4th Blog Post: HST Grism

This week, we have primarily been creating and analysing fake spectra. This involves creating a noise spectrum, with no obvious peaks that stand out. We also create a spectrum that is perfectly smooth aside from one gaussian peak at the wavelength of the ion at which we are looking. We then combine these two spectra together to show what a “perfect” spectrum would look like. By changing the flux on the gaussian curve, we can change the height of its peak. We continue to change the height until the peak blends into the background. This input flux is then our limiting flux. If we have an emission line coming from CR7 with a flux smaller than this limiting flux, we will not notice it, and therefore assume that the ion isn’t present. We repeated this for all the ions of interest that had emission lines in the correct wavelength range.

Creating a ‘fake spectra’ by combining a gaussian peak with background noise signals.

Using these results, we attempted to mimic the spectra of CR7 and BR3. This meant we could see what ions we could potentially be missing, and account for these in our end results.

Since this week is our penultimate week, we started writing up a presentation and report to summarise our findings. We will show the presentation at a mock conference, designed to emulate a professional conference environment. This means we have to successfully pull our results together, so Project 2 and Project 3 will be coalescing, since they are closely related.

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