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I am playing with Marz to fit the redshift of some JWST spectra. The powerful JWST enables the discovery of amounts of high-redshift galaxies. Marz is very helpful at this and saves lots of time in identifying the redshift. But it seems Marz cannot estimate the redshift of very high-redshift galaxies (z>6), even though the spectrum shows very clear features (see the figure, very significant OIII + Hbeta lines). I am wondering if there is a redshift limit in the code because I noticed that the maximum redshift allowance in the GUI is 5. If so, is there a method to close this limit?
Secondly, I am wondering if it is possible to add some templates, because the JWST data now provides coverage of the rest-frame NIR wavelength.
Any help would be very appreciated.
Best,
Weida
The text was updated successfully, but these errors were encountered:
Happy to hear the tool is still useful after all these years! You're right in that there's a redshift limit. The UI limit comes from the way the cross correlation works, which involves rebinning input spectra onto a log-linear wavelenth grid and then calculating the cross correlations against templates.
(Note that the two vaules with "Q" at the end are used for quasar templates, and you'll see their ending wavelength goes to up to 10^4.6 as opposed to the normal specta which go up to 10^4.2.
Increading this value will allow templates to match to higher redshifts. If you increase a lot, you might also want to enable finer rebinning (which means uncommenting line 61 and commenting line 62)
Now, I can't make those changes in the default version of marz, as it will change the behaviour for existing users, but hopefully it's a simply process to fork the repository and change things as youd like, especially given GitHub pages is how I host the code to turn it into a webpage, and its free!
Dear Sam,
I am playing with Marz to fit the redshift of some JWST spectra. The powerful JWST enables the discovery of amounts of high-redshift galaxies. Marz is very helpful at this and saves lots of time in identifying the redshift. But it seems Marz cannot estimate the redshift of very high-redshift galaxies (z>6), even though the spectrum shows very clear features (see the figure, very significant OIII + Hbeta lines). I am wondering if there is a redshift limit in the code because I noticed that the maximum redshift allowance in the GUI is 5. If so, is there a method to close this limit?
Secondly, I am wondering if it is possible to add some templates, because the JWST data now provides coverage of the rest-frame NIR wavelength.
Any help would be very appreciated.
Best,
Weida
The text was updated successfully, but these errors were encountered: