<P>M105 is a standard elliptical galaxy, located in the Leo I Group. We present photometry of the resolved stars in its inner region at R approximate to 4' approximate to 4R(eff), obtained from F606W and F814W images in the Hubble Space Telescop...
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
https://www.riss.kr/link?id=A107503551
2016
-
SCI,SCIE,SCOPUS
학술저널
70
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>M105 is a standard elliptical galaxy, located in the Leo I Group. We present photometry of the resolved stars in its inner region at R approximate to 4' approximate to 4R(eff), obtained from F606W and F814W images in the Hubble Space Telescop...
<P>M105 is a standard elliptical galaxy, located in the Leo I Group. We present photometry of the resolved stars in its inner region at R approximate to 4' approximate to 4R(eff), obtained from F606W and F814W images in the Hubble Space Telescope archive. We combine this with photometry of the outer region at R approximate to 12' approximate to 12R(eff) from archival imaging data. Color-magnitude diagrams of the resolved stars in the inner region show a prominent red giant branch (RGB) with a large color range, while those for the outer region show better a narrow blue RGB. The metallicity distribution function (MDF) of the RGB stars shows the existence of two distinct subpopulations: a dominant metal-rich population (with a peak at [M/H] approximate to 0.0) and a much weaker metal-poor population (with a peak at [M/H] approximate to -1.1). The radial number density profiles of the metal-rich and metal-poor RGB stars are fit well by a Sersic law with n = 2.75 +/- 0.10 and n = 6.89 +/- 0.94, and by a single power law (sigma proportional to R-3.8 and sigma proportional to R-2.6), respectively. The MDFs of the inner and outer regions can be described well by accretion gas models of chemical evolution with two components. These provide strong evidence that there are two distinct stellar halos in this galaxy, blue metal-poor and red metal-rich halos, consistent with the results based on globular cluster systems in bright early-type galaxies (ETGs). We discuss the implications of these results with regard to the formation of massive ETGs in the dual halo mode formation scenario.</P>
GALAXY LUMINOSITY FUNCTION OF THE DYNAMICALLY YOUNG ABELL 119 CLUSTER: PROBING THE CLUSTER ASSEMBLY