1. Overview

This is a tutorial for the reduction of GMOS longslit spectroscopic data with DRAGONS.

GMOS is an imager and spectrograph offering longslit spectroscopy, multi-object spectroscopy (MOS), and integral field spectroscopy. This tutorial focuses on the longslit spectroscopy. For a tutorial on the reduction of GMOS imaging data, see GMOS Imaging Data Reduction Tutorial.

Here is a tutorial that you, the reader, can run and experiment with. This document comes with a downloadable data package that contains all the data you need to run the example presented. Instructions on where to get that package and how to set things up are given in Downloading tutorial datasets.

The GMOS longslit tutorial series, for now, contains only one scientific example, the reduction of an observation of a single stellar source with dither in both wavelength and spatial direction.

The reduction can be done in two different ways:

• From the terminal using the command line.

• From Python using the DRAGONS classes and functions.

We show how to run the same reduction using both methods.

• Example 1 - Longslit Dithered Point Source

• Example 2 - Longslit large-dither point source

• Example 3 - Nod-and-Shuffle Point Source

• Example 4 - Nod-and-Shuffle Correct for Extra Order

More examples will be added in the future.

See the DRAGONS Installation Instructions to install the software if you have not already.