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Notes: Followup of 15229 Notification:
Date: Wed, 30 Jun 2004 14:16:42 GMT From: doronl@wise1.tau.ac.il To: xmmhelp@xmm.vilspa.esa.es CC: doronl@wise1.tau.ac.il Subject: rgsproc task / enlarging the extraction region.
Full_Name: Doron Lemze Submission from: (NULL) (132.66.16.12) Dear colleague, Thank you for the quick and straight to the point answer about how to enlarge the extraction region. However there are still some unclear issues in my mind. I have two questions. 1) I understood that in order to enlarge the extraction region of the cross-dispersion I need to enlarge the percentage of the cross-dispersion PSF. I do it by changing the following parameters: xpsfbelow, xpsfabove, and xpsfexcl. I know the size of of my extended source and I look for an easy way of converting the angular size of it, let us say 2 arcmin, to the percentage of the cross-dispersion PSF. I don't want to 'try and check'. It is important to mention that my source is weak, so I can't see it in the plot. How can I convert it from angular size to the percentage of the cross-dispersion PSF ? 2) In order to enlarge the extraction region I need to write the following commands: rgsregions srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \ evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \ xpsfbelow=95 xpsfabove=95 xpsfexcl=98 rgsspectrum evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \ srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \ bkgcorrect=yes as is written in the threads. However I used to run the rgsproc as a whole, and not the 5 stages separately. The parameters: xpsfbelom, xpsfabove, and apsfexcl, which are parameters of rgsregions, are not parameters of rgsproc (I don't know why). I don't want to run the 5 stages separately. How can I enlarge the extraction region with running the rgsproc ? Thank you a lot, Doron.
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es> To: doronl@wise1.tau.ac.il Subject: Re: rgsproc task / enlarging the extraction region. (PR#15246) Date: Thu Jul 1 08:02:05 2004
Dear Doron, > 1) I understood that in order to enlarge the extraction region of the > cross-dispersion I need to enlarge the percentage of the cross-dispersion PSF. I > do it by changing the following parameters: xpsfbelow, xpsfabove, and xpsfexcl. > I know the size of of my extended source and I look for an easy way of > converting the angular size of it, let us say 2 arcmin, to the percentage of the > cross-dispersion PSF. I don't want to 'try and check'. It is important to > mention that my source is weak, so I can't see it in the plot. How can I convert > it from angular size to the percentage of the cross-dispersion PSF ? I am afraid that there is not any straightforward way to estimate the percent of the PSF in terms of spatial extension. I can only tell you that 90% corresponds roughly to 1 arcmin and 97% to 2 arcmin, but you have to take into account that the width of the PSF depends on the wavelength, i.e. it is narrower for longer wavelengths. > 2) In order to enlarge the extraction region I need to write the following > commands: > rgsregions srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \ > evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \ > xpsfbelow=95 xpsfabove=95 xpsfexcl=98 > > rgsspectrum evlist='PxxxxxxyyyyR1eeeeEVENLI0000.FIT' \ > srclist='PxxxxxxyyyyR1eeeeSRCLI_0000.FIT' \ > bkgcorrect=yes > > as is written in the threads. > > However I used to run the rgsproc as a whole, and not the 5 stages separately. > The parameters: xpsfbelom, xpsfabove, and apsfexcl, which are parameters of > rgsregions, are not parameters of rgsproc (I don't know why). I don't want to > run the 5 stages separately. How can I enlarge the extraction region with > running the rgsproc ? Please note that, unless you change the coordinates of the source you do not need to run all the five stages of rgsproc, just to start in 'angles'. The parameters that control the size of the extraction mask are in the 'spectra' tab of rgsproc: xpsfincl is equivalent to xpsfbelow and xpsfabove, assuming the same value for both. xpsfexcl is the limit for background computation (as in rgsregions). You can change them and start rgsproc at the 'spectra' stage. Hope this information is useful, Regards Rosario
Date: Sun, 11 Jul 2004 13:57:47 +0300 (IDT) From: Doron Lemze <doronl@wise1.tau.ac.il> Subject: Re: rgsproc task / enlarging the extraction region. (PR#15246) To: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
Thank you very much for your quick, and clear answer. Cheers, Doron.