ItemArticle

Probing the resolved K-S relation in nearby galaxies: Insights from UVIT and ALMA observations

Title
Probing the resolved K-S relation in nearby galaxies: Insights from UVIT and ALMA observations
Creator
Sruthi, K.; Kartha, Sreeja S.; Mathew, Blesson; Krishnan, Ujjwal; Akhil, Krishna R.; Ray, Shankar
Description
This study examines the resolved Kennicutt-Schmidt (rK-S) relation, defined as the connection between the star formation rate surface density (?SFR) and the molecular gas mass surface density (?H2) in the high-density central regions of three nearby barred spiral galaxies hosting AGN: NGC 1365, NGC 1433, and NGC 1566. Utilising high-resolution archival data from AstroSat/UVIT for UV imaging and Atacama Large Millimetere/submillimetre Array (ALMA) for CO(2-1) molecular gas mapping, we explore recent star formation and gas distribution with a spatial resolution of ?120132 pc. Our findings reveal a sublinear rK-S law, with slopes ranging from ?0.17 to ?0.71. Notably, NGC 1566 exhibits a robust rK-S relation consistent with previous studies, while NGC 1365 and NGC 1433 exhibit weaker correlations. These differences are likely due to the smaller number of identified star-forming regions in these galaxies compared to NGC 1566, as well as the central molecular gas concentrations and varying star formation activity in their bars and nuclear regions. These results also support the idea that the rK-S relation deviates from linearity in extreme environments, such as starburst galaxies and galactic centres. Additionally, we find a generally low median star formation efficiency (SFE) within the bars of these galaxies, suggesting that while bars may drive nuclear starbursts and contribute to bulge growth, they do not significantly increase SFE. Furthermore, a negative correlation between SFE and ?H2 is observed across the sample, both within and outside the bar regions, suggesting that higher ?H2 may lead to lower SFE in the central regions of these galaxies. Our findings highlight that ?H2 plays a primary role in shaping the observed trends in SFE, rather than the presence of a bar itself. The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia The Author(s)
Source
Publications of the Astronomical Society of Australia;Volume;42;Issue;;Article No.;e140;
Date
01-01-2025
Publisher
Cambridge University Press
Subject
galaxies: active; galaxies: photometry; Galaxies: star formation; submillimetre: galaxies; ultraviolet: galaxies
Coverage
Sruthi K., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India; Kartha S.S., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India; Mathew B., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India; Krishnan U., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India; Akhil K.R., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India; Ray S., Centre of Excellence in Astronomy and Astrophysics, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, India
Rights
All Open Access; Green Open Access; Hybrid Gold Open Access
Relation
ISSN: 13233580;
Format
online
Language
English
Type
Article

Citation

Sruthi, K.; Kartha, Sreeja S.; Mathew, Blesson; Krishnan, Ujjwal; Akhil, Krishna R.; Ray, Shankar, “Probing the resolved K-S relation in nearby galaxies: Insights from UVIT and ALMA observations,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 19, 2026, https://archives.christuniversity.in/items/show/22485.

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