Coverage for /wheeldirectory/casa-6.7.0-12-py3.10.el8/lib/py/lib/python3.10/site-packages/casatools/constants.py: 0%

1""" 

2Constants file contributed by Adam Leroy 

3""" 

4 

5# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

6# IMPORTS 

7# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

8 

9import numpy as _numpy 

10 

11# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

12# CGS PHYSICAL CONSTANTS 

13# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

14 

15c = 2.99792458e10 # speed of light CGS 

16h = 6.6260755e-27 # Planck's constant CGS 

17g = 6.67259e-8 # Grav const CGS 

18kb = 1.380658e-16 # Boltzmann's const CGS 

19a = 7.56591e-15 # Radiation constant CGS 

20sb = 5.67051e-5 # sigma (stefan-boltzmann const) CGS 

21qe = 4.803206e-10 # Charge of electron CGS 

22ev = 1.60217733e-12 # Electron volt CGS 

23na = 6.0221367e23 # Avagadro's Number 

24me = 9.1093897e-28 # electron mass CGS 

25mp = 1.6726231e-24 # proton mass CGS 

26mn = 1.674929e-24 # neutron mass CGS 

27mh = 1.673534e-24 # hydrogen mass CGS 

28amu = 1.6605402e-24 # atomic mass unit CGS 

29 

30# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

31# ASTRONOMICAL CONSTANTS 

32# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

33 

34# GENERAL 

35au = 1.496e13 # astronomical unit CGS 

36pc = 3.0857e18 # parsec CGS 

37yr = 3.155815e7 # sidereal year CGS 

38ms = 1.98900e+33 # solar mass CGS 

39rs = 6.9599e10 # sun's radius CGS 

40ls = 3.839e33 # sun's luminosity CGS 

41mm = 7.35000e+25 # moon mass CGS 

42mer = 5.97400e+27 # earth mass CGS 

43rer = 6.378e8 # earth's radius CGS 

44medd = 3.60271e+34 # Eddington mass CGS 

45 

46# RADIO SPECIFIC 

47jy = 1.e-23 # Jansky CGS 

48restfreq_hi = 1420405751.786 # 21cm transition (Hz) 

49restfreq_co = 115271201800. # CO J=1-0 (Hz) 

50cm2perkkms_hi = 1.823e18 # HI column per intensity (thin) 

51 

52# OTHER WAVELENGTHS 

53ksun = 3.28 # abs K mag of sun (Binney & Merrifield) 

54 

55# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

56# GEOMETRY 

57# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

58 

59srdeg = 3283.0 # Degrees squared in a steradian 

60dtor = 0.0174532925199 # Degrees per radian 

61pi = 3.14159265359 # Pi 

62 

63# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

64# BASIC PHYSICAL FUNCTIONS 

65# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

66 

67def bb_inu(temp_k=None, lam_cm=None): 

68 """ 

69 Planck function. Returns f_nu given T and lambda. 

70 """ 

71 nu = c / lam_cm 

72 fnu = 2.0*h*nu**3/c**2 /(_numpy.exp(h*nu/(kb*temp_k))-1.0) 

73 return fnu, "erg/s/cm^2/sr/Hz" 

74 

75def bb_ilam(temp_k=None, lam_cm=None): 

76 """ 

77 Planck function. Returns f_lambda given T and lambda. 

78 """ 

79 flam = 2.0*h*c**2/lam_cm**5 / (_numpy.exp(h*c/(lam_cm*kb*temp_k))-1.0) 

80 return (flam, "erg/s/cm^2/sr/cm") 

81 

82def peak_inu(temp_k=None): 

83 """ 

84 Wavelength for peak of F_nu given T. 

85 """ 

86 peak_lam = 2.821439372/kb/temp_k/h 

87 peak_nu = c / peak_lam 

88 return (peak_lam, "cm") 

89 

90def peak_ilam(temp_k=None): 

91 """ 

92 Wavelength for peak of F_lambda given T. 

93 """ 

94 return h*c/kb/temp_k/4.965114231, "cm" 

95 

96# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

97# UNIT CONVERSIONS 

98# %&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%&%& 

99