The MAGPI Survey
- Autor(en)
- T. Mukherjee, T. Zafar, T. Nanayakkara, A. Gupta, S. Gurung-Lopez, A. Battisti, E. Wisnioski, C. Foster, J. T. Mendel, K. E. Harborne, C. D. P. Lagos, T. Kodama, S. M. Croom, S. Thater, J. Webb, S. Barsanti, S. M. Sweet, J. Prathap, L. M. Valenzuela, A. Mailvaganam, J. L. Carrillo Martinez
- Abstrakt
We present spectroscopic properties of 22 Lyman-alpha emitters(LAEs) at z=5.5-6.6 with Lyman-alpha(Lya) luminosity log($L_{Lya}$[$ergs^{-1}$])=42.4-43.5, obtained using VLT/MUSE as part of the Middle Ages Galaxy Properties with Integral Field Spectroscopy(MAGPI) survey. Additionally, we incorporate broad-band photometric data from the Subaru Hyper Suprime-Cam(HSC) for 17 LAEs in our sample. The HSC-y band magnitudes show that our LAEs are UV-bright, with rest-frame absolute UV magnitudes -19.7 < $M_{UV}$ < -23.3. We find that the Lya line width increases with luminosity, and this trend becomes more prominent at z > 6 where Lya lines become significantly broadened (> 260 $kms^{-1}$) at luminosities log($L_{Lya}$[$ergs^{-1}$]) > 43. This broadening is consistent with previous studies, suggesting that these sources are located inside larger ionized bubbles. We observe a slightly elevated ionizing photon production efficiency estimated for LAEs at z > 6, indicating that younger galaxies could be producing more ionizing photons per UV luminosity. A tentative anti-correlation between ionizing photon production efficiency and Lya rest-frame equivalent width is noticed, which could indicate a time delay between production and escape of ionizing photon primarily due to supernovae activity. Furthermore, we find a positive correlation between bubble radius and Lya line width, which again suggests that large ionized bubbles are created around these LAEs, allowing them to self-shield from the scattering effects of the intergalactic medium (IGM). We also detect two closely separated LAEs at z=6.046 (projected spatial separation is 15.92 kpc). The size of their respective bubbles suggests that they likely sit inside a common large ionized region. Such a closely-separated LAE pair increases the size of ionized bubble, potentially allowing a boosted transmission of Lya through neutral IGM and also supports an accelerated reionisation scenario.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Macquarie University, ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Swinburne University of Technology, Curtin University, Universitat de València, Australian National University, University of Western Australia, University of New South Wales, Tohoku University, The University of Sydney, University of Queensland, Ludwig-Maximilians-Universität München
- Journal
- Publications of the Astronomical Society of Australia
- Band
- 41
- Anzahl der Seiten
- 14
- ISSN
- 1323-3580
- DOI
- https://doi.org/10.1017/pasa.2024.112
- Publikationsdatum
- 11-2024
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/fc24ce3f-fe2c-4d10-a0e8-a7b1c643de4e