A recent discovery of bright nebular gas
I Zw 18
has raised problems for galaxy formation models. This dwarf galaxy
is close enough to distinguish nebular gas emissions from star
light. The emissions result from heavy supernova activity that is
usually associated with heavy star formation as extremely large
stars are thought to die quickly. These nebular gas emissions are as
bright as the stars in the galaxy it self and extend beyond the edge
of the galaxy making it seem larger than it really is.
What this means for galaxy formation models is
that some distant galaxies thought to be fully formed may not be but
look that way do to surrounding nebular gas emissions. It needs to
be noted that this discovery is only a problem for standard models
of galaxy formation since they assume the accuracy of standard star
formation models and their subsequent development.
This discovery also raise some questions for
Creationist models that assume these galaxies are seen fully formed.
This discovery is consistent with both
Halton Arp’s work and
John Hartnett creation science version of it. This is the case
since according to both these models many if not of these galaxies
would be nearer than in other models and they would still be under
Dwarf Galaxy Questions Current Galaxy Formation Models