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The Origin of the Dispersion in the Size Distribution of Red Early-Type Galaxies
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  • The Origin of the Dispersion in the Size Distribution of Red Early-Type Galaxies
  • The Origin of the Dispersion in the Size Distribution of Red Early-Type Galaxies
저자명
이준협,김민진,이창희,김상철,이종철,이혜란,정현진,선광일,경재만,오규석,Lee. Joon Hyeop,Kim. Minjin,Ree. Chang Hee,Kim. Sang Chul,Lee. Jong Chul,Lee. Hye-Ran,Je
간행물명
천문학회보
권/호정보
2013년|38권 1호|pp.30-30 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

The sizes of galaxies are known to be closely related with their masses, luminosities, redshifts and morphologies. However, when we fix these quantities and morphology, we still find large dispersions in the galaxy size distribution. We investigate the origin of these dispersions for red early-type galaxies, using two SDSS-based catalogs. We find that the sizes of faint galaxies (${log}(M_{dyn}/M_{odot})$ < 10.3 or $M_r$ >-19.5) are affected more significantly by luminosity, while the sizes of bright galaxies (${log}(M_{dyn}/M_{odot})$ > 11.4 or $M_r$ <-21.4) are by dynamical mass. At fixed mass and luminosity, the sizes of low-mass galaxies (${log}(M_{dyn}/M_{odot})$ ~ 10.45 and $M_r$~-19.8) are relatively less sensitive to their colors, color gradients and axis ratios. On the other hand, the sizes of intermediate-mass (${log}(M_{dyn}/M_{odot})$ ~ 10.85 and $M_r$~-20.4) and high-mass (${log}(M_{dyn}/M_{odot})$ ~ 11.25 and $M_r$~-21.0) galaxies significantly depend on those parameters, in the sense that larger red early-type galaxies have bluer colors, more negative color gradients (bluer outskirts) and smaller axis ratios. These results indicate that the sizes of intermediate- and high-mass red early-type galaxies are significantly affected by their recent minor mergers or rotations. Major dry mergers also may have influenced on the size growth of high-mass red early-type galaxies.