Accretion of low-metallicity gas by the Milky Way

Authors :: Wakker, B.P.
Howk, J.C.
Savage, B.D.
van Woerden, H.
Tufte, S.L.
Schwarz, U.J.
Benjamin, R.
Reynolds, R.J.
Peletier, R.F.
Kalberla, P.M.W.
Source :: Nature. Nov 25, 1999, Vol. 402 Issue 6760, p388, 3 p.
Publication Year :: 1999
Abstract: Observed abundances of elements heavier than helium may require a continuous infall of gas with metallicity around 0.1 times the solar value. In the distant Universe, low-metallicity hydrogen clouds are sometimes observed near galaxies. A metallicity of 0.09 times solar is reported for a massive cloud that is falling into the disk of the Milky Way.