Breschi and T. Briant and Briggs, {J. H.} and F. Brighenti and A. Brillet and M. Brinkmann and R. Brito and P. Brockill and Brooks, {A. F.} and J. Brooks and Brown, {D. D.} and S. Brunett and G. Bruno and R. Bruntz and A. Buikema and T. Bulik and Bulten, {H. J.} and A. Buonanno and D. Buskulic and Byer, {R. L.} and M. Cabero and L. Cadonati and G. Cagnoli and C. Cahillane and Bustillo, {J. Calder{\'o}n} and Callaghan, {J. D.} and Callister, {T. A.} and E. Calloni and Camp, {J. B.} and M. Canepa and Cannon, {K. C.} and H. Cao and J. Cao and G. Carapella and F. Carbognani and S. Caride and Carney, {M. F.} and G. Carullo and Diaz, {J. Casanueva} and C. Casentini and J. Castaeda and S. Caudill and M. Cavagli and F. Cavalier and R. Cavalieri and G. Cella and P. Cerd{\'a}-Dur{\'a}n and E. Cesarini and O. Chaibi and K. Chakravarti and C. Chan and M. Chan and S. Chao and P. Charlton and Chase, {E. A.} and E. Chassande-Mottin and D. Chatterjee and M. Chaturvedi and K. Chatziioannou and Chen, {H. Y.} and X. Chen and Y. Chen and Cheng, {H. P.} and Cheong, {C. K.} and Chia, {H. Y.} and F. Chiadini and R. Chierici and A. Chincarini and A. Chiummo and G. Cho and Cho, {H. S.} and M. Cho and N. Christensen and Q. Chu and S. Chua and Chung, {K. W.} and S. Chung and G. Ciani and P. Ciecielag and M. Cie{\'s}lar and Ciobanu, {A. A.} and R. Ciolfi and F. Cipriano and A. Cirone and F. Clara and Clark, {J. A.} and P. Clearwater and S. Clesse and F. Cleva and E. Coccia and Cohadon, {P. F.} and D. Cohen and M. Colleoni and Collette, {C. G.} and C. Collins and M. Colpi and M. Constancio and L. Conti and Cooper, {S. J.} and P. Corban and Coward, {D. M.} and Danilishin, {S. L.} and J. Degallaix and L. Ju and J. Liu and McCann, {J. J.} and Page, {M. A.} and Slaven-Blair, {T. J.} and L. Wen and C. Zhao and Zhu, {X. J.}",

year = "2020",

month = jun,

day = "20",

doi = "10.3847/2041-8213/ab960f",

language = "English",

volume = "896",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing",

number = "2",

}