首页|星系-星系透镜效应下星系大小与晕质量的相关性

星系-星系透镜效应下星系大小与晕质量的相关性

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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+0.0002-0.0054和0.0237+0.0004-0.0108.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 from Galaxy-galaxy Lensing
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 sub-samples 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 are 0.0237+0.000008-010108 and-0.0023+0.0002-0.00524,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.

gravitational lensing:weakgalaxies:halosgalaxies:fundamental parametersmethods:data analysis

闫大伟、王晴晴、张聪聪、罗文涛、方文娟、张育飞、李佳迅

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中国科学技术大学物理学院天文系 合肥 230026

中国科学技术大学天文与空间科学学院 南京 210023

乐山师范学院数理学院 乐山 614000

引力透镜:弱 星系:晕 星系:基本参数 方法:数据分析

National Key R&D Program of ChinaNational Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Manned Space ProjectFundamental Research Funds for Central UniversitiesFundamental Research Funds for Central Universities

2021YFC22031022022YFF05034041217303611773024CMS-CSST-2021-B01WK3440000004WK3440000005

2024

10.15940/j.cnki.0001-5245.2024.04.011

天文学报
中国天文学会

天文学报

CSTPCD北大核心
影响因子：0.339
ISSN：0001-5245
年,卷(期)：2024.65(4)