- #1
pi.rootpi
- 17
- 0
Hi, I have an image of a graphic describing the spectrum of a supernova Ia, the problem is that I don't really know how to read it. I'd like to know if there's any importance in this image that can drive us to think about dark energy (or accelerated expansion).
The explanation of the graph says:
Spectrum of SN 1997ap, after binning by 12.5 °A, placed within a time series of
spectra of “normal” SNe Ia 17,18,19,20,21 (the spectrum of SN 1993O was provided courtesy
of the Cal´an/Tololo Supernova Survey), as they would appear redshifted to z = 0.83. The
spectra show the evolution of spectral features between 7 restframe days before and 2 days
after restframe B-band maximum light. SN 1997ap matches best at 2 ± 2 days before
maximum light. The symbol [tex]\oplus{}[/tex] indicates an atmospheric absorption line and * indicates a region affected by night sky line subtraction residuals. The redshift of z = 0.83 ± 0.005 was
determined from the supernova spectrum itself, since there are no host galaxy lines detected.
Thanks for all!
And here you have the image:
The explanation of the graph says:
Spectrum of SN 1997ap, after binning by 12.5 °A, placed within a time series of
spectra of “normal” SNe Ia 17,18,19,20,21 (the spectrum of SN 1993O was provided courtesy
of the Cal´an/Tololo Supernova Survey), as they would appear redshifted to z = 0.83. The
spectra show the evolution of spectral features between 7 restframe days before and 2 days
after restframe B-band maximum light. SN 1997ap matches best at 2 ± 2 days before
maximum light. The symbol [tex]\oplus{}[/tex] indicates an atmospheric absorption line and * indicates a region affected by night sky line subtraction residuals. The redshift of z = 0.83 ± 0.005 was
determined from the supernova spectrum itself, since there are no host galaxy lines detected.
Thanks for all!
And here you have the image: