The AstroSat UV Deep Field South. III. Evolution of the UV Luminosity Function and Luminosity Density from z~0.8-0.4
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| Format: | Preprint |
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2025
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| author | Bhattacharya, Souradeep Saha, Kanak |
| author_facet | Bhattacharya, Souradeep Saha, Kanak |
| contents | We characterise the rest-frame 1500 Å UV luminosity Function (UVLF) from deep AstroSat/UVIT F154W and N242W imaging in the Great Observatories Origins Survey South (GOODS-S) deep field. The UVLFs are constructed and subsequently characterised with fitted Schechter function parameters from FUV observations at z$<0.13$ and NUV observations in seven redshift bins in z~0.8-0.4. The UVLF slope ($α$) and characteristic magnitude ($M^*$) are consistent with previous determinations for this redshift range based on AstroSat/UVIT GOODS-North observations, as well as with those from Galaxy evolution Explorer and Hubble Space Telescope observations. However, differences in the normalisation factor ($ϕ_{*}$) are present for UVLFs for some redshift bins. We compute the UV luminosity density, $ρ_{\rm UV}$, combining our determined UVLF parameters with literature determinations out to z$\sim10$. The $ρ_{\rm UV}$ trend with redshift implies the rapid increase in cosmic star formation till its peak at z$\sim3$ (cosmic noon) followed by a slow decline till present day. Both the initial increase in cosmic star formation and subsequent decline are found to be more rapid than previous determinations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_11787 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The AstroSat UV Deep Field South. III. Evolution of the UV Luminosity Function and Luminosity Density from z~0.8-0.4 Bhattacharya, Souradeep Saha, Kanak Astrophysics of Galaxies We characterise the rest-frame 1500 Å UV luminosity Function (UVLF) from deep AstroSat/UVIT F154W and N242W imaging in the Great Observatories Origins Survey South (GOODS-S) deep field. The UVLFs are constructed and subsequently characterised with fitted Schechter function parameters from FUV observations at z$<0.13$ and NUV observations in seven redshift bins in z~0.8-0.4. The UVLF slope ($α$) and characteristic magnitude ($M^*$) are consistent with previous determinations for this redshift range based on AstroSat/UVIT GOODS-North observations, as well as with those from Galaxy evolution Explorer and Hubble Space Telescope observations. However, differences in the normalisation factor ($ϕ_{*}$) are present for UVLFs for some redshift bins. We compute the UV luminosity density, $ρ_{\rm UV}$, combining our determined UVLF parameters with literature determinations out to z$\sim10$. The $ρ_{\rm UV}$ trend with redshift implies the rapid increase in cosmic star formation till its peak at z$\sim3$ (cosmic noon) followed by a slow decline till present day. Both the initial increase in cosmic star formation and subsequent decline are found to be more rapid than previous determinations. |
| title | The AstroSat UV Deep Field South. III. Evolution of the UV Luminosity Function and Luminosity Density from z~0.8-0.4 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.11787 |