A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data
Considering radio-interferometric observations, we present a fast and efficient estimator to compute the binned angular bispectrum (ABS) from gridded visibility data. The estimator makes use of Fast Fourier Transform techniques to compute the ABS covering all possible triangle shapes and sizes. Here...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9b20 |
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| author | Sukhdeep Singh Gill Somnath Bharadwaj Sk. Saiyad Ali Khandakar Md Asif Elahi |
| author_facet | Sukhdeep Singh Gill Somnath Bharadwaj Sk. Saiyad Ali Khandakar Md Asif Elahi |
| author_sort | Sukhdeep Singh Gill |
| collection | DOAJ |
| description | Considering radio-interferometric observations, we present a fast and efficient estimator to compute the binned angular bispectrum (ABS) from gridded visibility data. The estimator makes use of Fast Fourier Transform techniques to compute the ABS covering all possible triangle shapes and sizes. Here, we present the formalism of the estimator and validate it using simulated visibility data for the Murchison Widefield Array observations at ν = 154.25 MHz. We find that our estimator is able to faithfully recover the ABS of the simulated sky signal with ≈10%–15% accuracy for a wide variety of triangle shapes and sizes across the range of angular multipoles 46 ≤ ℓ ≤ 1320. In future work, we plan to apply this to actual data and also generalize it to estimate the three-dimensional redshifted 21 cm bispectrum. |
| format | Article |
| id | doaj-art-92caacdc9359422696b086d53c765fe2 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-92caacdc9359422696b086d53c765fe22025-01-15T10:07:09ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0197912510.3847/1538-4357/ad9b20A Visibility-based Angular Bispectrum Estimator for Radio-interferometric DataSukhdeep Singh Gill0https://orcid.org/0000-0003-1629-3357Somnath Bharadwaj1https://orcid.org/0000-0002-2350-3669Sk. Saiyad Ali2https://orcid.org/0009-0006-4121-4955Khandakar Md Asif Elahi3https://orcid.org/0000-0003-1206-8689Department of Physics, Indian Institute of Technology Kharagpur , Kharagpur 721302, India ; sukhdeepsingh5ab@gmail.comDepartment of Physics, Indian Institute of Technology Kharagpur , Kharagpur 721302, India ; sukhdeepsingh5ab@gmail.comDepartment of Physics, Jadavpur University , Kolkata 700032, IndiaCentre for Strings, Gravitation and Cosmology, Department of Physics, Indian Institute of Technology Madras , Chennai 600036, IndiaConsidering radio-interferometric observations, we present a fast and efficient estimator to compute the binned angular bispectrum (ABS) from gridded visibility data. The estimator makes use of Fast Fourier Transform techniques to compute the ABS covering all possible triangle shapes and sizes. Here, we present the formalism of the estimator and validate it using simulated visibility data for the Murchison Widefield Array observations at ν = 154.25 MHz. We find that our estimator is able to faithfully recover the ABS of the simulated sky signal with ≈10%–15% accuracy for a wide variety of triangle shapes and sizes across the range of angular multipoles 46 ≤ ℓ ≤ 1320. In future work, we plan to apply this to actual data and also generalize it to estimate the three-dimensional redshifted 21 cm bispectrum.https://doi.org/10.3847/1538-4357/ad9b20Astronomy data analysisInterferometric correlationDiffuse radiationVisibility functionRadio interferometry |
| spellingShingle | Sukhdeep Singh Gill Somnath Bharadwaj Sk. Saiyad Ali Khandakar Md Asif Elahi A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data The Astrophysical Journal Astronomy data analysis Interferometric correlation Diffuse radiation Visibility function Radio interferometry |
| title | A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data |
| title_full | A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data |
| title_fullStr | A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data |
| title_full_unstemmed | A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data |
| title_short | A Visibility-based Angular Bispectrum Estimator for Radio-interferometric Data |
| title_sort | visibility based angular bispectrum estimator for radio interferometric data |
| topic | Astronomy data analysis Interferometric correlation Diffuse radiation Visibility function Radio interferometry |
| url | https://doi.org/10.3847/1538-4357/ad9b20 |
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