Minivoids in the Local Volume
| dc.creator | Tikhonov, A. V. | |
| dc.creator | Karachentsev, I. D. | |
| dc.date | 2006-09-05 | |
| dc.date.accessioned | 2026-07-07T10:39:59Z | |
| dc.date.available | 2026-07-07T10:39:59Z | |
| dc.description | We consider a sphere of 7.5 Mpc radius, which contains 355 galaxies with accurately measured distances, to detect the nearest empty volumes. Using a simple void detection algorithm, we found six large (mini)voids in Aquila, Eridanus, Leo, Vela, Cepheus and Octans, each of more than 30 Mpc^3. Besides them, 24 middle-size "bubbles" of more than 5 Mpc^3 volume are detected, as well as 52 small "pores". The six largest minivoids occupy 58% of the considered volume. Addition of the bubbles and pores to them increases the total empty volume up to 75% and 81%, respectively. The detected local voids look like oblong potatoes with typical axial ratios b/a = 0.75 and c/a = 0.62 (in the triaxial ellipsoide approximation). Being arranged by the size of their volume, local voids follow power law of volumes-rankes dependence. A correlation Gamma-function of the Local Volume galaxies follows a power low with a formally calculated fractal dimension D = 1.5. We found that galaxies surrounding the local minivoids do not differ significantly from other nearby galaxies on their luminosity, but have appreciably higher hydrogen mass-to-luminosity ratio and also higher star formation rate. We recognize an effect of local expansion of typical minivoid to be ΔH/H_0~(25+-15)%. | |
| dc.description | 23 pages, 18 figures. Astrophysical Journal, accepted | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0609109 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0609109 | |
| dc.identifier | Astrophys.J.653:969-976,2006 | |
| dc.identifier | doi:10.1086/508981 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/181223 | |
| dc.subject | Astrophysics | |
| dc.title | Minivoids in the Local Volume | |
| dc.type | text |