PFS-JIRA https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 [PIPE2D-364] Extrapolate the AMBRE library to 1260 nm https://pfspipe.ipmu.jp/jira/browse/PIPE2D-364 DRP 2-D Pipeline <p>The AMBRE library provides high-resolution stella spectra over the range of 300-1200 nm. Extend this to the upper end of the PFS NIR coverage of 1260 nm</p> PIPE2D-364 Extrapolate the AMBRE library to 1260 nm Task Normal Done Done Takuji Yamashita hassan Tue, 19 Feb 2019 16:44:11 +0000 Mon, 22 Apr 2019 08:13:45 +0000 Fri, 5 Apr 2019 14:58:34 +0000 0 4 <p>I believe that we hoped to get the stellar atmosphere modellers to extend the wavelength coverage. Is that still the plan behind this ticket?</p> <p> </p> <p>The short-term solution is to fit the continuum at &lt;1.2um  and extrapolate it out to 1.26um, and that is the plan of this ticket.  I am still thinking about asking the modeller to extend the model.  He asked me for a line list.  I iterated a bit with the GA team and I realized that there are few strong lines between 1.20 and 1.26um.  So, we may just ask him to extend without a line list.  We can mask any obvious lines between 1.20 and 1.26 in observed spectra, so that they do not affect flux calibration vectors.</p> <p>This figure is an example of the extrapolation. </p> <p><img src="https://pfspipe.ipmu.jp/jira/images/icons/attach/noimage.png" imagetext="p7000_g 4.0_m0.0_t01_z 0.50_a 0.00.AMBRE_Extp.png|thumbnail" align="absmiddle" border="0" /></p> <p>(p7000_g+4.0_m0.0_t01_z+0.50_a+0.00.AMBRE_Extp.png)<br/> <span class="nobr"><a href="https://pfspipe.ipmu.jp/jira/secure/attachment/11909/11909_p7000_g%2B4.0_m0.0_t01_z%2B0.50_a%2B0.00.AMBRE_Extp.png" title="p7000_g+4.0_m0.0_t01_z+0.50_a+0.00.AMBRE_Extp.png attached to PIPE2D-364">p7000_g+4.0_m0.0_t01_z+0.50_a+0.00.AMBRE_Extp.png<sup><img class="rendericon" src="https://pfspipe.ipmu.jp/jira/images/icons/link_attachment_7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span><br/> The extrapolated spectrum from 12000 A to 13000 A was generated from the best fit exponential function. The fitting was done in 9800-11800 A. Before fitting, the spectrum was smoothed by a Gaussian kernel with 2.4 A FWHM (the PFS resolution in NIR), and the Paschen absorptions were masked. </p> <p>The generated spectrum (the smoothed spectrum + extrapolation) is saved in a csv file. </p> <p> </p> <p><a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=takuji.yamashita" class="user-hover" rel="takuji.yamashita">Takuji Yamashita</a> <a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=msyktnk" class="user-hover" rel="msyktnk">Masayuki Tanaka</a> are you waiting now for feedback from others? If so, set the status of this ticket to 'In Review' and assign a reviewer (eg rhl).</p> <p>Following the DRP telecon 2019-04-05, it was agreed to close this ticket based on the work done.</p> <p>This ticket has been closed but I make a note of some revisions to reduce a file size.<br/> The AMBRE stellar models were processed with extrapolateAMBRE.py in a branch “tickets/ /<a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-364" title="Extrapolate the AMBRE library to 1260 nm" class="issue-link" data-issue-key="PIPE2D-364"><del>PIPE2D-364</del></a>” of the git repository “drp_fstar”. A processed spectrum contains flux density from ~300 nm to 1300 nm at a step of 0.01 nm. FITS headers contain CRPIX1, CRVAL, CDELT for the wavelength solution, parameters of continuum fitting, and parameters of the original model. A size of a file is 0.4MB. In total, the size is ~2GB for models of Teff = 6000-8000 K.<br/>  <br/> The procedure of the code is as follows. The asterisk denotes the revisions.<br/> 1*. binning a spectrum from 0.001 nm/pix to 0.01 nm/pix.<br/> 2. smoothing the spectrum with Gaussian kernel with a FWHM of 0.24 nm (= the resolution in NIR of PFS).<br/> 3. mask Paschen absorptions. FWHM to be mask is set to be 30 nm.<br/> 4. fitting the spectrum (wavelength vs. F_lambda) at 980-1180 nm using an exponential function .<br/> 5. extrapolation between ~ 1200 nm and 1300 nm using the fitting result.<br/> 6*. save the processed spectrum (binned spectrum + extrapolation) in .fits with headers. The units is nm and nJy.<br/>  <br/> The step 2 will be revised after the line spread function is provided.</p> Blocks PIPE2D-365 SIM2D-113 Relates PIPE2D-304 Development Rank 0|02qpt6:508yjj0jw Sprint 2DDRP-2019 C Story Points 6.0