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Josep Maria Masque <jmasque@astro.ugto.mx> </td>
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Awaiting Agent
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Hello, Me and my student are trying to obtain spectra with the task ispec from data of the IRAM 30m telescope and later converted to fits format. While the data cube is displayed and an...
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<div>Hello,</div><div><br></div><div>Me and my student are trying to obtain spectra with the task ispec from data of the IRAM 30m telescope and later converted to fits format. While the data cube is displayed and analyzed correctly by most of the AIPS tasks, including ispec, when we run xgauss to fit spectra taking the same box as used in ispec, we get different spectra on the display. Our procedure: first, we reorder axis with TRANS task (i.e. set velocity axis as first axis); then we set the BLC and TRC parameters consistent with those used in ispec for the original datacube. </div><div><br></div><div>Does trans task perform additional actions on the data cube, besides reordering axes (e.g., interpolation between pixels)?</div><div><br></div><div>I attach an screenshot showing the theoretically same spectrum (over equivalent BCL and TRC between original and transposed datacubes). The right panel corresponds to the xgauss outcome and the left panel shows the same but for ispec. Note that the respective lines have coincident velocities, but have different shapes and intensities. In other cases we found pure noise with xgauss where a line is clearly seen with ispec. </div><div><br></div><div>Best regards,</div><div>Josep M. and Raquel </div><div><br></div><div>ps. Let us know if you need more details; the used OS is ubuntu 20.04; we attempted the above mentioned analysis with Linux Mint 20, too </div>
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