Emergent Gravity Fails to Explain Color-dependent Galaxy–Galaxy Lensing Signal from SDSS DR7
Emergent Gravity Fails to Explain Color-dependent Galaxy–Galaxy Lensing Signal from SDSS DR7
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DOI：
10.3847/1538-4357/abf4c2
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
Wentao Luo;Jiajun Zhang;V. Halenka;Xiaohu Yang;S. More;C. Miller;Lei Liu;F. Shi
中科院分区：
文献类型：
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作者：
Wentao Luo;Jiajun Zhang;V. Halenka;Xiaohu Yang;S. More;C. Miller;Lei Liu;F. Shi
我们使用基于斯隆数字巡天DR7数据的星系-星系透镜技术测试Verlinde的涌现引力（EG）理论。在EG情景中，我们不期望在EG预测的表观暗物质中星系样本的颜色依赖，这仅仅是由重子质量施加的。如果重子质量相似，那么根据EG，无论星系样本的颜色如何，重子质量预测的透镜轮廓都应该相似。我们用星系的恒星质量来代替它的重子质量。我们将银河系样本分成五个恒星质量仓，并在每个恒星质量仓中进一步划分为红色和蓝色亚样本。如果我们将光晕质量和浓度作为自由参数，我们的数据在χ 2化简方面更倾向于ΛCDM，而EG无法解释星系-星系透镜测量中多余表面密度的颜色依赖性。
We test Verlinde’s Emergent Gravity (EG) theory using a galaxy–galaxy lensing technique based on Sloan Digital Sky Survey DR7 data. In the EG scenario, we do not expect a color dependence of the galaxy sample in the apparent dark matter predicted by EG, which is exerted only by the baryonic mass. If the baryonic mass is similar, then the predicted lensing profiles from the baryonic mass should be similar according to EG, regardless of the color of the galaxy sample. We use the stellar mass of the galaxy as a proxy of its baryonic mass. We divide our galaxy sample into five stellar mass bins, and further classify them as red and blue subsamples in each stellar mass bin. If we set the halo mass and concentration as free parameters, ΛCDM is favored by our data in terms of the reduced χ 2, while EG fails to explain the color dependence of the excess surface density from the galaxy–galaxy lensing measurement.