Local Volume 中星系的运动距离
摘要
We consider the kinematic distances to nearby galaxies obtained by the Numerical Action Method (NAM) based on the Cosmic-flow-3 survey data. NAM distances are compared with 418 high-precision distances measured by the Tip of the Red Giant Branch (TRGB) method using the Hubble Space Telescope. We estimated the average difference <D_NAM - D_TRGB> = -0.30 +- 0.08 Mpc and the standard deviation of 1.57 Mpc. Approximately the same difference in the distance scale is obtained in comparison with less accurate distance estimates through the membership of galaxies in known groups or from the Tully-Fisher relation. We conclude that the NAM method provides distance estimates with an accuracy of 20% within the Local Volume, which is valid for ~90% of the sky, except for the regions of the Virgo cluster and the Coma-I group.
关键词
引用
@article{arxiv.2412.03988,
title = {Kinematic distances of galaxies in the Local Volume},
author = {I. D. Karachentsev and A. A. Popova},
journal= {arXiv preprint arXiv:2412.03988},
year = {2024}
}
备注
7 pages, 2 figures, 2 tables, accepted for publication in Astrophysics