thesis - IRS, The Infrared Spectrograph

Table 6.8–. Far infrared flux in units of 10 −12 erg cm −2 s −1 , incident FUV flux G 0 (normalized to the average interstellar field) and densityn H (in cm −3 ) of the nebulae. See text for details.Name F IR G 0 n H (cm −3 ) Grid models(Watt/m 2 ) (1.6e-6 Watt/m 2 ) Si II O I (63 µm) O I (146 µm) C II G 0 n H (cm −3 )NGC 7027 2.2 10 −10 9.1 10 4 10 4 F > 10 5 > 10 5 2 10 5 > 10 7NGC 6153 8.2 10 −12 1.4 10 3 - 2 10 2 - - - -BD+30 3639 5.3 10 −11 1.1 10 5 - > 10 5 > 10 4 > 10 4 810 5 > 6 10 5NGC 3918 5.2 10 −12 5.6 10 3 - 6 10 3 > 10 3 F 2 10 5 > 10 7Hb 5 1.8 10 −11 1.2 10 5 F F F F 10 5 > 2 10 5Mz 3 6.9 10 −11 7.3 10 6 F F F - - -K 3-17 7.9 10 −12 1.3 10 4 > 2 10 4 > 10 5 > 5 10 3 > 10 4 10 5 5 10 4NGC 6543 1.6 10 −11 7.4 10 3 - 8 10 5 - > 5 10 1 3 10 5 4 10 3NGC 6302 8.2 10 −11 8.7 10 4 - F F F 6 10 4 3 10 4F: Models cannot reproduce the observations.122 CHAPTER 6: Physical Conditions in PDRs around Planetary Nebulae