期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 687, 期 2, 页码 L61-L64出版社
IOP PUBLISHING LTD
DOI: 10.1086/592836
关键词
galaxies: evolution; galaxies: high-redshift; infrared: galaxies
资金
- NASA [HST-GO-11082, HST-GO-11192]
- Science and Technology Facilities Council [ST/F00298X/1] Funding Source: researchfish
We measure the sizes of 82 massive (M >= 10(11) M-circle dot) galaxies at 1.7 <= z <= 3 utilizing deep HST NICMOS data taken in the GOODS North and South fields. Our sample is almost an order of magnitude larger than previous studies at these redshifts, providing the first statistical study of massive galaxy sizes at z > 2, confirming the extreme compactness of these systems. We split our sample into disk-like (n <= 2) and spheroid-like (n>2) galaxies based on their Sersic indices, and find that at a given stellar mass disk-like galaxies at are a z similar to 2.3 are a factor of 2.6 +/- 0.3 smaller than present-day equal-mass systems, and spheroid-like galaxies at the same redshifts are 4.3 +/- 0.7 smaller than comparatively massive elliptical galaxies today. At z > 2 our results are compatible with both a leveling off, or a mild evolution in size. Furthermore, the high density (similar to 2 x 10(10) M-circle dot kpc(-3)) of massive galaxies at these redshifts, which are similar to present-day globular clusters, possibly makes any further evolution in sizes beyond z = 3 unlikely.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据