The detection of strongly-lensed submillimetre galaxies
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arXiv
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2025
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| author | Sedgwick, Chris Serjeant, Stephen Weiner, Charles |
| author_facet | Sedgwick, Chris Serjeant, Stephen Weiner, Charles |
| contents | We present predictions of the number and properties of strongly-lensed submillimetre galaxies, based on an adaption of the physically-motivated LensPop model covering galaxy-galaxy strong lensing by elliptical galaxies, which successfully predicted optical and near-infrared lenses. For submillimetre-luminous lensed galaxies, the most efficient observational selection identifies sources with high fluxes (S500um > 80 mJy), where lensed sources outnumber bright unlensed sources; several hundred candidates from Herschel surveys have been identified, and confirmed by follow-up observations. We have tested our model against these observations. The model predicts an all-sky number density of 0.09+/-0.05 deg-2 (in absolute numbers, 3,600+/-1,800) of bright lensed galaxies detectable by this method. Observations show considerable variation in sky density between fields, 0.08 - 0.31 deg-2. Predictions of redshift and magnification distributions are comparable to observations, although the model appears to under-predict lenses at the highest magnifications ( > 20). We predict that the apparent AB magnitudes at visible wavelengths of the foreground lenses will be as faint as 28, whereas observations typically reach ~ 23, implying that some apparently unlensed bright submillimetre galaxies may have lensing galaxies below this detection limit. For fainter lensed galaxies, the model predicts over 130,000 systems with flux S500um > 10 mJy across the sky, of which ~ 3,400 remain be be discovered in the Herschel catalogues. We also predict that Euclid should be able to detect some 25,000 lensed submillimetre galaxies that are VIS-band 'dropouts' - detectable in the near-infrared but not at optical wavelengths. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_08369 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The detection of strongly-lensed submillimetre galaxies Sedgwick, Chris Serjeant, Stephen Weiner, Charles Astrophysics of Galaxies We present predictions of the number and properties of strongly-lensed submillimetre galaxies, based on an adaption of the physically-motivated LensPop model covering galaxy-galaxy strong lensing by elliptical galaxies, which successfully predicted optical and near-infrared lenses. For submillimetre-luminous lensed galaxies, the most efficient observational selection identifies sources with high fluxes (S500um > 80 mJy), where lensed sources outnumber bright unlensed sources; several hundred candidates from Herschel surveys have been identified, and confirmed by follow-up observations. We have tested our model against these observations. The model predicts an all-sky number density of 0.09+/-0.05 deg-2 (in absolute numbers, 3,600+/-1,800) of bright lensed galaxies detectable by this method. Observations show considerable variation in sky density between fields, 0.08 - 0.31 deg-2. Predictions of redshift and magnification distributions are comparable to observations, although the model appears to under-predict lenses at the highest magnifications ( > 20). We predict that the apparent AB magnitudes at visible wavelengths of the foreground lenses will be as faint as 28, whereas observations typically reach ~ 23, implying that some apparently unlensed bright submillimetre galaxies may have lensing galaxies below this detection limit. For fainter lensed galaxies, the model predicts over 130,000 systems with flux S500um > 10 mJy across the sky, of which ~ 3,400 remain be be discovered in the Herschel catalogues. We also predict that Euclid should be able to detect some 25,000 lensed submillimetre galaxies that are VIS-band 'dropouts' - detectable in the near-infrared but not at optical wavelengths. |
| title | The detection of strongly-lensed submillimetre galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.08369 |