Naidu, R. P., Matthee, J., Kramarenko, I., et al. (2024). All the Little Things in Abell 2744: > 1000 Gravitationally Lensed Dwarf Galaxies at z = 0 −9 from JWST NIRCam Grism Spectroscopy. arXiv preprint arXiv:2410.01874v1.
This research paper presents the All the Little Things (ALT) survey, a deep spectroscopic survey using the JWST NIRCam grism to study a large sample of dwarf galaxies in the Abell 2744 cluster. The primary objectives are to investigate the properties of these dwarf galaxies, search for signatures of late-forming Population III stars, and understand their role in the epoch of reionization.
The ALT survey utilizes deep NIRCam grism spectroscopy (7-27 hours) at 3-4 µm, covering a 30 arcmin2 area in the Abell 2744 cluster. The team developed a novel "butterfly" mosaic strategy to mitigate spectral confusion and contamination. They combined this with ultra-deep F070W+F090W imaging to select faint, high-redshift sources. The "Allegro" method, alongside the grizli pipeline, was employed for emission line identification and redshift determination. Spectral energy distribution (SED) modeling provided insights into the physical properties of the observed galaxies.
The ALT survey demonstrates the effectiveness of deep grism surveys in leveraging strong lensing to study faint, high-redshift dwarf galaxies. The large sample size and spectroscopic data provide valuable insights into the properties and evolution of these galaxies, their potential role in hosting late-forming Population III stars, and their contribution to cosmic reionization.
This research significantly advances our understanding of early galaxy formation and the processes that shaped the early universe. The large spectroscopic sample of dwarf galaxies provides crucial constraints for models of galaxy evolution, chemical enrichment, and the sources responsible for reionizing the universe.
While the ALT survey provides a wealth of data, further analysis is required to fully exploit its potential. This includes detailed studies of individual galaxies and their properties, investigating the relationship between galaxy mass and Hβ luminosity, and exploring the implications of the observed clustering patterns. Future observations with other instruments, such as NIRSpec, will complement the ALT data and provide a more comprehensive view of these dwarf galaxies.
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