| Name: | Romeo Pallikkara |
| Affiliation: | Indian Institute of Science Education and Research Mohali |
| Conference ID: | ASI2025_137 |
| Title: | Ultraviolet Luminosity Function of Very High-Redshift Galaxies Using James Webb Space Telescope |
| Authors: | Romeo Pallikkara 1, Dr. Vikram Khaire 2 |
| Authors Affiliation: | 1 Romeo Pallikkara Affiliation (Indian Institute of Science Education and Research(IISER) Mohali, Punjab 140306, India)
2 Dr. Vikram Khaire Affiliation (Indian Institute Of Technology (IIT) Tirupati, Chindepalle, Andhra Pradesh 517619, India)
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| Mode of Presentation: | Poster |
| Abstract Category: | Galaxies and Cosmology |
| Abstract: | The luminosity functions of high-redshift galaxies offer critical insights into early galaxy formation, star formation efficiency, and the progression of hydrogen reionization. We are studying the evolution of the ultraviolet galaxy luminosity function from redshift 7.5 to 15 using photometric and spectroscopic data from the James Webb Space Telescope (JWST). Our analysis utilizes archival images from the JWST Near-Infrared Camera, covering 7 wavebands across a 90-square-arcminute area of the sky. We identified ~51 galaxies within the redshift range 7.5 < z < 8.5 through Lyman break selection, with redshifts confirmed via spectral energy distribution fitting to photometric data. To measure the luminosity function, we applied completeness corrections across all observed fields, using injection-recovery simulations to account for observational limitations and biases. Where available, some photometrically selected galaxies were cross-referenced with NIRSpec spectroscopic data for validation. Using our measured luminosity function, we estimated a star formation rate density consistent with recent studies. Building on this, we plan to extend our analysis to even higher redshifts, up to z = 15, to explore the evolution of the galaxy luminosity function, star formation rate density, and their influence on hydrogen reionization. |
