Understanding the secular evolution of NGC 628 using UltraViolet Imaging Telescope
- Title
- Understanding the secular evolution of NGC 628 using UltraViolet Imaging Telescope
- Creator
- Ujjwal K.; Kartha S.S.; Subramanian S.; George K.; Thomas R.; Mathew B.
- Description
- Secular and environmental effects play a significant role in regulating the star-formation rate and hence the evolution of the galaxies. Since ultraviolet (UV) flux is a direct tracer of the star formation in galaxies, the UltraViolet Imaging Telescope (UVIT) onboard AstroSat enables us to characterize the star-forming regions in a galaxy with its remarkable spatial resolution. In this study, we focus on the secular evolution of NGC 628, a spiral galaxy in the local Universe. We exploit the resolution of UVIT to resolve up to ?63 pc in NGC 628 for identification and characterization of the star-forming regions. We identify 300 star-forming regions in the UVIT far-UV image of NGC 628 using ProFound and the identified regions are characterized using Starburst99 models. The age and mass distribution of the star-forming regions across the galaxy supports the inside-out growth of the disc. We find that there is no significant difference in the star-formation properties between the two arms of NGC 628. We also quantify the azimuthal offset of the star-forming regions of different ages. Since we do not find an age gradient, we suggest that the spiral density waves might not be the possible formation scenario of the spiral arms of NGC 628. The headlight cloud present in the disc of the galaxy is found to be having the highest star-formation rate density (0.23 Myr-1 kpc-2) compared to other star-forming regions on spiral arms and the rest of the galaxy. 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
- Source
- Monthly Notices of the Royal Astronomical Society, Vol-516, No. 2, pp. 2171-2180.
- Date
- 2022-01-01
- Publisher
- Oxford University Press
- Subject
- galaxies: evolution; galaxies: spiral; galaxies: star formation
- Coverage
- Ujjwal K., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Kartha S.S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Subramanian S., Indian Institute of Astrophysics, Sarjapur Road, Koramangala, Bangalore, 560034, India; George K., Faculty of Physics, Ludwig-Maximilians-Universit, Scheinerstr 1, Munich, D-81679, Germany; Thomas R., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Mathew B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India
- Rights
- All Open Access; Green Open Access
- Relation
- ISSN: 358711; CODEN: MNRAA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Ujjwal K.; Kartha S.S.; Subramanian S.; George K.; Thomas R.; Mathew B., “Understanding the secular evolution of NGC 628 using UltraViolet Imaging Telescope,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/14865.