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lumdist = function(z = 1, c = 3E8, H = 70, M = 0.3, L = 1-M, K = 1-M-L, units = "Mpc"){
# Luminosty distance DL
# redshift, speed of light (m/s), hubble constant (km/s/Mpc), DM, DE, curvature, output units (m or Mpc)
# FROM: Hogg, 1999
H = (3.24077649E-20)*H
DH = c/H
E1 = function(a){((M*(1+a)^3) + (K*(1+a)^2) + L)^-0.5}
DC = DH*Vectorize(function(z){integrate(E1, lower=0, upper=z)$value})(z)
if(K>0){
DM = DH*(K^-0.5)*sinh(K^0.5*DC/DH)
}else if(K<0){
DM = DH*(abs(K)^-0.5)*sin((abs(K)^0.5)*DC/DH)
}else{
DM = DC
}
DL = (1+z)*DM
if(units=="Mpc"){
mfact=3.24077649E-23
}else if(units=="ly"){
mfact=1/(c*31556926)
}else{
mfact=1
}
return(mfact*DL)
}
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