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| Autors principals: | , , , , , , |
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| Format: | Preprint |
| Publicat: |
2024
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| Matèries: | |
| Accés en línia: | https://arxiv.org/abs/2403.19357 |
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| _version_ | 1866914740475789312 |
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| author | Jackson, Neal Badole, Shruti Dugdale, Thomas Stacey, Hannah R. Hartley, Philippa McKean, J. P. . |
| author_facet | Jackson, Neal Badole, Shruti Dugdale, Thomas Stacey, Hannah R. Hartley, Philippa McKean, J. P. . |
| contents | We present 6-GHz Very Large Array radio images of 70 gravitational lens systems at 300-mas resolution, in which the source is an optically-selected quasar, and nearly all of which have two lensed images. We find that about in half of the systems (40/70, with 33/70 secure), one or more lensed images are detected down to our detection limit of 20microJy/beam, similar to previous investigations and reinforcing the conclusion that typical optically-selected quasars have intrinsic GHz radio flux densities of a few microJy ($\sim10^{23}$WHz$^{-1}$ at redshifts of 1--2). In addition, for ten cases it is likely that the lensing galaxies are detected in the radio. Available detections of, and limits on the far-infrared luminosities from the literature, suggest that nearly all of the sample lie on the radio-FIR correlation typical of star-forming galaxies, and that their radio luminosities are at least compatible with the radio emission being produced by star formation processes. One object, WISE2329$-$1258, has an extra radio component that is not present in optical images, and is difficult to explain using simple lens models. In-band spectral indices, where these can be determined, are generally moderately steep and consistent with synchrotron processes either from star-formation/supernovae or AGN. Comparison of the A/B image flux ratios at radio and optical wavelengths suggests a 10 per cent level contribution from finite source effects or optical extinction to the optical flux ratios, together with sporadic larger discrepancies that are likely to be due to optical microlensing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_19357 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Radio imaging of gravitationally lensed radio-quiet quasars Jackson, Neal Badole, Shruti Dugdale, Thomas Stacey, Hannah R. Hartley, Philippa McKean, J. P. . Astrophysics of Galaxies We present 6-GHz Very Large Array radio images of 70 gravitational lens systems at 300-mas resolution, in which the source is an optically-selected quasar, and nearly all of which have two lensed images. We find that about in half of the systems (40/70, with 33/70 secure), one or more lensed images are detected down to our detection limit of 20microJy/beam, similar to previous investigations and reinforcing the conclusion that typical optically-selected quasars have intrinsic GHz radio flux densities of a few microJy ($\sim10^{23}$WHz$^{-1}$ at redshifts of 1--2). In addition, for ten cases it is likely that the lensing galaxies are detected in the radio. Available detections of, and limits on the far-infrared luminosities from the literature, suggest that nearly all of the sample lie on the radio-FIR correlation typical of star-forming galaxies, and that their radio luminosities are at least compatible with the radio emission being produced by star formation processes. One object, WISE2329$-$1258, has an extra radio component that is not present in optical images, and is difficult to explain using simple lens models. In-band spectral indices, where these can be determined, are generally moderately steep and consistent with synchrotron processes either from star-formation/supernovae or AGN. Comparison of the A/B image flux ratios at radio and optical wavelengths suggests a 10 per cent level contribution from finite source effects or optical extinction to the optical flux ratios, together with sporadic larger discrepancies that are likely to be due to optical microlensing. |
| title | Radio imaging of gravitationally lensed radio-quiet quasars |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.19357 |