首页> 外文期刊>The Astronomical journal >Globular clusters around galaxies in groups
【24h】

Globular clusters around galaxies in groups

机译:Globular clusters around galaxies in groups

获取原文
获取原文并翻译 | 示例
           

摘要

We have obtained deep photometry of NGC 1199 ( in the compact group HCG 22) and NGC 6868 ( in the Telescopium loose group) with the Keck II and the ESO VLT-I telescopes. Each galaxy is the optically brightest galaxy of its group. NGC 1199 has two companion galaxies at a median projected distance of only 33 kpc and, based on its peculiar internal structure and large X-ray halo, NGC 6868 has been proposed to be a merger remnant. Our analysis of B and R images uncovered a population of globular clusters around both galaxies, with total ( and local) specific frequency S-N = 3.6+/-1.8 (3.4+/-1.5) for NGC 1199 and S-N = 1.8+/-1.1 (0.8+/-0.4) for NGC 6868. The radial pro le of the globular clusters of NGC 1199 follows the light distribution of the galaxy and can be fitted by a power law and a core model with a very steep slope (alpha = 2.5+/-0.3). In the case of NGC 6868, the profile of the globular clusters is well fitted by a power law and a core model pro le of slope 1.4+/-0.3 and is shallower than the galaxy light distribution. Maximum likelihood fitting of two Gaussians to the globular cluster color distribution yields a high significance for multimodality, with peaks centered at (B-R)(0) = 1.13+/-0.04 and 1.42+/-0.04 ( NGC 1199) and (B-R)(0) = 1.12+/-0.07 and 1.42+/-0.07 (NGC 6868). NGC 1199 and NGC 6868 are good examples of galaxies in which the group environment is likely to have affected their dynamical evolution. We find that for NGC 1199 the properties of the globular cluster system are similar to those for other systems around external elliptical galaxies located in less dense environments but with a very steep radial pro le. In the case of NGC 6868, we find a regular radial pro le and color distribution and a comparatively low specific frequency for the globular cluster system of the galaxy. References: 54

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号