Example of an observed spectrum with S ! N ~ 20, R ≃ 350 of a SLSN-I at various redshifts (0.5 <z< 2.5). The spectrum is that of iPTF13ajg at peak epoch (Vreeswijk et al. 2014) with a flux of ~ 10-16 erg s-1 cm-2 Å-1 at Y-band wavelength and at redshift z = 0.5, which should be feasible for the Euclid “blue” grism (see text). The cyan, yellow and red solid lines represent the wavelength regions covered by Euclid VIS, Y and J filters, respectively (we note that VIS and Y are superimposed for 600 Å). The blue region shows the Euclid “blue” grism covering 0.92 to 1.25 microns. The spectra at z> 0.5 show the potential of future facilities (e.g. JWST, E-ELT) and their use in identifying SN features, since they will go deeper and with a better resolution than the Euclid spectrograph.
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