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首页> 外文期刊>The Astrophysical journal >SLOWLY ROTATING GAS-RICH GALAXIES IN MODIFIED NEWTONIAN DYNAMICS (MOND)
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SLOWLY ROTATING GAS-RICH GALAXIES IN MODIFIED NEWTONIAN DYNAMICS (MOND)

机译:修改牛顿动力学(MOND)中的慢旋转富气星系

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We have carried out a search for gas-rich dwarf galaxies that have lower rotation velocities in their outskirts than MOdified Newtonian Dynamics (MOND) predicts, so that the amplitude of their rotation curves cannot be fitted by arbitrarily increasing the mass-to-light ratio of the stellar component or by assuming additional undetected matter. With presently available data, the gas-rich galaxies UGC 4173, Holmberg II, ESO?245-G05, NGC?4861, and ESO?364-G029 deviate most from MOND predictions and, thereby, provide a sample of promising targets in testing the MOND framework. In the case of Holmberg II and NGC?4861, we find that their rotation curves are probably inconsistent with MOND, unless their inclinations and distances differ significantly from the nominal ones. The galaxy ESO?364-G029 is a promising target because its baryonic mass and rotation curve are similar to Holmberg?II but presents a higher inclination. Deeper photometric and H I observations of ESO?364-G029, together with further decreasing systematic uncertainties, may provide a strong test to MOND.
机译:我们已经进行了搜索,发现其郊区的旋转速度低于现代牛顿动力学(MOND)预测的气体富集矮星系,因此不能通过任意增加质光比来拟合其旋转曲线的振幅恒星成分或通过假设其他未发现的物质。根据目前可获得的数据,富含气体的星系UGC 4173,Holmberg II,ESO?245-G05,NGC?4861和ESO?364-G029与MOND的预测大不相同,从而提供了一个有希望的目标样品来测试MOND框架。在Holmberg II和NGC?4861的情况下,我们发现它们的旋转曲线可能与MOND不一致,除非它们的倾角和距离与标称的倾角和距离明显不同。 ESO?364-G029是一个有前途的目标,因为它的重子质量和旋转曲线与Holmberg?II相似,但倾斜度更高。对ESO?364-G029的更深入的光度学和H I观测,以及进一步降低的系统不确定性,可能为MOND提供有力的检验。

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