mass.CO {cosmoFns}

Molecular mass

Description

Compute molecular mass (default CO J = 1-0) from L' and empirical conversion factor.

Usage

mass.CO(intInt, z, alpha = 0.8, f.rest = 115.27, omega.m = 0.27,
omega.lambda = 0.73, H.0 = 71)

Arguments

intInt

Integrated intensity in Jy km/s

z

Redshift

alpha

Empirical mass conversion factor, see details

f.rest

Line rest frequency in GHz

omega.m

Omega matter parameter

omega.lambda

Omega lambda parameter

H.0

Hubble constant in km/s/Mpc

Details

alpha is an empirical mass conversion factor. The exact value is a topic of considerable debate. For CO, see Solomon and Vanden Bout (2005), also Tacconi et al. (2008) for reviews.

Value

Gas mass in solar masses.

Author(s)

A. Harris

References

Solomon, Downes & Radford (1992), ApJ 398, L29, equations (3) and (4); Solomon & Vanden Bout (2005) ARA&A 43, 677; Tacconi et al. (2008) ApJ 680, 246.

See Also

Lprime

Examples

snu <- 1.e-3 # 1 mJy peak
wid <- 400   # 400 km/s wide
intInt <- 1.06*snu*wid  # Gaussian line
z <- 2.3
mass.CO(intInt, z)