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We present Multiple Mirror Telescope (MMT) and Keck II
telescope spectrophotometry and 3.5m Calar
Alto telescope R, I photometry of the western component of the extremely
low-metallicity blue compact galaxy SBS 0335-052. Both
components, separated by 22 kpc, resemble a unique, physically connected
system. It is shown that the new component, SBS 0335-052W, consists
of at least of three stellar clusters and has the same redshift
as SBS 0335-052. The oxygen
abundance in its two brightest knots is
extremely low, 12 + log (O/H) = 7.220.03 and 7.13
0.07,
respectively. These values are lower than in SBS 0335-052 and
are nearly the same as those in I Zw 18.
The (R-I) color profiles are very blue in
both galaxies due to the combined effects of ionized gas and a young stellar
population emission. We argue that SBS 0335-052W is a good candidate for
a nearby, young dwarf galaxy.
galaxies: abundances -- galaxies: irregular -- galaxies: photometry -- galaxies: evolution -- galaxies: formation -- galaxies: ISM -- HII regions -- ISM: abundances