The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 37 Issue 2
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- Pages.82.2-82.2
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- 2012
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- 1226-2692(pISSN)
Relationship between hot gas halo and environmental factors of early-type galaxies
- Kim, Eunbin (Department of Astronomy and Space Science, Kyung Hee University) ;
- Choi, Yun-Young (Department of Astronomy and Space Science, Kyung Hee University) ;
- Kim, Sungsoo S. (Department of Astronomy and Space Science, Kyung Hee University) ;
- Park, Changbom (Korea Institute for Advanced Study)
- Published : 2012.10.17
Abstract
We present an investigation of X-ray hot gas halo in 21 early-type galaxies(ETGs) from cross-matched sample of XMM-Newton(2XMM-DR3 catalog) and SDSS DR 7(0.025 < z < 0.085 and Mr <-19.5). It has been controversial whether or not the environment affects X-ray luminosity of ETGs. In this research, we mainly considered how dense the surrounding galaxies of the target galaxy are and how isolated the target galaxy is from the nearest neighboring galaxy. It appears that the second environmental factor has more effects on X-ray luminosity (0.5-2 keV) of hot gas halo than the first one. We found that the closer a galaxy is to the nearest neighboring galaxy, the brighter it is when the galaxy is located within the neighbor galaxy's virial radius. However, when a galaxy is located outside the neighbor's virial radius, the luminosity does not show any trend. In this poster, we report preliminary results from our study.
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