CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7
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| Format: | Preprint |
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2024
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| _version_ | 1866910500150837248 |
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| author | Harshan, Anishya Bradač, Maruša Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Desprez, Guillaume Iyer, Karthiek Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Rihtaršič, Gregor Sarrouh, Ghassan T. E. Sawicki, Marcin Strait, Victoria Willott, Chris J. |
| author_facet | Harshan, Anishya Bradač, Maruša Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Desprez, Guillaume Iyer, Karthiek Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Rihtaršič, Gregor Sarrouh, Ghassan T. E. Sawicki, Marcin Strait, Victoria Willott, Chris J. |
| contents | The epoch of reionisation progressed through the emission of ionising photons from galaxies to their local intergalactic medium. In this work, we characterise the dwarf star-forming galaxies as candidates for the source of ionising photons that drove EoR. We investigate the ionising properties and star formation histories of star-forming dwarf galaxies at the last stages of EoR at $4.8<\rm{z}<7$ using observations from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The magnification due to gravitational lensing allows us to probe large dynamic ranges in stellar mass ($2\times 10^{6}\leq\rm{M}_*/\rm{M}_\odot\leq5\times 10^{9}$) and UV magnitudes ($-22.68\leq$M$_{UV}\leq=-15.95$).We find a median UV slope \buv of $-2. 56\pm0.23$ and the production efficiency of ionising photons $\log$ \xiion $=25.39\pm0.6$ for the full sample ($4.8<\rm{z}<7$) with a median stellar mass of $6.3\pm0.5\times10^{7} \rm{M}_\odot$. We find both \buv and \xiion are marginally correlated with the stellar mass of the galaxy, indicating a possible greater contribution of dwarf galaxies to the reionisation of the Universe. We find that on average, galaxies in our sample are experiencing a recent rise/burst of star formation which translates to a higher scatter in \xiion and a large scatter in H$α$ equivalent widths. Finally, we investigate the trends of H$α$ and [OIII]+H$β$ EWs with UV magnitude and find M$_{UV}$ is correlated between H$α$ but not with [OIII]+H$β$ EWs indicating low metallicities and recent burst in the UV faint galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_17128 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7 Harshan, Anishya Bradač, Maruša Abraham, Roberto Asada, Yoshihisa Brammer, Gabriel Desprez, Guillaume Iyer, Karthiek Martis, Nicholas S. Matharu, Jasleen Mowla, Lamiya Muzzin, Adam Noirot, Gaël Rihtaršič, Gregor Sarrouh, Ghassan T. E. Sawicki, Marcin Strait, Victoria Willott, Chris J. Astrophysics of Galaxies The epoch of reionisation progressed through the emission of ionising photons from galaxies to their local intergalactic medium. In this work, we characterise the dwarf star-forming galaxies as candidates for the source of ionising photons that drove EoR. We investigate the ionising properties and star formation histories of star-forming dwarf galaxies at the last stages of EoR at $4.8<\rm{z}<7$ using observations from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). The magnification due to gravitational lensing allows us to probe large dynamic ranges in stellar mass ($2\times 10^{6}\leq\rm{M}_*/\rm{M}_\odot\leq5\times 10^{9}$) and UV magnitudes ($-22.68\leq$M$_{UV}\leq=-15.95$).We find a median UV slope \buv of $-2. 56\pm0.23$ and the production efficiency of ionising photons $\log$ \xiion $=25.39\pm0.6$ for the full sample ($4.8<\rm{z}<7$) with a median stellar mass of $6.3\pm0.5\times10^{7} \rm{M}_\odot$. We find both \buv and \xiion are marginally correlated with the stellar mass of the galaxy, indicating a possible greater contribution of dwarf galaxies to the reionisation of the Universe. We find that on average, galaxies in our sample are experiencing a recent rise/burst of star formation which translates to a higher scatter in \xiion and a large scatter in H$α$ equivalent widths. Finally, we investigate the trends of H$α$ and [OIII]+H$β$ EWs with UV magnitude and find M$_{UV}$ is correlated between H$α$ but not with [OIII]+H$β$ EWs indicating low metallicities and recent burst in the UV faint galaxies. |
| title | CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.17128 |