DRAINING THE LOCAL VOID

被引：20

作者：

Rizzi, Luca ^{[1
]}

Tully, R. Brent ^{[2
]}

Shaya, Edward J. ^{[3
]}

Kourkchi, Ehsan ^{[2
]}

Karachentsev, Igor D. ^{[4
]}

机构：

[1] WM Keck Observ, Kamuela, HI 96743 USA

[2] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

[3] Univ Maryland, Dept Astron, College Pk, MD 20743 USA

[4] Russian Acad Sci, Special Astrophys Observ, N Arkhz 369167, KChR, Russia

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 835卷 / 01期

基金：

俄罗斯科学基金会;

关键词：

galaxies: distances and redshifts; galaxies: dwarf; Hertzsprung-Russell and C-M diagrams; large-scale structure of universe; RED GIANT BRANCH; DISTANCE INDICATOR; DWARF GALAXY; RESOLVED GALAXIES; AVOIDANCE SURVEY; ACTION PRINCIPLE; ADVANCED CAMERA; NEARBY GALAXY; TIP; VELOCITY;

D O I：

10.3847/1538-4357/835/1/78

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Two galaxies that lie deep within the Local Void provide a test of the expectation that voids expand. The modest (M-B similar to -14) HI bearing dwarf galaxies ALFAZOAJ1952+ 1428 and KK246 have been imaged with Hubble Space Telescope in order to study the stellar populations and determine distances from the luminosities of stars at the tip of the red giant branch. The mixed age systems have respective distances of 8.39 Mpc and 6.95 Mpc and inferred line-of-sight peculiar velocities of -114. km s(-1) and -66. km s(-1) toward us and away from the void center. These motions compound on the Milky Way motion of similar to 230. km s(-1) away from the void. The orbits of the two galaxies are reasonably constrained by a numerical action model encompassing an extensive region that embraces the Local Void. It is unambiguously confirmed that these two void galaxies are moving away from the void center at several hundred km s(-1).

引用

页数：8

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