What Do Gas-Rich Galaxies Actually Tell Us about Modified Newtonian Dynamics?

被引：11

作者：

Foreman, Simon ^{[1
]}

Scott, Douglas ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 14期

基金：

加拿大自然科学与工程研究理事会;

关键词：

TULLY-FISHER RELATION; CLUSTER NGC 2419; ROTATION CURVES; STELLAR MASS; SPIRAL GALAXIES; DARK-MATTER; FEEDBACK; DWARF;

D O I：

10.1103/PhysRevLett.108.141302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It has recently been claimed that measurements of the baryonic Tully-Fisher relation (BTFR), a power-law relationship between the observed baryonic masses and outer rotation velocities of galaxies, support the predictions of modified Newtonian dynamics for the slope and scatter in the relation, while challenging the cold dark matter (CDM) paradigm. We investigate these claims, and find that (1) the scatter in the data used to determine the BTFR is in conflict with observational uncertainties on the data, (2) these data do not make strong distinctions regarding the best-fit BTFR parameters, (3) the literature contains a wide variety of measurements of the BTFR, many of which are discrepant with the recent results, and (4) the claimed CDM "prediction" for the BTFR is a gross oversimplification of the complex galaxy-scale physics involved. We conclude that the BTFR is currently untrustworthy as a test of CDM.

引用

页数：5

共 47 条

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