arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2406.09685astro-ph.GAastro-ph.COgr-qc
收藏

来自弱引力透镜的无限平坦圆周速度与重子塔利-费舍尔关系

Indefinitely Flat Circular Velocities and the Baryonic Tully-Fisher Relation from Weak Lensing

Tobias Mistele, Stacy McGaugh, Federico Lelli, James Schombert, Pengfei Li

AI总结:

本研究利用新反投影公式通过弱引力透镜分析孤立星系引力势,发现圆周速度曲线平坦范围远超暗物质晕位力半径,且质量与平坦速度的关联符合重子塔利-费舍尔关系,适用于各类星系。

摘要:

我们采用一种新的反投影公式,通过弱引力透镜推断孤立星系周围的引力势。结果表明,圆周速度曲线在数百千秒差距(kpc)范围内保持平坦,极大拓展了21厘米观测得到的经典结论。实际上,在延伸至1百万秒差距(Mpc)处仍无明显下降迹象,远超暗物质晕的预期位力半径。按质量对数据分箱后发现,平坦圆周速度的相关性与运动学数据已知的Baryonic Tully-Fisher Relation(重子塔利-费舍尔关系)高度吻合。这些结果同时适用于早型和晚型星系,表明存在共同的普适行为。

英文摘要:

We use a new deprojection formula to infer the gravitational potential around isolated galaxies from weak gravitational lensing. The results imply circular velocity curves that remain flat for hundreds of kpc, greatly extending the classic result from 21 cm observations. Indeed, there is no clear hint of a decline out to 1 Mpc, well beyond the expected virial radii of dark matter halos. Binning the data by mass reveals a correlation with the flat circular speed that closely agrees with the Baryonic Tully-Fisher Relation known from kinematic data. These results apply to both early and late type galaxies, indicating a common universal behavior.

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。

↑