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Hannah Middleton
PTAInterpretation
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13153930
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13153930
authored
Apr 27, 2026
by
hannah
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13153930
This directory includes results for the astrophysically informed model (gal).
Three analyses were performed using different numbers of frequency bins from
the PTA analysis. The results are included in the directories: ptmcmc_f3,
ptmcmc_f5, and ptmcmc_f9 for the analyses using 3, 5, and 9 frequency bins,
respectively.
The 9 frequency bin results were used for the EPTA paper plots.
Within each directory, there are two chain files as the ananysis was run twice
and the chains combined to produce the paper figures.
The columns in each file are:
| Column no | Parameter | Description - see table 1 in Chen et al. (2019) |
| -------- | ------- | -------- |
| 0 | Phi0 | GSMF norm |
| 1 | PhiI | GSMF norm redshift evolution |
| 2 | M0 | GSMF scaling mass |
| 3 | alpha0 | GSMF mass slope |
| 4 | alphaI | GSMF mass slope redshift evolution |
| 5 | f0 | Pair fraction norm |
| 6 | alphaf | Pair fraction mass slope |
| 7 | betaf | Pair fraction redshift slope |
| 8 | gammaf | Pair fraction mass ratio slope |
| 9 | tau0 | Merger time norm |
| 10 | alphatau | Merger time mass slope |
| 11 | betatau | Merger time redshift slope |
| 12 | gammatau | Merger time redshift slope |
| 13 | Mstar | Mbulge−MBH relation norm |
| 14 | alphastar | Mbulge−MBH relation slope |
| 15 | epsilon | Mbulge−MBH relation scatter |
| 16 | e0 | Binary eccentricity |
| 17 | zeta0 | Stellar density factor |
| 18 | . | |
| 19 | . | |
| 20 | . | |
| 21 | . | |
For further informatoin about this model, see Section 3.2.2 in the EPTA DR2
paper
<https://doi.org/10.1051/0004-6361/202347433>
and Chen et al. (2019)
<https://doi.org/10.1093/mnras/stz1722>
.
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