Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Medientyp: Sonstige Veröffentlichung; E-Artikel
Titel: Directed search for gravitational waves from Scorpius X-1 with initial LIGO data
Beteiligte: Aasi, J. [VerfasserIn]; Abbott, B.P. [VerfasserIn]; Abbott, R. [VerfasserIn]; Abbott, T. [VerfasserIn]; Abernathy, M.R. [VerfasserIn]; Acernese, F. [VerfasserIn]; Ackley, K. [VerfasserIn]; Adams, C. [VerfasserIn]; Adams, T. [VerfasserIn]; Addesso, P. [VerfasserIn]; Adhikari, R.X. [VerfasserIn]; Adya, V. [VerfasserIn]; Affeldt, C. [VerfasserIn]; Agathos, M. [VerfasserIn]; Agatsuma, K. [VerfasserIn]; Aggarwal, N. [VerfasserIn]; Aguiar, O.D. [VerfasserIn]; Ain, A. [VerfasserIn]; Ajith, P. [VerfasserIn]; Alemic, A. [VerfasserIn]; Allen, B. [VerfasserIn]; Allocca, A. [VerfasserIn]; Amariutei, D. [VerfasserIn]; Anderson, S.B. [VerfasserIn]; [...]
Erschienen: College Park, MD : American Physical Society, 2015
Erschienen in: Physical Review D - Particles, Fields, Gravitation and Cosmology 91 (2015), Nr. 6 ; Physical Review D - Particles, Fields, Gravitation and Cosmology
Ausgabe: published Version
Sprache: Englisch
DOI: https://doi.org/10.15488/12044; https://doi.org/10.1103/PhysRevD.91.062008
ISSN: 1550-7998
Schlagwörter: emission ; pulsars ; neutron-stars ; magnetically confined mountain ; radiation ; period ; maximum spin frequency
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Beschreibung: We present results of a search for continuously emitted gravitational radiation, directed at the brightest low-mass x-ray binary, Scorpius X-1. Our semicoherent analysis covers 10 days of LIGO S5 data ranging from 50-550 Hz, and performs an incoherent sum of coherent F-statistic power distributed amongst frequency-modulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3×10-24 and 8×10-25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof-of-principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ∼1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector. © 2015 American Physical Society.
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Directed search for gravitational waves from Scorpius X-1 with initial LIGO data - [published Version]

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