README File for Simulation of the Galactic Gravitational Wave Background Seth E. Timpano, Louis J. Rubbo, and Neil J. Cornish February 12, 2004 Source Information ============================== Source Populations: Unevolved: 0 W UMa: 3.0e6 Catacylsmics: 1.8e6 NS-NS: 1.0e6 NS-BH: 5.0e5 CWDB: 3.0e6 The sources were drawn from the distributions described in D. Hils, P. Bender, and R.F. Webbink, Astrophys, J. 360, 75 (1990), The number of CWDB has been reduced by a factor of 10 from Hils et al. The source parameters for the 10 brightest sources in each frequency bin are recorded in the file "Parameters_HBW.dat". Each row in the file describes one source, and the ten columns list the amplitude, frequency (mHz), ecliptic colatitude, ecliptic longitude, polarization angle, inclination angle, orbital phase, primary mass (Solar mass), secondary mass (Solar mass), and luminosity distance (kpc). The definitions of all these quantities can be found in L.J. Rubbo, N.J. Cornish, Olivier Poujade gr-qc/0311069 (2003). Detector Information ============================== Total Observation Time = 1.0 years Number of sample points: 2^23 = 8388608 Sample Cadence: 3.762 sec kappa: 0 lambda: 0 The simulations do no include detector noise. The simulations use the Accelerated LISA Simulator, which operates in a mixed time-frequency domain based on the Low Frequency Approximation and the Adiabatic Approximation. At the frequencies of the galactic background, the output is indistinguishable from the publically available LISA Simulator Version 2.0. Sources below 1 mHz are modeled by Curt Cutler's Low Frequency Approximation, as described in N.J. Cornish and L.J. Rubbo, Phys. Rev. D 67, 022001 (2003). Higher frequency, chirping sources were modeled using the Rigid Adiabatic Approximation found in L.J. Rubbo, N.J. Cornish, Olivier Poujade gr-qc/0311069 (2003). The switch from the Low Frequency to the Adiabatic Approximation occured at the following source dependent frequencies: NS-BH = 1mHz NS-NS = 2mHz CWDB = 3mHz Simulated Data Information ============================== The simulated response to the Galactic background can be found in the file "Galactic_Background_HBW.dat". This file lists in three column format, the time-ordered TDI variables X, Y, and Z.