Starforming area or pea?
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The spectrum of the bright blue object near the center seems exactly like that of a pea. It has the same z as the spiral.
Is it a very active starforming area or might it actually be a pea? ( or both phenomenon generate equal spectra)
Spectrum of blue object
EDIT other pic host
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NED reference http://ned.ipac.caltech.edu/cgi-bin/ex_refcode?refcode=2010MNRAS.403..896P suggests
"The scatter and shift of the SDSS HII regions in the t2,O-t3,O diagram can be understood if they are composite nebulae excited by two or more ionizing sources of different temperatures"
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