The AstroSat UV Deep Field South II: A diverse set of Lyman-continuum leakers at $z\sim1$
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909534972280832 |
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| author | Maulick, Soumil Saha, Kanak Rutkowski, Michael J. |
| author_facet | Maulick, Soumil Saha, Kanak Rutkowski, Michael J. |
| contents | We report the detection of 5 newly identifed Lyman-continuum (LyC) leaker candidates at redshifts 0.99-1.42 in the AstroSat UV Deep Field South F154W image. We derive physical properties of these galaxies using a combination of spectral-energy distribution fitting and information from publicly available spectra. The estimated escape fraction of these objects vary from 14-85\% after accounting for the IGM attenuation. With only about a dozen known leakers at these redshifts, these detections significantly raise the fraction of LyC leakers in this redshift range. High-resolution HST UV imaging reveals that a subset of the galaxies in our sample have blue star-forming structures that are likely associated with harder ionizing sources. We find tentative evidence that the LyC emission is spatially offset from the non-ionizing UV continuum centers of these galaxies. The integrated properties of these galaxies, such as the UV continuum slope, dust attenuation, stellar mass, and $[\text{O III}] λ5007/ [\text{O II}] λ3727$ ratios, make them atypical compared to known LyC leakers. The leakage of LyC photons from these systems presents a compelling challenge. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_09515 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The AstroSat UV Deep Field South II: A diverse set of Lyman-continuum leakers at $z\sim1$ Maulick, Soumil Saha, Kanak Rutkowski, Michael J. Astrophysics of Galaxies We report the detection of 5 newly identifed Lyman-continuum (LyC) leaker candidates at redshifts 0.99-1.42 in the AstroSat UV Deep Field South F154W image. We derive physical properties of these galaxies using a combination of spectral-energy distribution fitting and information from publicly available spectra. The estimated escape fraction of these objects vary from 14-85\% after accounting for the IGM attenuation. With only about a dozen known leakers at these redshifts, these detections significantly raise the fraction of LyC leakers in this redshift range. High-resolution HST UV imaging reveals that a subset of the galaxies in our sample have blue star-forming structures that are likely associated with harder ionizing sources. We find tentative evidence that the LyC emission is spatially offset from the non-ionizing UV continuum centers of these galaxies. The integrated properties of these galaxies, such as the UV continuum slope, dust attenuation, stellar mass, and $[\text{O III}] λ5007/ [\text{O II}] λ3727$ ratios, make them atypical compared to known LyC leakers. The leakage of LyC photons from these systems presents a compelling challenge. |
| title | The AstroSat UV Deep Field South II: A diverse set of Lyman-continuum leakers at $z\sim1$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.09515 |