تقرير
CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7
| العنوان: | CANUCS: UV and Ionising Properties of Dwarf Star Forming Galaxies at z = 5 to 7 |
|---|---|
| المؤلفون: | 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. |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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$\alpha$ equivalent widths. Finally, we investigate the trends of H$\alpha$ and [OIII]+H$\beta$ EWs with UV magnitude and find M$_{UV}$ is correlated between H$\alpha$ but not with [OIII]+H$\beta$ EWs indicating low metallicities and recent burst in the UV faint galaxies. Comment: Accepted For Publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2406.17128 |
| رقم الأكسشن: | edsarx.2406.17128 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |