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  Gravitational waves from Scorpius X-1: A comparison of search methods and prospects for detection with advanced detectors

Messenger, C., Bulten, H. J., Crowder, S. G., Dergachev, V., Galloway, D. K., Goetz, E., et al. (2015). Gravitational waves from Scorpius X-1: A comparison of search methods and prospects for detection with advanced detectors. Physical Review D, 92: 023006. doi:10.1103/PhysRevD.92.023006.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1D87-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1D8B-F
Genre: Journal Article

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 Creators:
Messenger, C., Author
Bulten, H. J., Author
Crowder, S. G., Author
Dergachev, V., Author
Galloway, D. K., Author
Goetz, E.1, Author              
Jonker, R. J. G., Author
Lasky, P. D., Author
Meadors, G. D.1, Author
Melatos, A., Author
Premachandra, S., Author
Riles, K., Author
Sammut, L., Author
Thrane, E. H., Author
Whelan, J. T.2, Author              
Zhang, Y., Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: The low-mass X-ray binary Scorpius X-1 (Sco X-1) is potentially the most luminous source of continuous gravitational-wave radiation for interferometers such as LIGO and Virgo. For low-mass X-ray binaries this radiation would be sustained by active accretion of matter from its binary companion. With the Advanced Detector Era fast approaching, work is underway to develop an array of robust tools for maximizing the science and detection potential of Sco X-1. We describe the plans and progress of a project designed to compare the numerous independent search algorithms currently available. We employ a mock-data challenge in which the search pipelines are tested for their relative proficiencies in parameter estimation, computational efficiency, robust- ness, and most importantly, search sensitivity. The mock-data challenge data contains an ensemble of 50 Scorpius X-1 (Sco X-1) type signals, simulated within a frequency band of 50-1500 Hz. Simulated detector noise was generated assuming the expected best strain sensitivity of Advanced LIGO and Advanced VIRGO ($4 \times 10^{-24}$ Hz$^{-1/2}$). A distribution of signal amplitudes was then chosen so as to allow a useful comparison of search methodologies. A factor of 2 in strain separates the quietest detected signal, at $6.8 \times 10^{-26}$ strain, from the torque-balance limit at a spin frequency of 300 Hz, although this limit could range from $1.2 \times 10^{-25}$ (25 Hz) to $2.2 \times 10^{-26}$ (750 Hz) depending on the unknown frequency of Sco X-1. With future improvements to the search algorithms and using advanced detector data, our expectations for probing below the theoretical torque-balance strain limit are optimistic.

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 Dates: 2015-04-222015
 Publication Status: Published in print
 Pages: 33 pages, 11 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1504.05889
DOI: 10.1103/PhysRevD.92.023006
URI: http://arxiv.org/abs/1504.05889
 Degree: -

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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 92 Sequence Number: 023006 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258