![]() ![]() The other goal is to dymystify the reduction of spectra and unchain the enthusiastic amateur from their black-box to let them understand and take more control of how their data is reduced. One goal of this tutorial is to de-mystify that process and make amateurs as confortable with reducing spectra as they are with reducing CCD images or photometry. But to do real science, it helps to understand exactly how the data are gathered.įor most amateurs, their spectrograph might come with some canned software that is for all intents and purposes a black box that you put the CCD images from the spectrograph in one end and get one-dimensional spectra out the other with no hint of what happens in-between. This opens up a whole new domain for citizen science. Introduzione e principali comandi del software Xspec necessari per l'analisi spettrale dei dati X.Amateur astronomers have increasingly better access to affordable spectrographs they can use with their telescope to take spectra of objects in the night sky. ![]() Walks through XSPEC: introduzione all’uso dei comandi principali. The specextract script automates these steps for extended and point-like sources observed with the ACIS detector. The appropriate Response Matrix Files (RMFs) and Ancillary Response Files (ARFs) are created for both source and background. The background spectrum is grouped, if desired. This thread expands upon the basic overview of using parameter files available from the Parameter Files section of the Introduction to CIAO thread.Įxtract spectrum and response files for point-like (and extended) sources: Using a combination of CIAO tools, we extract source and background spectra for a point-like source. The parameter file interface provides great flexibility in specifying parameters to programs, since their values can be obtained either from the command line or from a parameter file. Using parameter files : The CIAO tools use ASCII parameter files to get and store processing parameters. Developed independently of the software, ds9 contains some CIAO-specific support. Using SAO Image ds9 : The imaging application SAOImage ds9 is distributed with CIAO as the default imager. We recommend to the "CIAO" region format as it is supported by all of the CIAO data analysis tools. This thread describes how regions are defined, how they are used, and the caveats associated with their use. Using CIAO region files : Regions two-dimensional filters used to include and exclude data are commonly used in CIAO data analysis. The filtered output can either be saved or input directly to an analysis task as a "virtual file." A brief introduction to the Data Model interface and examples on how to use the four core tools are provided here. Introduction to the data models : The CIAO Data Model is a versatile interface used to examine standard format datafiles (FITS, IMH) it also allows powerful filtering of datafiles. Filenames given in brackets - e.g. - indicate a data product that is not created for ACIS imaging observations this makes the thread applicable to any standard Chandra data distribution. This thread examines the primary and secondary Chandra data products where were obtained by following the How to Download Chandra Data from the Archive thread, which uses ObsID 1843 (ACIS-I, G21.5-0.9) as the sample data. A well-defined set of data products are the result of each level. This procedure is commonly referred to as "the pipeline." The processing runs in several stages or "levels”, each of which is built on the results of the preceding level. Introduction to the data products: The CXC performs standard data processing (SDP) on all Chandra science data. XMM-Newton Users Handbook : informazioni sulla strumentazione a bordo del satellite XMM-Newton XMM-Newton threads : principali istruzioni per la riduzione dei dati XMM-Newton (EPIC pn, MOS1, MOS2) XMM-Newton ABC Guide : manuale completo per la riduzione dei dati del satellite XMM-Newton Auricchio)ĪGILE and gamma-ray analysis tutorial (A.
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