Dissecting star formation in the "atoms-for-Peace" galaxy: UVIT observations of the post-merger galaxy NGC7252
- Title
- Dissecting star formation in the "atoms-for-Peace" galaxy: UVIT observations of the post-merger galaxy NGC7252
- Creator
- George K.; Joseph P.; CP.; Ghosh S.K.; Hutchings J.B.; Mohan R.; Postma J.; Sankarasubramanian K.; Sreekumar P.; Stalin C.S.; Subramaniam A.; Tandon S.N.
- Description
- Context. The tidal tails of post-merger galaxies exhibit ongoing star formation far from their disks. The study of such systems can be useful for our understanding of gas condensation in diverse environments. Aims. The ongoing star formation in the tidal tails of post-merger galaxies can be directly studied from ultraviolet (UV) imaging observations. Methods. The post merger galaxy NGC7252 ("Atoms-for-Peace" galaxy) is observed with the Astrosat UV imaging telescope (UVIT) in broadband NUV and FUV filters to isolate the star-forming regions in the tidal tails and study the spatial variation in star formation rates. Results. Based on ultraviolet imaging observations, we discuss star-forming regions of ages <200 Myr in the tidal tails. We measure star formation rates in these regions and in the main body of the galaxy. The integrated star formation rate (SFR) of NGC7252 (i.e., that in the galaxy and tidal tails combined) without correcting for extinction is found to be 0.81 0.01 M yr-1. We show that the integrated SFR can change by an order of magnitude if the extinction correction used in SFR derived from other proxies are taken into consideration. The star formation rates in the associated tidal dwarf galaxies (NGC7252E, SFR = 0.02 M yr-1 and NGC7252NW, SFR = 0.03 M yr-1) are typical of dwarf galaxies in the local Universe. The spatial resolution of the UV images reveals a gradient in star formation within the tidal dwarf galaxy. The star formation rates show a dependence on the distance from the centre of the galaxy. This can be due to the different initial conditions responsible for the triggering of star formation in the gas reservoir that was expelled during the recent merger in NGC7252. 2018 ESO.
- Source
- Astronomy and Astrophysics, Vol-614
- Date
- 2018-01-01
- Publisher
- EDP Sciences
- Subject
- Galaxies: dwarf; Galaxies: interactions; Galaxies: star formation; Ultraviolet: galaxies
- Coverage
- George K., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Joseph P., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India, Department of Physics, Christ University, Bangalore, India; CP., National Research Council of Canada, Herzberg Astronomy and Astrophysics Research Centre, Victoria, Canada; Ghosh S.K., National Centre for Radio Astrophysics, Pune, India, Tata Institute of Fundamental Research, Mumbai, India; Hutchings J.B., National Research Council of Canada, Herzberg Astronomy and Astrophysics Research Centre, Victoria, Canada; Mohan R., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Postma J., University of Calgary, Calgary, AB, Canada; Sankarasubramanian K., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India, ISRO Satellite Centre, HAL Airport Road, Bangalore, India; Sreekumar P., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Stalin C.S., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Subramaniam A., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Tandon S.N., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India, Inter-University Center for Astronomy and Astrophysics, Pune, India
- Rights
- All Open Access; Bronze Open Access; Green Open Access
- Relation
- ISSN: 46361; CODEN: AAEJA
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
George K.; Joseph P.; CP.; Ghosh S.K.; Hutchings J.B.; Mohan R.; Postma J.; Sankarasubramanian K.; Sreekumar P.; Stalin C.S.; Subramaniam A.; Tandon S.N., “Dissecting star formation in the "atoms-for-Peace" galaxy: UVIT observations of the post-merger galaxy NGC7252,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/16872.