{"work":{"id":"8d20efab-bfb2-487d-84bc-96e580fda804","openalex_id":null,"doi":null,"arxiv_id":"1706.01812","raw_key":null,"title":"GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2","authors":null,"authors_text":"B","year":2017,"venue":"gr-qc","abstract":"We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10:11:58.6 UTC by the twin advanced detectors of the Laser Interferometer Gravitational-Wave Observatory during their second observing run, with a network signal-to-noise ratio of 13 and a false alarm rate less than 1 in 70,000 years. The inferred component black hole masses are $31.2^{+8.4}_{-6.0}\\,M_\\odot$ and $19.4^{+5.3}_{-5.9}\\,M_\\odot$ (at the 90% credible level). The black hole spins are best constrained through measurement of the effective inspiral spin parameter, a mass-weighted combination of the spin components perpendicular to the orbital plane, $\\chi_\\mathrm{eff} = -0.12^{+0.21}_{-0.30}.$ This result implies that spin configurations with both component spins positively aligned with the orbital angular momentum are disfavored. The source luminosity distance is $880^{+450}_{-390}~\\mathrm{Mpc}$ corresponding to a redshift of $z = 0.18^{+0.08}_{-0.07}$. We constrain the magnitude of modifications to the gravitational-wave dispersion relation and perform null tests of general relativity. Assuming that gravitons are dispersed in vacuum like massive particles, we bound the graviton mass to $m_g \\le 7.7 \\times 10^{-23}~\\mathrm{eV}/c^2$. In all cases, we find that GW170104 is consistent with general relativity.","external_url":"https://arxiv.org/abs/1706.01812","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-25T18:36:08.414551+00:00","pith_arxiv_id":"1706.01812","created_at":"2026-05-09T06:19:14.986081+00:00","updated_at":"2026-05-25T18:36:08.414551+00:00","title_quality_ok":true,"display_title":"GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2","render_title":"GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2"},"hub":{"state":{"work_id":"8d20efab-bfb2-487d-84bc-96e580fda804","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":20,"external_cited_by_count":null,"distinct_field_count":4,"first_pith_cited_at":"2019-03-11T17:43:43+00:00","last_pith_cited_at":"2026-05-14T17:59:55+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-05-28T04:38:10.220157+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":11},{"context_role":"method","n":1}],"polarity_counts":[{"context_polarity":"background","n":9},{"context_polarity":"support","n":1},{"context_polarity":"unclear","n":1},{"context_polarity":"use_method","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}