On the kinematics of the Local cosmic void

Details On the kinematics of the Local cosmic void On the kinematics of the Local cosmic void

2010-11-27

arxiv.org/abs/1011.5985v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Version 1. 14 pages, 8 figures, 2 tables. Accepted to Astrophysics, Volume 54, Issue 1

Scientific paper

We collected the existing data on the distances and radial velocities of galaxies around the Local Void in the Aquila/Hercules to examine the peculiar velocity field induced by its underdensity. A sample of 1056 galaxies with distances measured from the Tip of the Red Giant Branch, the Cepheid luminosity, the SNIa luminosity, the surface brightness fluctuation method, and the Tully-Fisher relation has been used for this purpose. The amplitude of outflow is found to be ~300 km/s. The galaxies located within the void produce the mean intra-void number density about 1/5 of the mean external number density of galaxies. The void's population has a lower luminosity and a later morphological type with the medians: M_B = -15.7^m and T = 8 (Sdm), respectively.

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