TAZ-interactive

Viewing DEVILS Spectra

The 'Visual Inspection' tab allows users to view spectra which have been observed by the AAT as part of the DEVILS project. This tool is linked directly to the DEVILS databas and is updated nightly with new observations, and as such can be used to visually inspect recently observed sources. The data displayed in this tool is propritery, and thus password protected. If you are not part of the DEVILS team and would like access, please contact us here .

Logging in

If you have a password, you can enter it into the boxes on the Visual Inspection tab:

There are two types of login for this tool. Firstly a generic DEVILS account that allows users to simply view all of the spectra, and secondly a user-specific account which also allows users to add visual classifications and comments to a personal log file; which TAZi will load each time you log in. These are both described below:

Generic DEVILS User

When logged in as a DEVILS user you will be presented with the flowing screen. Unsurprisingly, to view the first spectrum click on the "Start" button:

You will then be shown the first spectrum. This window displays the full selected spectrum and zoom in regions of key spectra features at the current best-fit redshift:

For the generic DEVILS user TAZi allows some functionality to examine the spectrum, from chaning the plotting window, smoothing, adding best-fit template, sky and variance spectra, to manually updating the plotted redshift. These are all highlighted in the figure above. **NOTE when zooming the black main spectra is zoomed and the template, sky and variance are dynamically scaled to sensible places with respect to the target spectrum**. Source parameters for the current spectrum are given in the top left corner of the page.

To navigate between spectra, you can use the 'Next spectrum' and 'Previous spectrum' buttons. In addition the 'Jump to ID' box allows you to display any observed source in the DEVILS sample(which can be found in the 'Position Search' tab). This box also auto completes and name resolves. Finally you can also use the '-' and '=' keys to move between spectra with just the keyboard.

Specific User

On top of the functionality described above, if you are logged into your personal account you will also be able to assign quality flags to each spectrum, mannualy record redshifts and add comments. These are then recorded in your own log file. Each time you log into TAZi it will laod your log file and display you previous flags/comments. TAZi will also initially load the last spectrum you were viewing. If logged in this way, you will see the following screen:

This page has additional options for assinging a new redshift based on the last clicked position (top), assinging a spectral flag (left) and adding a comment to the spectrum (below flags). These are saved when you leave the current spectrum. The user can also turn on and off number keys to assign spectral flags which may be useful when quickly looking through spectra.

Finding DEVILS Targets

The 'Position Search' tab allows users to identify which sources which currently have a DEVILS observation. These are useful for inputs into the 'Visual Inspection' tab.

Users can input an RA, DEC and radius, and find all DEVILS sources within the selected region. These are displayed as: Sources which have a pre-DEVILS redshift (blue triangles), source which are DEVILS targets but have not yet been observed (gold tringles), sources which have been observed by DEVILS but do not yet have a secure redshift (red circles), sources observed by DEVILS and have a secure redshift (green circles). The latter two of these can be input into the 'Visual Inpection' tab to pull up the DEVILS spectrum. An example of a position search is given below:

Below this image users are also presented with all DEVILS target RAs and DECs, and whether or not the target have been observed: