Archival Multiband Gravitational-Wave Signals from Massive Black Hole Binary Mergers
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911616462749696 |
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| author | Criswell, Alexander W. Taylor, Stephen R. Pardo, Kris Sesana, Alberto Izquierdo, David Bonoli, Silvia Spinoso, Daniele |
| author_facet | Criswell, Alexander W. Taylor, Stephen R. Pardo, Kris Sesana, Alberto Izquierdo, David Bonoli, Silvia Spinoso, Daniele |
| contents | While massive black hole binaries (MBHBs) merge at gravitational-wave frequencies above the pulsar timing array (PTA) sensitivity band, we show that they leave orphaned low-frequency contributions in the PTA pulsar term. Due to the light-propagation time between each pulsar in the array and Earth, the pulsar term acts as a time-delayed probe of a chirping merger with a specific frequency response determined by the direction of origin and intrinsic properties of the MBHB. We provide a detailed consideration of how such a multiband signal would manifest in a full PTA, demonstrate an approach to stack these orphaned pulsar terms across the array, and discuss prospects for an archival, multiband search in conjunction with MBHB mergers observed in astrometric data or spaceborne interferometers like LISA. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_21013 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Archival Multiband Gravitational-Wave Signals from Massive Black Hole Binary Mergers Criswell, Alexander W. Taylor, Stephen R. Pardo, Kris Sesana, Alberto Izquierdo, David Bonoli, Silvia Spinoso, Daniele High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology While massive black hole binaries (MBHBs) merge at gravitational-wave frequencies above the pulsar timing array (PTA) sensitivity band, we show that they leave orphaned low-frequency contributions in the PTA pulsar term. Due to the light-propagation time between each pulsar in the array and Earth, the pulsar term acts as a time-delayed probe of a chirping merger with a specific frequency response determined by the direction of origin and intrinsic properties of the MBHB. We provide a detailed consideration of how such a multiband signal would manifest in a full PTA, demonstrate an approach to stack these orphaned pulsar terms across the array, and discuss prospects for an archival, multiband search in conjunction with MBHB mergers observed in astrometric data or spaceborne interferometers like LISA. |
| title | Archival Multiband Gravitational-Wave Signals from Massive Black Hole Binary Mergers |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.21013 |