O VIII Ly beta 16.0063 MEG only PLT> wdata /home/cohen/xspec/2007/zpup/oviii_16006_dataonly.dat Looking at this plot, and at atomdb, which predicts Fe XVIII lines of appreciable strength (if the plasma is hot enough) at: 15.625 (strongest) - 0.58 15.824 (half as strong) - 0.36 15.870 (quarter as strong) - 0.19 15.931 (quarter as strong) - 0.14 16.004 (even stronger) - 0.68 16.071 (a bit stronger still) - 0.84 16.110 (three quarters as strong) - 0.46 16.159 (half as strong) - 0.32 Define a low-ish continuum on 15.65:15.75, 16.2:16.4 ======================================================================== Model powerlaw<1> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 powerlaw PhoIndex 2.00000 frozen 2 1 powerlaw norm 2.55129E-03 +/- 4.46233E-04 ________________________________________________________________________ C-statistic = 114.56 using 116 PHA bins and 115 degrees of freedom. Warning: Cstat statistic is only valid for Poisson data. XSPEC12>goodness 1000 nosim 20.10% of realizations are < best fit statistic 114.56 XSPEC12>error 1. 2 Parameter Confidence Range (1.0000000) 2 0.002282 0.002841 (-0.000270,0.000290) XSPEC12>error 2.7 2 Parameter Confidence Range (2.700000) 2 0.002118 0.003040 (-0.000433,0.000488) fit line on 15.88:16.125 ======================================================================== Model windprof<1> + powerlaw<2> Source No.: 1 Active/On Model Model Component Parameter Unit Value par comp 1 1 windprof q 0.0 frozen 2 1 windprof taustar 9.51455E-02 +/- 0.264021 3 1 windprof u0 0.384454 +/- 6.81326E-02 4 1 windprof h 0.0 frozen 5 1 windprof tau0star 0.0 frozen 6 1 windprof beta 1.00000 frozen 7 1 windprof betaSob 0.0 frozen 8 1 windprof numerica 0 frozen 9 1 windprof anisotro 0 frozen 10 1 windprof rosselan 0 frozen 11 1 windprof expansio 0 frozen 12 1 windprof thick 0 frozen 13 1 windprof waveleng "A" 16.0060 frozen 14 1 windprof shift "mA" 0.0 frozen 15 1 windprof velocity "km/s" 2250.00 frozen 16 1 windprof verbose 0 frozen 17 1 windprof norm 1.15516E-04 +/- 2.17095E-05 18 2 powerlaw PhoIndex 2.00000 frozen 19 2 powerlaw norm 2.55000E-03 frozen ________________________________________________________________________ C-statistic = 124.55 using 96 PHA bins and 93 degrees of freedom. Warning: Cstat statistic is only valid for Poisson data. XSPEC12>plot XSPEC12>error 1. 2 Parameter Confidence Range (1.000000) ***Warning: Parameter pegged at hard limit: 0 2 0.000000 0.576653 (-0.095046,0.481607) XSPEC12>error 2.7 2 Parameter Confidence Range (2.700000) ***Warning: Parameter pegged at hard limit: 0 2 0.000000 1.035842 (-0.095056,0.940786) XSPEC12>goodness 1000 nosim 88.50% of realizations are < best fit statistic 124.55 This seems indicative of some line blending: the line is broader and flatter looking (uo small); maybe taustar values aren't that reliable This situation is reminiscent of the N VII Ly alpha line at 24.781 which is blended with N VI beta XSPEC12>error 1. 3 Parameter Confidence Range (1.0000000) 3 0.303518 0.452415 (-0.080933,0.067964) XSPEC12>error 2.7 3 Parameter Confidence Range (2.700000) 3 0.232435 0.491285 (-0.152014,0.106836) XSPEC12>error 1. 17 Parameter Confidence Range (1.000000) 17 0.000106 0.000129 (-0.000009,0.000013) XSPEC12>error 2.7 17 Parameter Confidence Range (2.700000) 17 0.000100 0.000136 (-0.000016,0.000020) XSPEC12>iplot PLT> wdata /home/cohen/xspec/2007/zpup/oviii_16006_smooth.dat XSPEC12>log /home/cohen/xspec/2007/zpup/oviii_16006_smooth_35by35_stdrange.log Logging to file:/home/cohen/xspec/2007/zpup/oviii_16006_smooth_35by35_stdrange.log XSPEC12>steppar 2 0.01 4.5 35 3 0.48 0.99 35 XSPEC12>log /home/cohen/xspec/2007/zpup/oviii_16006_smooth_35by35.log Logging to file:/home/cohen/xspec/2007/zpup/oviii_16006_smooth_35by35.log XSPEC12>steppar 2 0.01 4.5 35 3 0.08 0.59 35 Source File: acis640_pha2.fits{9} Net count rate (cts/s) for Spectrum:1 2.425e-03 +/- 3.096e-04 Assigned to Data Group 1 and Plot Group 1 Noticed Channels: 5169-5216 Telescope: CHANDRA Instrument: ACIS Channel Type: PI Exposure Time: 67636.0078 sec Using Response (RMF) File meg_m1.rmf for Source 1 Using Auxiliary Response (ARF) File acis640MEG_-1_garf.fits Source spectrum counts: 164.000000 Model predicted rate: 2.31045E-03 Source File: acis640_pha2.fits{10} Net count rate (cts/s) for Spectrum:2 1.079e-03 +/- 2.531e-04 Assigned to Data Group 1 and Plot Group 2 Noticed Channels: 5169-5216 Telescope: CHANDRA Instrument: ACIS Channel Type: PI Exposure Time: 67636.0078 sec Using Response (RMF) File meg_p1.rmf for Source 1 Using Auxiliary Response (ARF) File acis640MEG_1_garf.fits Source spectrum counts: 73.000000 Model predicted rate: 1.11972E-03