Loosely coherent search in LIGO O1 data for continuous gravitational waves from Terzan 5 and the galactic center

Abstract

We report results of a search for continuous gravitational waves from a region covering the globular cluster Terzan 5 and the galactic center. Continuous gravitational waves are expected from fast-spinning, slightly non-axisymmetric isolated neutron stars as well as more exotic objects. The regions that we target are believed to be unusually abundant in neutron stars. We use a new loosely coherent search method that allows to reach unprecedented levels of sensitivity for this type of search. The search covers the frequency band 475-1500 Hz and frequency time derivatives in the range of [-3e-8, +1e-9] Hz/s, which is a parameter range not explored before with the depth reached by this search. As to be expected with only a few months of data from the same observing run, it is very difficult to make a confident detection of a continuous signal over such a large parameter space. A list of parameter space points that passed all the thresholds of this search is provided. We follow-up the most significant outlier on the newly released O2 data and cannot confirm it. We provide upper limits on the gravitational wave strength of signals as a function of signal frequency.

References in corpus (7)

• Advanced LIGO
• The ATNF Pulsar Catalogue
• The LIGO Open Science Center
• Directional limits on persistent gravitational waves from Advanced LIGO's first observing run
• Recent searches for continuous gravitational waves
• First low-frequency Einstein@Home all-sky search for continuous gravitational waves in Advanced LIGO data
• Postprocessing methods used in the search for continuous gravitational-wave signals from the Galactic Center

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• Status and perspectives of Continuous Gravitational Wave searches
• Constraints on planetary and asteroid-mass primordial black holes from continuous gravitational-wave searches
• All-sky, all-frequency directional search for persistent gravitational-waves from Advanced LIGO's and Advanced Virgo's first three observing runs
• Stochastic gravitational-wave background searches and constraints on neutron-star ellipticity
• Results from an Einstein@Home search for continuous gravitational waves from G347.3 at low frequencies in LIGO O2 data
• First Constraining Upper Limits on Gravitational Wave Emission from NS 1987A in SNR 1987A
• Anisotropic neutron star crust, solar system mountains, and gravitational waves
• Searches for continuous gravitational waves from young supernova remnants in the early third observing run of Advanced LIGO and Virgo
• Effects of orbital eccentricity on continuous gravitational waveforms from triaxially deformed precessing neutron stars in tight binaries
• Results from an Einstein@Home search for continuous gravitational waves from Cassiopeia A and Vela Jr. using LIGO O2 data