2006/07/20 by Atsushi Taruya · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Pulsars and Gravitational Waves Research #Radio Astronomy Observations and Technology #astro-ph #gr-qc
paper · pdf · doi:10.1103/physrevd.74.104022
published as Phys.Rev.D74:104022,2006 · 15 pages, 10 figures, A version with high-resolution figures is available at http://www-utap.phys.s.u-tokyo.ac.jp/~ataruya/paper/ms_skymap3.pdf
arxiv created 2006/07/20 · openalex publication_date 2006/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We develop a numerical scheme to make a high-frequency skymap of gravitational-wave backgrounds (GWBs) observed via a space-based interferometer. Based on the cross correlation technique, the intensity distribution of anisotropic GWB can be directly reconstructed from the time-ordered data of cross correlation signals, with full knowledge of the detector's antenna pattern functions. We demonstrate how the planned space interferometer, LISA, can make a skymap of GWB for a specific example of anisotropic signals. At the frequency higher than the characteristic frequency f*=1/(2\ensuremathπL), where L is the arm-length of the detector, the reconstructed skymap free from the instrumental noise potentially reaches the angular resolution up to the multipoles \ensuremathℓ\ensuremath∼10. The presence of instrumental noises degrades the angular resolution. The resultant skymap has angular resolution with multipoles \ensuremathℓ\ensuremath≤6\ensuremath∼7 for the anisotropic signals with signal-to-noise ratio S/N>5.