Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-02
Astronomy and Astrophysics
Astrophysics
10 pages, 6 figures, proceedings Symposium "Galaxies in the Local Volume", Sydney, 8 - 13 July 2007, B. Koribalski and H. Jerj
Scientific paper
After recent systematic optical, IR, and HI surveys, the total number of known galaxies within 10 Mpc has increased from 179 to 550. About half this Local Volume (LV) sample is now been imaged with HST, yielding the galaxy distances with an accuracy of about 8%. For the majority of the LV galaxies we currently have H-alpha fluxes that allow us to reconstruct the star formation history of our neighbourhood. For the late-type LV galaxies their HI masses and angular momentum follow the linear relation in the range of 4 orders, which is expected for rotating gaseous disks being near the gravitational instability threshold. The data obtained on the LV galaxies imply important cosmological parameters, in particular, the mean local matter density and HI mass density, as well as SFR density. Surprisingly, the local Hubble flow around the LV groups is very quiet, with 1D rms deviations of 25 km/s,which is a signature of the Universe vacuum-dominated on small scales. The cold infall pattern around nearby groups provides us with a new method to determine the total mass of the groups independent from virial mass estimates.
Huchtmeier Walter
Kaisin Serafim
Karachentsev Igor D.
Karachentseva Valentina
Makarov Dmitry
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