期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 393, 期 3, 页码 885-893出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.14094.x
关键词
gravitation; gravitational lensing; galaxies: halos; dark matter
资金
- Science and Technology Facilities Council [PP/F000065/1, PP/D000890/1] Funding Source: researchfish
- STFC [PP/F000065/1, PP/D000890/1] Funding Source: UKRI
We study the amplitude of the weak gravitational lensing signal as a function of stellar mass around a sample of relatively isolated galaxies. This selection of lenses simplifies the interpretation of the observations, which consist of data from the Red-Sequence Cluster Survey and the Sloan Digital Sky Survey. We find that the amplitude of the lensing signal as a function of stellar mass is well described by a power law with a best-fitting slope alpha = 0.74 +/- 0.08. This result is inconsistent with modified Newtonian dynamics (MOND), which predicts alpha = 0.5 (we find alpha > 0.5 with 99.7 per cent confidence). As a related test, we determine the MOND mass-to-light ratio as a function of luminosity. Our results require dark matter for the most luminous galaxies (L greater than or similar to 10(11) L-circle dot). We rule out an extended halo of gas or active neutrinos as a way of reconciling our findings with MOND. Although we focus on a single alternative gravity model, we note that our results provide an important test for any alternative theory of gravity.
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