| Name: Sravya Kalachaveedu |
| Affiliation: Indian Institute of Science Education and Research (IISER) - Mohali / National Astronomical Observatory of Japan, Mitaka, Tokyo |
| Conference ID: ASI2026_329 |
| Title: A study of galaxy evolution along large scale structures at intermediate redshifts |
| Abstract Type: Poster |
| Abstract Category: Galaxies and Cosmology |
| Author(s) and Co-Author(s) with Affiliation: Sravya Kalachaveedu(Indian Institute of Science Education and Research - Mohali, Mohali - 140306, India), Yusei Koyama(National Astronomical Observatory of Japan, Mitaka, Tokyo - 181-8588), Ronaldo Laishram(National Astronomical Observatory of Japan, Mitaka, Tokyo - 181-8588) |
| Abstract: We study environmental influences on galaxy evolution within the intermediate-redshift cluster Abell 851 (z~0.41). Using Subaru Hyper Suprime-Cam imaging, we probe star formation activity across the large-scale structure, which comprises a dense core, infalling groups, and extended filamentary regions spanning several Mpc. We are able to study the properties of galaxy populations from high-density cores to intermediate-density filaments.
Subaru HSC imaging is deeper and has a wider field of view (~1.5 square degrees) than any previous surveys of the region, which has allowed us to discover new structures surrounding the main cluster core. We quantify star-formation activity using observed galaxy colours and construct colour-magnitude relations as functions of both local density and global environment. In addition, deep narrowband imaging (NB921 and NB926) identifies Hɑ-emitting galaxies, directly tracing actively star-forming systems at z~0.41. By comparing Hɑ-derived activity, colours, and specific star-formation rates across environmental regimes, we aim to learn more and provide insights about quenching processes operating in the cluster core, infalling groups, and filamentary structures.
The dual approach of observed colours and Hɑ emission provides complementary constraints on assembly histories and the role of environment in regulating star formation. The study therefore offers a view of how large-scale structure and local conditions for the galaxies shape their evolution at intermediate redshift.
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