UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation
- Title
- UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation
- Creator
- George K.; Joseph P.; Mondal C.; Devaraj A.; Subramaniam A.; Stalin C.S.; CP.; Ghosh S.K.; Hutchings J.B.; Mohan R.; Postma J.; Sankarasubramanian K.; Sreekumar P.; Tandon S.N.
- Description
- Context. Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy, though the details are still unclear. Aims. Here we explore the pattern of recent star formation in the central region of the post-merger galaxy NGC 7252 using high-resolution ultraviolet (UV) images from the UVIT on ASTROSAT. Methods. The UVIT images with 1.2 and 1.4 arcsec resolution in the FUV and NUV are used to construct a FUV-NUV colour map of the central region. Results. The FUV-NUV pixel colour map for this canonical post-merger galaxy reveals a blue circumnuclear ring of diameter ?10?? (3.2 kpc) with bluer patches located over the ring. Based on a comparison to single stellar population models, we show that the ring is comprised of stellar populations with ages ? 300 Myr, with embedded star-forming clumps of younger age (? 150Myr). Conclusions. The suppressed star formation in the central region, along with the recent finding of a large amount of ionised gas, leads us to speculate that this ring may be connected to past feedback from a central super-massive black hole that has ionised the hydrogen gas in the central ?4?? ?1.3 kpc. ESO 2018.
- Source
- Astronomy and Astrophysics, Vol-613
- Date
- 2018-01-01
- Publisher
- EDP Sciences
- Subject
- Galaxies: elliptical and lenticular, cD; Galaxies: evolution; Galaxies: formation; Galaxies: nuclei; 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; Mondal C., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Devaraj A., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Subramaniam A., Indian Institute of Astrophysics, Koramangala II Block, Bangalore, India; Stalin C.S., Indian Institute of Astrophysics, Koramangala II Block, 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; 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.; Mondal C.; Devaraj A.; Subramaniam A.; Stalin C.S.; CP.; Ghosh S.K.; Hutchings J.B.; Mohan R.; Postma J.; Sankarasubramanian K.; Sreekumar P.; Tandon S.N., “UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation,” CHRIST (Deemed To Be University) Institutional Repository, accessed April 25, 2025, https://archives.christuniversity.in/items/show/16922.