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information_for_astronomers:user_guide:faq
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information_for_astronomers:user_guide:faq [2014/03/19 13:43] bwinkel [Setup the instrument] |
information_for_astronomers:user_guide:faq [2019/08/10 21:54] (current) akraus |
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| ===== Preparation ===== | ===== Preparation ===== | ||
| === How do I get to Effelsberg === | === How do I get to Effelsberg === | ||
| + | [[information_for_astronomers:user_guide:hints|Observing at Effelsberg]]. | ||
| + | === Contacting the operators === | ||
| + | |||
| + | The control room can be reached by phone via +49 2257 301 155. The operator's | ||
| + | mail address is operateure_at_mpifr.de . | ||
| + | |||
| + | === What receivers/instruments do you got? === | ||
| + | Please have a look into our [[information_for_astronomers:rx_list|RX list]]. | ||
| === How can I get my sources into the system (prepare catalogs)? === | === How can I get my sources into the system (prepare catalogs)? === | ||
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| ===== Previewing the data ===== | ===== Previewing the data ===== | ||
| === I did continuum maps. Is there a way to preview them? === | === I did continuum maps. Is there a way to preview them? === | ||
| + | Actually, there are even two ways. Observers familiar with the 100-m often use the [[information_for_astronomers:user_guide:reduc_maps|Toolbox in combination with NOD2/3]]. This involves a bit of handcrafting, so if you're new or really just need a quick preview, have a look at our new [[information_for_astronomers:user_guide:pyonlplot|Online Plotter]], which in fact can be used as an Offline Plotter, as well ;-). | ||
| === How can I have a look into my spectral data, to check if everything is ok? === | === How can I have a look into my spectral data, to check if everything is ok? === | ||
| + | Again, you could use the [[information_for_astronomers:user_guide:pyonlplot|Online Plotter]] for a preview, but most people will prefer to use ''Gildas/Class'' for this task. Our class pipeline runs on ''observer2'' and ''observer4'', so for a timely access log-in to this machine. Files will be located in ''/data/Class''. See [[information_for_astronomers:user_guide:reduction_of_spectroscopic_measurements|"reduction of spectroscopic measurements"]] for details. | ||
| ===== Obtaining the data ===== | ===== Obtaining the data ===== | ||
| === Where is the data stored? === | === Where is the data stored? === | ||
| + | Raw data files (in FITS format) are originally stored in ''/daten/Raw'' on ''be4'', but this directory is NFS-mounted on most user machines (e.g., ''observer2'' and ''observer4''. The latter runs the ''Class'' pipeline to produce the spectroscopy files in ''Gildas'' format. So, if you only want these, you should use ''observer4'' to read the data located in ''/daten/Class''. | ||
| + | |||
| + | [[information_for_astronomers:user_guide:data_storage_and_archive]] | ||
| + | |||
| === How do I copy them to my place? === | === How do I copy them to my place? === | ||
| + | The preferred method is to use ''scp'' to copy it via ethernet. If you must, the operators can also plug your USB-stick into one of the observer machines to copy things over. | ||
| + | === Are the data already calibrated? === | ||
| + | No! (see below) | ||
| ===== Calibrating and analyzing the data ===== | ===== Calibrating and analyzing the data ===== | ||
| === What steps are necessary to calibrate my data? === | === What steps are necessary to calibrate my data? === | ||
| - | + | The FITS files contain the Raw data (pure counts), while the "reduced" spectra and continuum scans contained in the ''Class'' files are only partly calibrated by the pipeline. In fact, the pipeline removes the gain factor ("bandpass") from the data using the position-switch or frequency-switch technique, but the result is in units of the noise diode's signal, $T_\mathrm{cal}$. You have to use calibration sources to measure $T_\mathrm{cal}$. For quick'n'dirty calibration you can use values from our [[information_for_astronomers:rx_list|RX list]]. Furthermore, depending on observing frequency you will need to correct for elevation-dependent gain efficiency and atmospheric opacity. Details are discussed in a calibration memo by A. Kraus (on request) and partly in [[http://adsabs.harvard.edu/abs/2012arXiv1203.0741W| A&A 540, A140, 2012]]. | |
information_for_astronomers/user_guide/faq.1395233032.txt.gz · Last modified: 2014/03/19 13:43 by bwinkel
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