Setting Redshift/RV

The Line Lists Plugin contains a redshift slider as well as the ability to view and set the redshift and/or radial velocity.

From the notebook

The range of the slider, as well as the resolution of a single step in the slider, can be set from a notebook cell using the set_redshift_slider_bounds() method in specviz by specifying the range and/or step keywords. By setting either or both of these to ‘auto’, they will default based on the x-limits of the spectrum plot.

The redshift itself can be set from the notebook using the set_redshift method.

Any set redshift values are applied to spectra output using the jdaviz.configs.specviz.Specviz.get_spectra helper method. Note that using the lower-level app data retrieval (e.g., specviz.app.get_data_from_viewer()) will return the data as originally loaded, with the redshift unchanged.