I am trying to calculate the Equivalent Width of emission lines of a spectrum whose continuum is at 0, making the calculation of the EW impossible.

I have the spectrum of a transient in a galaxy, so I am subtracting the galactic spectrum to study the emission lines, but, by doing so, the continuum level of the resulting spectrum is at 0. I am fitting the lines with multiple gaussians and calculating the EW as flux/continuum, but being the continuum around 0 the EW values become gigantic.

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    $\begingroup$ Don't subtract the continuum ! $\endgroup$ – Rob Jeffries Nov 28 '19 at 20:37
  • $\begingroup$ I have to subtract the continuum to have the "pure" transient spectrum, rather than transient+galaxy $\endgroup$ – Polemarco Nov 29 '19 at 9:17
  • $\begingroup$ Well then if there really is no continuum then equivalent width is meaningless. $\endgroup$ – Rob Jeffries Nov 29 '19 at 10:31

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