# HEXTE continuum sensitivity data. P. R. Blanco, 1997 Sep 26. # ============================================================ # Below I have tabulated data for the calculation of the HEXTE # continuum sensitivity as a function of energy. Please refer to # the Feasibility Chapter of the NASA Research Announcement # for details. # Column 1: Incident photon energy in keV # Column 2: Mean photopeak effective area per cluster, in cm^2, multiplied by # a nominal live-time fraction on-source of 0.6. This excludes detector PWB2. # Thus the source count rate = Intensity (photon/cm^2/s) * {Effective Area} # Column 3: Mean Background count rate per cluster, excluding detector PWB2. # Column 4: FWHM resolution of a single HEXTE detector (PWB3), in keV. # The cluster-average FWHM is only slightly larger than this. # Column 5: Limiting continuum intensity (photon/cm^2/s per FWHM resolution # element) for a 3-sigma detection in a 2.0E5 s observation, using both # clusters in their 16-second source/background switching mode, and assuming # a typical on-source live-time fraction of 0.6. This is calculated from the # general formula: # Limiting intensity = SNR * SQRT(2.333 * {Background} / time) # / (livefrac * {Effective Area}) / SQRT({FWHM}) # ...with SNR=3, time=2.0E5, livefrac=0.6, and items in {} taken from the # columns below. # This formula is valid for observation times at least up to 500 ks, # where fluctuations in the cosmic x-ray background begin to contribute # at the lower energies. # ----------------------------------------------------------------------- # Energy Effective Background FWHM Limiting intensity # (keV) Area (cm^2) (count/s) (keV) (photon/cm^2/s/keV) 10.0763 160.256 0.627886 4.95455 3.79346e-05 10.9364 272.916 0.535626 4.95248 2.05779e-05 11.7917 374.544 0.489208 4.96635 1.43099e-05 12.6463 459.271 0.486858 4.99465 1.16089e-05 13.5096 525.724 0.490197 5.03550 1.01349e-05 14.3884 580.927 0.506522 5.09035 9.27290e-06 15.2831 610.525 0.521197 5.15562 8.89343e-06 16.1886 635.653 0.523630 5.22917 8.50135e-06 17.1023 654.961 0.521162 5.30726 8.17049e-06 18.0253 669.205 0.465407 5.39026 7.49834e-06 18.9565 679.182 0.395432 5.47722 6.75588e-06 19.8939 688.876 0.333959 5.56667 6.07183e-06 20.8364 696.461 0.291939 5.65825 5.56956e-06 21.7855 702.429 0.281854 5.75209 5.38157e-06 22.7393 707.721 0.312139 5.84753 5.57491e-06 23.6959 712.604 0.387750 5.94353 6.12093e-06 24.6554 716.726 0.515188 6.04031 6.95845e-06 25.6181 716.979 0.705825 6.13785 8.07693e-06 26.5842 717.839 0.959801 6.23615 9.33293e-06 27.5539 718.884 1.26293 6.33497 1.06065e-05 28.5263 719.307 1.57028 6.43458 1.17281e-05 29.5007 718.990 1.81605 6.53391 1.25218e-05 30.4781 717.963 1.93332 6.63404 1.28403e-05 31.4593 716.957 1.87777 6.73462 1.25772e-05 32.5101 716.587 1.67562 6.84236 1.17931e-05 33.8262 554.750 1.38083 7.03930 1.36339e-05 35.0627 562.723 1.07695 7.17099 1.17605e-05 35.9885 572.242 0.820686 7.25668 1.00358e-05 36.8787 587.313 0.638272 7.33558 8.57686e-06 37.7715 608.748 0.522074 7.41626 7.44300e-06 38.6658 633.646 0.453157 7.49715 6.62585e-06 39.5639 662.936 0.408415 7.57901 5.97979e-06 40.4716 688.632 0.370119 7.66292 5.45003e-06 41.3850 711.473 0.332212 7.74802 4.97011e-06 42.3039 729.506 0.296933 7.83424 4.55737e-06 43.2272 746.008 0.266352 7.92130 4.19758e-06 44.1549 755.769 0.246052 8.00922 3.96043e-06 45.0871 763.789 0.234653 8.09797 3.80595e-06 46.0247 767.971 0.234815 8.18761 3.76576e-06 46.9678 771.117 0.243684 8.27821 3.79959e-06 47.9156 773.345 0.260990 8.36958 3.89941e-06 48.8678 774.522 0.285711 8.46166 4.05149e-06 49.8243 775.317 0.314222 8.55437 4.22141e-06 50.7848 776.205 0.341450 8.64768 4.37169e-06 51.7496 777.057 0.364072 8.74157 4.48496e-06 52.7188 777.365 0.376924 8.83614 4.53715e-06 53.6919 777.787 0.376658 8.93118 4.50890e-06 54.6682 778.584 0.367279 9.02666 4.42427e-06 55.6476 779.146 0.354720 9.12253 4.32194e-06 56.6301 779.285 0.342693 9.21874 4.22506e-06 57.6158 779.462 0.342075 9.31530 4.19836e-06 58.6047 779.646 0.358178 9.41227 4.27285e-06 59.5966 779.995 0.391514 9.50957 4.44236e-06 60.5914 780.345 0.447961 9.60716 4.72550e-06 61.5887 780.325 0.520682 9.70508 5.06901e-06 62.5886 780.082 0.605606 9.80316 5.44107e-06 63.5911 779.756 0.697705 9.90152 5.81351e-06 64.5966 779.390 0.786629 10.0002 6.14523e-06 65.6045 779.309 0.859507 10.0991 6.39273e-06 66.6149 779.350 0.916192 10.1983 6.56765e-06 67.6278 778.952 0.946243 10.2977 6.64559e-06 68.6432 778.371 0.954059 10.3973 6.64590e-06 69.6614 777.490 0.933215 10.4972 6.54896e-06 70.6823 776.474 0.898318 10.5973 6.40328e-06 71.7057 775.112 0.852609 10.6977 6.21982e-06 72.7316 773.566 0.801179 10.7983 6.01315e-06 73.7599 771.574 0.744958 10.8991 5.78637e-06 74.7908 769.284 0.690134 11.0002 5.56023e-06 75.8240 766.704 0.637713 11.1014 5.33838e-06 76.8597 763.863 0.590342 11.2029 5.13197e-06 77.8978 760.643 0.543487 11.3046 4.92265e-06 78.9383 756.931 0.503071 11.4065 4.73800e-06 79.9808 752.842 0.467722 11.5084 4.57293e-06 81.0252 747.958 0.433594 11.6107 4.41213e-06 82.0722 742.935 0.410199 11.7130 4.30154e-06 83.1212 737.341 0.388141 11.8156 4.19769e-06 84.1721 731.743 0.365290 11.9183 4.08569e-06 85.2253 726.331 0.348181 12.0212 4.00135e-06 86.2807 720.907 0.331261 12.1243 3.91553e-06 87.3382 714.711 0.313334 12.2275 3.82486e-06 88.3981 708.371 0.293876 12.3310 3.72164e-06 89.4605 701.534 0.273920 12.4346 3.61293e-06 90.5257 694.431 0.253958 12.5386 3.49977e-06 91.5934 687.579 0.232679 12.6427 3.36937e-06 92.6637 681.039 0.213604 12.7471 3.24593e-06 93.7368 674.337 0.195560 12.8517 3.12388e-06 94.8125 667.108 0.178938 12.9567 3.00829e-06 95.8907 659.863 0.163213 13.0617 2.89292e-06 96.9712 652.351 0.152999 13.1671 2.82183e-06 98.0537 644.819 0.141846 13.2725 2.73783e-06 99.1381 637.513 0.134803 13.3780 2.68891e-06 100.224 630.291 0.128863 13.4838 2.64868e-06 101.312 622.662 0.124064 13.5896 2.62047e-06 102.402 614.496 0.119513 13.6956 2.59604e-06 103.492 606.472 0.116882 13.8015 2.59126e-06 104.584 599.496 0.116113 13.9076 2.60280e-06 105.677 592.514 0.116986 14.0136 2.63333e-06 106.771 585.680 0.115060 14.1197 2.63210e-06 107.865 578.880 0.114203 14.2256 2.64318e-06 108.960 572.078 0.115785 14.3317 2.68309e-06 110.055 565.276 0.116256 14.4375 2.71089e-06 111.150 558.438 0.116438 14.5433 2.73623e-06 112.245 551.125 0.115916 14.6491 2.75631e-06 113.339 543.815 0.115286 14.7546 2.77578e-06 114.433 537.342 0.115698 14.8601 2.80424e-06 115.527 531.295 0.115575 14.9653 2.82466e-06 116.620 524.996 0.115987 15.0705 2.85363e-06 117.713 517.832 0.115564 15.1755 2.87781e-06 118.806 510.672 0.114871 15.2804 2.89940e-06 119.898 504.326 0.115277 15.3851 2.93104e-06 120.989 498.239 0.115769 15.4896 2.96313e-06 122.080 491.238 0.116053 15.5941 2.99895e-06 123.171 484.406 0.116526 15.6984 3.03729e-06 124.261 477.916 0.117386 15.8026 3.07968e-06 125.350 470.773 0.118069 15.9066 3.12522e-06 126.439 463.306 0.118680 16.0105 3.17344e-06 127.527 456.080 0.118878 16.1143 3.21600e-06 128.615 450.051 0.119552 16.2179 3.25785e-06 129.703 444.024 0.120193 16.3214 3.30040e-06 130.790 437.596 0.121204 16.4248 3.35235e-06 131.876 430.870 0.123215 16.5281 3.42204e-06 132.963 424.145 0.124222 16.6313 3.47964e-06 134.049 418.787 0.126171 16.7345 3.54073e-06 135.136 413.504 0.127716 16.8375 3.59679e-06 136.223 407.824 0.129072 16.9406 3.65503e-06 137.309 401.188 0.132079 17.0437 3.74715e-06 138.396 394.551 0.134317 17.1466 3.83077e-06 139.483 389.023 0.137167 17.2496 3.91447e-06 140.571 384.194 0.141134 17.3524 4.00864e-06 141.658 379.365 0.143562 17.4553 4.08236e-06 142.745 374.212 0.148209 17.5581 4.19269e-06 143.833 369.023 0.151549 17.6609 4.28675e-06 144.921 363.861 0.154126 17.7638 4.37165e-06 146.010 358.837 0.158683 17.8667 4.48497e-06 147.099 353.811 0.161192 17.9695 4.57136e-06 148.188 348.975 0.164909 18.0723 4.67449e-06 149.277 344.418 0.167258 18.1750 4.75646e-06 150.367 339.860 0.169238 18.2778 4.83503e-06 151.457 335.529 0.171395 18.3806 4.91475e-06 152.548 331.339 0.173029 18.4833 4.98665e-06 153.638 327.148 0.174667 18.5862 5.06032e-06 154.730 322.719 0.174452 18.6890 5.11249e-06 155.822 318.229 0.176222 18.7918 5.19657e-06 156.914 313.739 0.175231 18.8946 5.24181e-06 158.006 309.959 0.175362 18.9974 5.29332e-06 159.099 306.208 0.175287 19.1002 5.34259e-06 160.192 302.411 0.173603 19.2031 5.36917e-06 161.286 298.199 0.174312 19.3058 5.44159e-06 162.380 293.986 0.173884 19.4087 5.49816e-06 163.474 289.873 0.173158 19.5115 5.54983e-06 164.569 286.157 0.171908 19.6145 5.58686e-06 165.664 282.439 0.172012 19.7173 5.64733e-06 166.760 278.841 0.171472 19.8201 5.69638e-06 167.856 275.542 0.170771 19.9230 5.73792e-06 168.952 272.241 0.171701 20.0259 5.80829e-06 170.048 269.193 0.172184 20.1287 5.86728e-06 171.145 266.627 0.173481 20.2316 5.93087e-06 172.242 264.060 0.175817 20.3344 6.01345e-06 173.340 261.021 0.177749 20.4373 6.10138e-06 174.437 257.200 0.182180 20.5402 6.25302e-06 175.535 253.377 0.185541 20.6431 6.38965e-06 176.634 250.143 0.189412 20.7460 6.52321e-06 177.732 247.863 0.195019 20.8488 6.66342e-06 178.831 245.583 0.200788 20.9518 6.80727e-06 179.931 242.846 0.206965 21.0546 6.97197e-06 181.030 239.305 0.212834 21.1576 7.15730e-06 182.130 235.762 0.221218 21.2605 7.38858e-06 183.230 232.512 0.227649 21.3634 7.58166e-06 184.331 229.896 0.235377 21.4663 7.77827e-06 185.432 227.280 0.241415 21.5693 7.94905e-06 186.533 224.657 0.246013 21.6722 8.09878e-06 187.635 222.016 0.251707 21.7752 8.26977e-06 188.737 219.375 0.256492 21.8781 8.42863e-06 189.839 216.794 0.260962 21.9812 8.58277e-06 190.942 214.565 0.261116 22.0842 8.65426e-06 192.045 212.335 0.262764 22.1872 8.75230e-06 193.148 210.117 0.264028 22.2902 8.84545e-06 194.252 208.325 0.263507 22.3932 8.89217e-06 195.356 206.533 0.259177 22.4962 8.87495e-06 196.460 204.741 0.256103 22.5993 8.87907e-06 197.565 201.631 0.250950 22.7023 8.90456e-06 198.669 198.342 0.245441 22.8053 8.93208e-06 199.774 195.052 0.238943 22.9084 8.94150e-06 200.880 192.978 0.232049 23.0114 8.88631e-06 201.985 191.407 0.224499 23.1145 8.79266e-06 203.091 189.834 0.215752 23.2176 8.67175e-06 204.198 188.307 0.208546 23.3206 8.57582e-06 205.304 186.824 0.200691 23.4239 8.46088e-06 206.411 185.339 0.192329 23.5269 8.33075e-06 207.518 183.632 0.183816 23.6301 8.20208e-06 208.625 181.364 0.177168 23.7330 8.13536e-06 209.732 179.096 0.171514 23.8362 8.08830e-06 210.840 176.830 0.166472 23.9392 8.05326e-06 211.947 174.627 0.162033 24.0423 8.02811e-06 213.056 172.424 0.157450 24.1455 7.99776e-06 214.164 170.220 0.153898 24.2486 7.99234e-06 215.272 168.806 0.151859 24.3517 7.98876e-06 216.381 167.641 0.149516 24.4549 7.96515e-06 217.490 166.475 0.147826 24.5579 7.95873e-06 218.599 164.980 0.146598 24.6611 7.98065e-06 219.709 163.097 0.145950 24.7643 8.03811e-06 220.819 161.214 0.145481 24.8673 8.10208e-06 221.928 159.342 0.143962 24.9706 8.13751e-06 223.039 157.542 0.144377 25.0737 8.22538e-06 224.149 155.742 0.145026 25.1768 8.32204e-06 225.260 153.941 0.144858 25.2800 8.39729e-06 226.371 152.723 0.145717 25.3832 8.47206e-06 227.482 151.670 0.145800 25.4863 8.51604e-06 228.593 150.617 0.145350 25.5895 8.54505e-06 229.704 149.283 0.145956 25.6928 8.62196e-06 230.816 147.528 0.146402 25.7959 8.72042e-06 231.928 145.772 0.146649 25.8991 8.81530e-06 233.040 144.015 0.148407 26.0023 8.95829e-06 234.152 142.316 0.147390 26.1055 9.01628e-06 235.265 140.616 0.149481 26.2087 9.17164e-06 236.377 138.916 0.150236 26.3118 9.28904e-06 237.490 137.337 0.151306 26.4150 9.41081e-06 238.603 135.851 0.150650 26.5183 9.47462e-06 239.717 134.365 0.150724 26.6215 9.56317e-06 240.830 132.800 0.151915 26.7248 9.69522e-06 241.944 130.599 0.152878 26.8279 9.87083e-06 243.058 128.397 0.152834 26.9313 1.00194e-05 244.172 126.195 0.154777 27.0345 1.02392e-05 245.286 123.537 0.154753 27.1377 1.04387e-05 246.401 120.609 0.155625 27.2411 1.07019e-05 247.516 117.680 0.156055 27.3443 1.09626e-05 248.631 114.672 0.155231 27.4475 1.11994e-05 249.746 111.082 0.157542 27.5508 1.16252e-05 250.861 107.492 0.157713 27.6541 1.19975e-05 251.977 103.901 0.157605 27.7574 1.23847e-05 253.092 100.310 0.157981 27.8605 1.28196e-05 254.208 96.4010 0.157792 27.9640 1.33068e-05 255.325 92.3531 0.158721 28.0672 1.39053e-05 256.441 88.3044 0.157690 28.1717 1.44685e-05 257.558 84.2550 0.158266 28.2773 1.51632e-05 258.674 80.2049 0.157505 28.3829 1.58610e-05 259.791 76.1539 0.158094 28.4885 1.67049e-05 260.909 72.2994 0.157970 28.5941 1.75560e-05 262.026 68.6846 0.156817 28.6997 1.83785e-05 263.143 65.0690 0.122463 28.8054 1.71122e-05 264.261 61.4528 0.0785678 28.9110 1.44864e-05 265.379 57.8358 0.0597046 29.0167 1.33935e-05 266.497 54.2183 0.0242961 29.1224 9.09747e-06 267.616 50.6002 0.0112580 29.2282 6.62353e-06 268.735 47.3020 0.00976070 29.3339 6.58549e-06 269.853 45.0544 0.00839475 29.4397 6.40048e-06 270.972 42.8063 0.00713632 29.5455 6.20006e-06 272.092 40.5579 0.0555429 29.6513 1.82234e-05