arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.2280astro-ph.CO
收藏

星系光度函数和Tully-Fisher关系:通过旋转曲线研究的协调

Galaxy luminosity function and Tully-Fisher relation: reconciled through rotation-curve studies

Andrea Cattaneo, Paolo Salucci, Emmanouil Papastergis

摘要:

星系光度L和晕维里速度v_vir之间的关系需要拟合星系光度函数不同于观察到的L和盘速度v_rot之间的Tully-Fisher关系。因此,从半解析模型建立之初,如何同时再现星系光度函数和塔利-费雪关系就一直是困扰着它们的难题。本文通过拟合观测到的盘状星系的平均自转曲线,研究了v_rot和v_vir之间的关系。我们表明,我们以这种方式获得的v_rot - v_vir关系可以完全解释这种表面上的不一致性。因此,光度函数与塔利-费希尔关系的调和依赖于v_rot对v_vir的复杂依赖性,这是因为恒星质量与暗物质质量的比值是晕质量的强函数。

英文摘要:

The relation between galaxy luminosity L and halo virial velocity v_vir required to fit the galaxy luminosity function differs from the observed Tully-Fisher relation between L and disc speed v_rot. Hence the problem of reproducing the galaxy luminosity function and the Tully-Fisher relation simultaneously has plagued semianalytic models since their inception. Here we study the relation between v_rot and v_vir by fitting observational average rotation curves of disc galaxies binned in luminosity. We show that the v_rot - v_vir relation that we obtain in this way can fully account for this seeming inconsistency. Therefore, the reconciliation of the luminosity function with the Tully-Fisher relation rests on the complex dependence of v_rot on v_vir, which arises because the ratio of stellar mass to dark matter mass is a strong function of halo mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑