| Name: | Ujjwal Krishnan |
| Affiliation: | CHRIST (Deemed to be University), Bangalore |
| Conference ID : | ASI2023_666 |
| Title : | Can galaxies evolve without interaction? New insights into the secular evolution of galaxies |
| Authors : | Ujjwal Krishnan, Sreeja S Kartha, Smitha Subramanian, Koshy George, Robin Thomas, Akhil Krishna R, Blesson Mathew |
| Mode of Presentation: | Oral |
| Abstract Category : | Extragalactic Astronomy |
| Abstract : | In the local Universe, the evolution of the galaxies is majorly affected by secular effects. Star-formation properties of a galaxy can be used to trace the evolution of the galaxy. Since the UV flux is a direct indicator of the star formation in galaxies, the UltraViolet Imaging Telescope (UVIT) onboard AstroSat enables us to characterise the star-forming knots in the galaxy (within angular scales < 1.5"). Isolated galaxies are the best template to unravel the effects of disk instabilities in the secular evolution of the galaxies. In this study, we intend to understand the secular evolution of two isolated disk galaxies in the local Universe, NGC 628 and NGC 2903, using high-resolution UVIT images. The morphological similarity of the sample galaxies with the Milky Way provides an excellent opportunity to decipher the factors contributing to the evolution of our galaxy. UVIT images are used to identify and characterise the star forming regions in NGC 628 and NGC 2903. The star-formation properties of the spiral arms are studied using the estimated parameters and are correlated with the spiral arm formation scenarios. In the case of NGC 2903, it is found that the star-formation properties of the galaxy are affected by the presence of the bar. On the other hand, spiral arms play a significant role in the evolution of NGC 628.
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