The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 42 Issue 2
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- Pages.46.2-46.2
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- 2017
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- 1226-2692(pISSN)
Discovery of an elliptical jellyfish galaxy with MUSE
- Sheen, Yun-Kyeong (Korea Astronomy and Space Science Institute) ;
- Smith, Rory (Korea Astronomy and Space Science Institute) ;
- Jaffe, Yara (ESO) ;
-
Kim, Minjin
(Korea Astronomy and Space Science Institute)
;
- Duc, Pierre-Alain (CEA-Saclay) ;
- Ree, Chang Hee (Korea Astronomy and Space Science Institute) ;
- Nantais, Julie (University of Andres Bello) ;
- Candlish, Graeme (University of Valparaiso) ;
- Yi, Sukyoung (Yonsei University) ;
- Demarco, Ricardo (University of Concepcion) ;
- Treister, Ezequiel (Pontifical Catholic University of Chile)
- Published : 2017.10.10
Abstract
We will present a discovery of an elliptical jellyfish galaxy in Abell 2670 (Sheen et al. 2017, ApJL, 840, L7). Our MUSE IFU spectra revealed a rotating gas disk in the center of the galaxy and long ionised gas tails emanating from the disk. Its one-sided tails and a tadpole-like morphology of star-forming blobs around the galaxy suggested that the galaxy is experiencing strong ram-pressure stripping in the cluster environment. Stellar kinematics with stellar absorption lines in the MUSE spectra demonstrated that the galaxy is an elliptical galaxy without any hint of a stellar disk. Then, the primary question would be the origin of the rich gas component in the elliptical galaxy. A plausible scenario is a wet merger with a gas-rich companion. In order to investigate star formation history of the system (the galaxy and star-forming blobs), we derived star-formation rate and metallicity from the MUSE spectra. Photometric UV-Optica-IR SED fitting was also performed using GALEX, SDSS, 2MASS and WISE data, to estimate dust and gas masses in the system. For a better understanding of star formation history and environmental effect of this galaxy, FIR/sub-mm follow-up observations are proposed.
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