星系-星系透镜效应下星系大小与晕质量的相关性  

The Correlation between Galaxy Size and Halo Mass from Galaxy-galaxy Lensing

作　　者：闫大伟 王晴晴 张聪聪 罗文涛 方文娟 张育飞 李佳迅 YAN Da-wei;WANG Qing-qing;ZHANG Cong-cong;LUO Wen-tao;FANG Wen-juan;ZHANG Yu-fei;LI Jia-xun(Department of Astronomy,School of Physical Sciences,University of Science and Technology of China,Hefei 230026;School of Astronomy and Space Science,University of Science and Technology of China,Nanjing 210023;College of Mathematics and Physics,Leshan Normal University,Leshan 614000)

机构地区：[1]中国科学技术大学物理学院天文系,合肥230026 [2]中国科学技术大学天文与空间科学学院,南京210023 [3]乐山师范学院数理学院,乐山614000

出　　处：《天文学报》2024年第4期181-198,共18页Acta Astronomica Sinica

基　　金：Supported by the National Key R&D Program of China Grant No.2021YFC2203102 and 2022YFF0503404;by the National Natural Science Foundation of China Grants No.12173036,11773024;by the China Manned Space Project Grant No.CMS-CSST-2021-B01;by the Fundamental Research Funds for Central Universities Grants No.WK3440000004 and WK3440000005.

摘　　要：星系-星系透镜技术可用于研究星系大小与晕质量的相关性.按照星系大小、恒星质量和颜色将来自斯隆数字巡天第7次发布的数据(SDSS DR7)中的星系群样本的星系样本分为不同的子样本.通过对每个星系子样本的面密度超出进行建模以获得其晕质量.没有在红/蓝星系大小与晕质量之间观察到强相关性.红/蓝星系大小与晕质量关系的拟合斜率分别为0.0023_(0.0054)^+(0.0002)和-0.0237_(0.0108)^(+0.0004).通过使用Illustris-TNG(下一代Illustris项目)数据集提供的半质量半径,可以将观测的结果与Illustris-TNG的模拟结果进行比较.与观测不同的是,Illustris-TNG模拟的晕质量呈现出增加的趋势,这主要是由于恒星质量与星系大小之间存在正相关性.当晕质量除以恒星质量时,这种依赖性消失了,表明Illustris-TNG的模拟结果与观测的结果相似.The correlation between galaxy size and halo mass is meticulously examined through the application of galaxy-galaxy lensing techniques.The galaxy samples from Sloan Digital Sky Survey Data Release 7(SDSS DR7)group catalog are divided into different subsamples according to their sizes,stellar mass and color.The halo mass of each sub-sample is obtained by modeling the measured excess surface density.Blue or red galaxies do not exhibit a strong correlation between halo mass and galaxy size.The slope of the fitted halo mass to size relation for the blue and red sub-samples are0.0237_(0.0108)^+(0.0004)and-0.0023_(0.0054)^(+0.0002),respectively.The results are compared to those from the Illustris-TNG(The Next Generation Illustris project)hydrodynamic simulations,using the half-stellar mass radius provided by the database.Unlike the observations,the halo mass from simulations does show an increasing trend which mainly caused by the fact that there is positive correlation between stellar mass and galaxy size.While dividing the halo mass by the stellar mass causes this dependence to vanish,the results indicate a similarity to those obtained in this work.

关 键 词：引力透镜:弱 星系:晕 星系:基本参数 方法:数据分析 

分 类 号：P159[天文地球—天文学]