Astrophysical implications of the binary black-hole merger GW150914

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dc.contributor.author Sengupta, Anand
dc.date.accessioned 2016-02-22T11:41:51Z
dc.date.available 2016-02-22T11:41:51Z
dc.date.issued 2016-02
dc.identifier.citation Sengupta, Anand et al., “Astrophysical implications of the binary black-hole merger GW150914”, The Astrophysical Journal Letters, DOI: 10.3847/2041-8205/818/2/L22, vol. 818, no. 2, Feb. 2016. en_US
dc.identifier.issn 2041-8205
dc.identifier.uri http://dx.doi.org/10.3847/2041-8205/818/2/L22
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/2117
dc.description.abstract The discovery of the gravitational-wave (GW) source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black hole (BH) systems that inspiral and merge within the age of the universe. Such BH mergers have been predicted in two main types of formation models, involving isolated binaries in galactic fields or dynamical interactions in young and old dense stellar environments. The measured masses robustly demonstrate that relatively "heavy" BHs ($\gtrsim 25$ ${M}_{\odot }$) can form in nature. This discovery implies relatively weak massive-star winds and thus the formation of GW150914 in an environment with a metallicity lower than about 1/2 of the solar value. The rate of binary-BH (BBH) mergers inferred from the observation of GW150914 is consistent with the higher end of rate predictions ($\gtrsim 1$ Gpc−3 yr−1) from both types of formation models. The low measured redshift ($z\simeq 0.1$) of GW150914 and the low inferred metallicity of the stellar progenitor imply either BBH formation in a low-mass galaxy in the local universe and a prompt merger, or formation at high redshift with a time delay between formation and merger of several Gyr. This discovery motivates further studies of binary-BH formation astrophysics. It also has implications for future detections and studies by Advanced LIGO and Advanced Virgo, and GW detectors in space. en_US
dc.description.statementofresponsibility by Anand et.al
dc.format.extent vol. 818, no. 2
dc.language.iso en_US en_US
dc.publisher IOP Science en_US
dc.subject Gravitational waves en_US
dc.subject Stars en_US
dc.subject Black holes en_US
dc.subject Massive en_US
dc.title Astrophysical implications of the binary black-hole merger GW150914 en_US
dc.type Article en_US
dc.relation.journal The Astrophysical Journal Letters


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