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How do I analyse a PACS spectrum of a point source?
Posted by Mark Kidger, Last modified by Mark Kidger on 13 September 2018 02:34 PM
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Before going further, there are two excellent starting points for learning how to use PACS spectroscopy data. We recommend strongly that, if you are unfamiliar with PACS spectroscopy, you start by reading the Quick Start Guide to Spectroscopy (also known as the PACS Data Reduction Launchpad: Spectroscopy), which summarises the PACS spectroscopy observing modes, data products, calibration uncertainties and science-readiness of the different PACS spectroscopy products. There is also a Herschel Science Centre short videotutorial called Starting with PACS Spectroscopy, which will walk you through the basics of PACS Spectroscopy. You can find the short videotutorial here: https://www.youtube.com/watch?v=rcY487Z9Kyg If you are already familiar with these items and are ready to advance to the next stage, there are two further documents that you should read (or, at least, have to hand) that give essential background: The PACS Products Explained and the Product Decision Tree, knowledge of both is implicit in other documents and training materials. These and other interesting documents are in the PACS section of the Herschel Explanatory Legacy Library (HELL). There is a Herschel Science Centre short videotutorial that will guide you through the basics of the process of working with PACS spectra, giving you the knowledge essential to work with them. You can find it here: https://www.youtube.com/watch?v=nYWTccEQz_M The short videotutorial will explain what is meant by point source spectroscopy and the caveats and corrections that need to be applied, showing the footprint of the PACS Integral Field Unit on a typical point source, showing the re-binned and interpolated cubes that are an essential intermediate step in PACS spectroscopy reduction. It will show you the main keywords to look for to know the observing mode and how to determine where the point source is in the field of view for different observing modes, which is essential information for knowing which case to apply in data reduction and which product you need to use. It will then show you how to decide which HIPE task or script to use for different cases, depending on where the target is located in the field of view. According to the source centering case that you find, you should then continue with one of the two specialist short videotutorials that deal with the different special cases: Point sources in the central 3x3 spaxels. Point sources in the central spaxel. | |
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