Exploring the anisotropic gravitational wave background from all-sky mock gravitational wave event catalogues

Abstract

Anisotropic stochastic gravitational wave background (SGWB) serves as a potential probe of the large-scale structure (LSS) of the universe. In this work, we explore the anisotropic SGWB from local ($z<\sim 0.085$) merging stellar mass compact binaries, specifically focusing on merging stellar binary black holes, merging neutron-star-black-hole binaries, and merging binary neutron stars. The analysis employs seven all-sky mock lightcone gravitational wave event catalogues, which are derived from the Millennium simulation combined with a semi-analytic model of galaxy formation and a binary population synthesis model. We calculate the angular power spectra ${\mathrm{C}}_{\ell }$ at multipole moments $\ell$, expressed as ${\text{log}}_{10}[\ell (\ell +1){\mathrm{C}}_{\ell }/(2\pi )]$, based on the skymaps of the overdensity ${\delta }_{\mathrm{GW}}$ in the anisotropic SGWB. The spectra for all three source types exhibit an approximately linear increase with ${\text{log}}_{10}\ell$ at higher $\ell$ (e.g., $\ell >\sim 30-300$) in seven catalogues, with a characteristic slope of $\sim 2$. The spectra of seven catalogues exhibit considerable variations, arising from fluctuations in spatial distribution, primarily in the radial distribution, of nearby sources (e.g., $<50$ Mpc/h). After subtracting these nearby sources, the variations become much smaller and the spectra for the three source types become closely aligned (within discrepancies of a factor of $\sim 2$ across $\ell =1-1000$ for all catalogues). We also find that including further sources results in a rapid decrease in the anisotropy.

13 pages 5 figures

References in corpus (42)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Simulating the joint evolution of quasars, galaxies and their large-scale distribution
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
• The hierarchical formation of the brightest cluster galaxies
• The NANOGrav 15-year Data Set: Evidence for a Gravitational-Wave Background
• Search for an isotropic gravitational-wave background with the Parkes Pulsar Timing Array
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• Searching for the nano-Hertz stochastic gravitational wave background with the Chinese Pulsar Timing Array Data Release I
• The second data release from the European Pulsar Timing Array III. Search for gravitational wave signals
• Upper Limits on the Isotropic Gravitational-Wave Background from Advanced LIGO's and Advanced Virgo's Third Observing Run
• A template bank for gravitational waveforms from coalescing binary black holes: non-spinning binaries
• The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
• Stochastic Gravitational Wave Backgrounds
• COSMIC Variance in Binary Population Synthesis
• The high redshift galaxy population in hierarchical galaxy formation models
• Lightcone mock catalogues from semi-analytic models of galaxy formation - I. Construction and application to the BzK colour selection
• The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
• Stochastic Gravitational Wave Background from Coalescing Binary Black Holes
• MoMaF : The Mock Map Facility
• Anisotropy of the astrophysical gravitational wave background: analytic expression of the angular power spectrum and correlation with cosmological observations
• CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST
• First predictions of the angular power spectrum of the astrophysical gravitational wave background
• Anisotropies in the stochastic gravitational-wave background: Formalism and the cosmic string case
• Anisotropies in the astrophysical gravitational-wave background: Predictions for the detection of compact binaries by LIGO and Virgo
• Stochastic gravitational-wave background as a tool to investigate multi-channel astrophysical and primordial black-hole mergers
• Projection effects on the observed angular spectrum of the astrophysical stochastic gravitational wave background
• Properties of the stochastic astrophysical gravitational wave background: astrophysical sources dependencies
• Anisotropies in the astrophysical gravitational-wave background: The impact of black hole distributions
• Estimating the angular power spectrum of the gravitational-wave background in the presence of shot noise
• The $N_{\ell }$ of gravitational wave background experiments
• Shot noise in the astrophysical gravitational-wave background
• Detecting the anisotropic astrophysical gravitational wave background in the presence of shot noise through cross-correlations
• Searching for anisotropy in the distribution of binary black hole mergers
• GABE: Galaxy Assembly with Binary Evolution
• Unbiased estimation of gravitational-wave anisotropies from noisy data
• Exploring the multiband gravitational wave background with a semi-analytic galaxy formation model

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• Fundamental Physics and Cosmology with TianQin