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| Главные авторы: | , , , |
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| Формат: | Preprint |
| Опубликовано: |
2025
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| Online-ссылка: | https://arxiv.org/abs/2510.07386 |
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| _version_ | 1866909832208973824 |
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| author | McKean, J. P. Spingola, C. Powell, D. M. Vegetti, S. |
| author_facet | McKean, J. P. Spingola, C. Powell, D. M. Vegetti, S. |
| contents | Compact symmetric objects (CSOs) are thought to be short-lived radio sources with two lobes of emission that are separated by less than a kpc in projection. However, studies of such systems at high redshift is challenging due to the limited resolution of present-day telescopes, and can be biased to the most luminous objects. Here we report imaging of a gravitationally lensed CSO at a redshift of 2.059 using very long baseline interferometry at 1.7 GHz. The data are imaged using Bayesian forward modelling deconvolution, which reveals a spectacularly extended and thin gravitational arc, and several resolved features within the lensed images. The surface brightness of the lensing-corrected source shows two mini-lobes separated by 642 pc in projection, with evidence of multiple hotspots that have brightness temperatures of 10^8.6 to 10^9.2 K, and a total luminosity density of 10^26.3 W / Hz. By combining the well-resolved radio source morphology with previous multi-wavelength studies, we conclude that this object is likely a CSO of type 2, and that the properties are consistent with the bow-shock model for compact radio sources. Our analysis highlights the importance of combining high quality data sets with sophisticated imaging and modelling algorithms for studying the high redshift Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_07386 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An extended and extremely thin gravitational arc from a lensed compact symmetric object at redshift 2.059 McKean, J. P. Spingola, C. Powell, D. M. Vegetti, S. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Compact symmetric objects (CSOs) are thought to be short-lived radio sources with two lobes of emission that are separated by less than a kpc in projection. However, studies of such systems at high redshift is challenging due to the limited resolution of present-day telescopes, and can be biased to the most luminous objects. Here we report imaging of a gravitationally lensed CSO at a redshift of 2.059 using very long baseline interferometry at 1.7 GHz. The data are imaged using Bayesian forward modelling deconvolution, which reveals a spectacularly extended and thin gravitational arc, and several resolved features within the lensed images. The surface brightness of the lensing-corrected source shows two mini-lobes separated by 642 pc in projection, with evidence of multiple hotspots that have brightness temperatures of 10^8.6 to 10^9.2 K, and a total luminosity density of 10^26.3 W / Hz. By combining the well-resolved radio source morphology with previous multi-wavelength studies, we conclude that this object is likely a CSO of type 2, and that the properties are consistent with the bow-shock model for compact radio sources. Our analysis highlights the importance of combining high quality data sets with sophisticated imaging and modelling algorithms for studying the high redshift Universe. |
| title | An extended and extremely thin gravitational arc from a lensed compact symmetric object at redshift 2.059 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2510.07386 |