QSFit.jl
QSO spectral fitting made easy !!
This software is under active development and details may change at any time without notice. Also, documentation is not yet exhaustive.
QSFit started as an attempt to perform automatic analysis of optical spectra of AGNs and QSOs in a simple, replicable and shareable way. The first implementation in IDL language (see repo here has been used to analyze 71261 AGN and QSO spectra from SDSS DR10. The resulting spectral properties (such as emission line luminosities and widths, continuum slopes, etc.) are collected in a catalog in FITS format, as well as being publicly available here: https://qsfit.inaf.it/.
The details of the spectral analysis are presented in a paper: Calderone et al. 2017 (also available on arXiv).
The code has now been ported to Julia and the new package is dubbed QSFit.jl. It comes with the following advantages with respect to the IDL version:
- Julia is released with a MIT license and doesn't require a paid license to be executed;
- It provides better performances and allows to distribute workload on multiple CPUs or multiple host;
- It provides several reusable Components and a few Recipes to perform automatic spectral analysis as well as interactive emissione line fitting;
- It exploits the concept of customizable recipes (see Recipes) to customize the analysis for specific purposes;
QSFit.jl relies on the GModelFit.jl package to perform spectral fitting. A basic knowledge of such package is required to get the most out of QSFit.jl.
Installation
In the Julia REPL type:
using Pkg
Pkg.add("GModelFit")
Pkg.add("GModelFitViewer")
Pkg.add("QSFit")To test the package type Pkg.test("QSFit").
Basic usage
The most important types used in QSFit.jl are:
Spectrum: it represent an observed spectrum of a AGN or QSO. It contains both the observed wavelengths and flux densities (with associated undertainties), as well as a map of "good" (i.e. reliable) spectral bins and an indication of spectral resolution. TheSpectrumobject can operate on spectra taken from any instrument (not only SDSS);CRecipe: it is a container for a specific recipe to be used to analyze aSpectrum, and for all recipe-specific options. QSFit.jl provides a few Built-in recipes to analyze the spectrum, which can optionally be customized by the user. New recipes can also be implemented, either extending the built-in ones or starting from scratch.
The typical workflow for a spectral analysis is as follows:
using QSFit, QSFit.QSORecipes
# Download a spectrum
filename = download("http://dr10.sdss3.org/sas/dr10/sdss/spectro/redux/26/spectra/0752/spec-0752-52251-0323.fits")
# Read spectrum into a Spectrum Object
spec = Spectrum(Val(:SDSS_DR10), filename, label="My SDSS source")
# Create a CRecipe object based on the Type1 recipe to analyze the spectrum
recipe = CRecipe{Type1}(redshift=0.3806, Av=0.21)
# Analyze the spectrum with the above recipe
res = analyze(recipe, spec)
# Display best fit parameter values:
show(res.bestfit)Timestamp: 2025-06-14T10:07:56.156
Spectrum: My SDSS source
resol.: 2000.000
good: 88.671%, units: X=1.0 Å, Y=1.0e-17 erg Å^-1 cm^-2 s^-1
Av: 0.210 (DustExtinction.OD94(3.1))
De-reddening factors @ 1450, 3000, 5100 AA: [1.6990216358789452, 1.4214289702517076, 1.2389351505225081]
z: 0.381 (Cosmology.FlatLCDM{Float64}(0.7, 0.6999146929857499, 0.3, 8.53070142500527e-5))
Good samples before line coverage filter: 3389 / 3822
Line Lyb_na coverage: 0.000 on range 1024.8 < λ < 1026.6, threshold is < 0.600, neglecting...
Line Lyb_br coverage: 0.000 on range 1017.2 < λ < 1034.3, threshold is < 0.600, neglecting...
Line Lya_na coverage: 0.000 on range 1214.6 < λ < 1216.7, threshold is < 0.600, neglecting...
Line Lya_br coverage: 0.000 on range 1205.5 < λ < 1225.8, threshold is < 0.600, neglecting...
Line NV_1241_na coverage: 0.000 on range 1239.7 < λ < 1241.9, threshold is < 0.600, neglecting...
Line OI_1306_br coverage: 0.000 on range 1293.5 < λ < 1315.2, threshold is < 0.600, neglecting...
Line CII_1335_br coverage: 0.000 on range 1324.2 < λ < 1346.4, threshold is < 0.600, neglecting...
Line SiIV_1400_br coverage: 0.000 on range 1386.6 < λ < 1409.9, threshold is < 0.600, neglecting...
Line CIV_1549_na coverage: 0.000 on range 1548.1 < λ < 1550.8, threshold is < 0.600, neglecting...
Line CIV_1549_br coverage: 0.000 on range 1536.6 < λ < 1562.4, threshold is < 0.600, neglecting...
Line HeII_1640_br coverage: 0.000 on range 1626.7 < λ < 1654.1, threshold is < 0.600, neglecting...
Line OIII_1664_br coverage: 0.000 on range 1649.6 < λ < 1677.3, threshold is < 0.600, neglecting...
Line AlIII_1858_br coverage: 0.000 on range 1843.3 < λ < 1874.2, threshold is < 0.600, neglecting...
Line CIII_1909_br coverage: 0.000 on range 1892.6 < λ < 1924.4, threshold is < 0.600, neglecting...
Line CII_2326_br coverage: 0.000 on range 2307 < λ < 2345.8, threshold is < 0.600, neglecting...
Line l2420p0_br coverage: 0.000 on range 2399.8 < λ < 2440.2, threshold is < 0.600, neglecting...
Line MgII_2798_na coverage: 0.000 on range 2797.5 < λ < 2802.4, threshold is < 0.600, neglecting...
Line MgII_2798_br coverage: 0.000 on range 2785.9 < λ < 2814, threshold is < 0.600, neglecting...
Line NeV_3345 coverage: 1.000 on range 3343.5 < λ < 3349.3
Line NeV_3426 coverage: 1.000 on range 3423.5 < λ < 3429.5
Line OII_3727 coverage: 1.000 on range 3725.2 < λ < 3731.7
Line NeIII_3869 coverage: 1.000 on range 3866.8 < λ < 3873.5
Line Hd_br coverage: 1.000 on range 4068.7 < λ < 4137.1
Line Hg_br coverage: 1.000 on range 4305.5 < λ < 4377.9
Line OIII_4363 coverage: 1.000 on range 4360.6 < λ < 4368.2
Line HeII_4686_br coverage: 1.000 on range 4647.9 < λ < 4726.1
Line Hb_na coverage: 1.000 on range 4858.5 < λ < 4866.9
Line Hb_br coverage: 1.000 on range 4822.1 < λ < 4903.2
Line OIII_4959 coverage: 1.000 on range 4956 < λ < 4964.6
Line OIII_5007 coverage: 1.000 on range 5003.9 < λ < 5012.6
Line OIII_5007_bw coverage: 1.000 on range 4983.2 < λ < 5033.3
Line HeI_5876_br coverage: 0.971 on range 5828.3 < λ < 5926.3
Line OI_6300 coverage: 1.000 on range 6296.6 < λ < 6307.5
Line OI_6364 coverage: 0.600 on range 6360 < λ < 6371.1
Line NII_6549 coverage: 0.000 on range 6544.2 < λ < 6555.5, threshold is < 0.600, neglecting...
Line Ha_na coverage: 0.000 on range 6558.9 < λ < 6570.3, threshold is < 0.600, neglecting...
Line Ha_br coverage: 0.118 on range 6509.9 < λ < 6619.3, threshold is < 0.600, neglecting...
Line Ha_bb coverage: 0.284 on range 6345.8 < λ < 6783.4, threshold is < 0.600, neglecting...
Line NII_6583 coverage: 0.000 on range 6579.6 < λ < 6591, threshold is < 0.600, neglecting...
Line SII_6716 coverage: 0.000 on range 6712.4 < λ < 6724.1, threshold is < 0.600, neglecting...
Line SII_6731 coverage: 0.000 on range 6726.8 < λ < 6738.5, threshold is < 0.600, neglecting...
Updated coverage:
Line NeV_3345 coverage: 1.000 on range 3343.5 < λ < 3349.3
Line NeV_3426 coverage: 1.000 on range 3423.5 < λ < 3429.5
Line OII_3727 coverage: 1.000 on range 3725.2 < λ < 3731.7
Line NeIII_3869 coverage: 1.000 on range 3866.8 < λ < 3873.5
Line Hd_br coverage: 1.000 on range 4068.7 < λ < 4137.1
Line Hg_br coverage: 1.000 on range 4305.5 < λ < 4377.9
Line OIII_4363 coverage: 1.000 on range 4360.6 < λ < 4368.2
Line HeII_4686_br coverage: 1.000 on range 4647.9 < λ < 4726.1
Line Hb_na coverage: 1.000 on range 4858.5 < λ < 4866.9
Line Hb_br coverage: 1.000 on range 4822.1 < λ < 4903.2
Line OIII_4959 coverage: 1.000 on range 4956 < λ < 4964.6
Line OIII_5007 coverage: 1.000 on range 5003.9 < λ < 5012.6
Line OIII_5007_bw coverage: 1.000 on range 4983.2 < λ < 5033.3
Line HeI_5876_br coverage: 0.971 on range 5828.3 < λ < 5926.3
Line OI_6300 coverage: 1.000 on range 6296.6 < λ < 6307.5
Line OI_6364 coverage: 0.000 on range 6360 < λ < 6371.1, threshold is < 0.600, neglecting...
Good samples after line coverage filter: 3309 / 3822
Fit continuum components...
Fit summary: #data: 3309, #free pars: 5, red. fit stat.: 1.957, status: OK
Cont. norm. (before): 0.05000436561135932
Cont. norm. (after) : 0.03889446363571945
Fit iron templates...
Ignoring ironuv component (threshold: 0.3)
Fit summary: #data: 3309, #free pars: 2, red. fit stat.: 3.6618, status: OK
Fit known emission lines...
Fit summary: #data: 3309, #free pars: 42, red. fit stat.: 2.307, status: OK
Fit nuisance emission lines...
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 2.2622, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 2.0814, status: WARN
CMPFit status = 2 may imply one (or more) guess values are too far from optimum
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.9265, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.6367, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.6367, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.6174, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.5864, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.5317, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.5301, status: OK
Fit summary: #data: 3309, #free pars: 3, red. fit stat.: 1.5085, status: OK
Last run with all parameters free...
Fit summary: #data: 3309, #free pars: 76, red. fit stat.: 1.2098, status: OK
Disabling nuisance6 (unc. / norm. > 3)
Disabling nuisance7 (norm. = 0)
Re-run fit...
Fit summary: #data: 3309, #free pars: 70, red. fit stat.: 1.1997, status: OK
Total elapsed time: 0.897 s
Components:
╭────────────────────┬─────────────────────┬───────┬─────────────┬───────────┬───────────┬───────────┬─────────╮
│ Component │ Type │ #Free │ Eval. count │ Min │ Max │ Mean │ NaN/Inf │
├────────────────────┼─────────────────────┼───────┼─────────────┼───────────┼───────────┼───────────┼─────────┤
│ main │ SumReducer │ │ 4825 │ 0.03976 │ 0.1162 │ 0.06867 │ 0 │
│ ├─╴Continuum │ SumReducer │ │ 324 │ 0.03796 │ 0.1108 │ 0.0643 │ 0 │
│ │ ├─╴QSOcont │ QSFit.powerlaw │ 2 │ 203 │ 0.01535 │ 0.1058 │ 0.04834 │ 0 │
│ │ ├─╴Galaxy │ QSFit.hostgalaxy │ 1 │ 135 │ 0.001944 │ 0.02519 │ 0.01529 │ 0 │
│ │ └─╴Balmer │ QSFit.balmercont │ 2 │ 281 │ 0 │ 0.002006 │ 0.0006693 │ 0 │
│ ├─╴Iron │ SumReducer │ │ 171 │ 0 │ 0.00823 │ 0.001372 │ 0 │
│ │ ├─╴Ironoptbr │ QSFit.ironopt │ 1 │ 134 │ 0 │ 0.007232 │ 0.001172 │ 0 │
│ │ └─╴Ironoptna │ QSFit.ironopt │ 1 │ 129 │ 0 │ 0.002149 │ 0.0001998 │ 0 │
│ ├─╴NarrowLines │ SumReducer │ │ 2607 │ 0 │ 0.04507 │ 0.0006824 │ 0 │
│ │ ├─╴NeV_3345 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.01092 │ 7.893e-06 │ 0 │
│ │ ├─╴NeV_3426 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.01596 │ 0.0001489 │ 0 │
│ │ ├─╴OII_3727 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.03512 │ 8.496e-05 │ 0 │
│ │ ├─╴NeIII_3869 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.01062 │ 9.911e-05 │ 0 │
│ │ ├─╴OIII_4363 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.008795 │ 5.827e-06 │ 0 │
│ │ ├─╴Hb_na │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.02003 │ 4.912e-05 │ 0 │
│ │ ├─╴OIII_4959 │ QSFit.SpecLineGauss │ 2 │ 461 │ 0 │ 0.01697 │ 2.665e-05 │ 0 │
│ │ ├─╴OIII_5007 │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.04179 │ 0.0001058 │ 0 │
│ │ ├─╴OIII_5007_bw │ QSFit.SpecLineGauss │ 3 │ 536 │ 0 │ 0.004328 │ 0.0001057 │ 0 │
│ │ └─╴OI_6300 │ QSFit.SpecLineGauss │ 3 │ 348 │ 0 │ 0.005748 │ 4.845e-05 │ 0 │
│ ├─╴BroadLines │ SumReducer │ │ 1365 │ 0 │ 0.02039 │ 0.001041 │ 0 │
│ │ ├─╴Hd_br │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.002347 │ 0.0001628 │ 0 │
│ │ ├─╴Hg_br │ QSFit.SpecLineGauss │ 1 │ 461 │ 0 │ 0.00929 │ 0.00021 │ 0 │
│ │ ├─╴HeII_4686_br │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.001837 │ 1.999e-05 │ 0 │
│ │ ├─╴Hb_br │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.02039 │ 0.0004618 │ 0 │
│ │ └─╴HeI_5876_br │ QSFit.SpecLineGauss │ 3 │ 386 │ 0 │ 0.003381 │ 0.000186 │ 0 │
│ └─╴NuisanceLines │ SumReducer │ │ 1289 │ 0 │ 0.01425 │ 0.001277 │ 0 │
│ ├─╴nuisance1 │ QSFit.SpecLineGauss │ 3 │ 219 │ 0 │ 0.01192 │ 4.677e-05 │ 0 │
│ ├─╴nuisance2 │ QSFit.SpecLineGauss │ 3 │ 219 │ 0 │ 0.00738 │ 0.0003437 │ 0 │
│ ├─╴nuisance3 │ QSFit.SpecLineGauss │ 3 │ 231 │ 0 │ 0.01425 │ 0.0001777 │ 0 │
│ ├─╴nuisance4 │ QSFit.SpecLineGauss │ 3 │ 211 │ 0 │ 0.01012 │ 0.0004713 │ 0 │
│ ├─╴nuisance5 │ QSFit.SpecLineGauss │ │ 10 │ 0 │ 0 │ 0 │ 0 │
│ ├─╴nuisance6 │ QSFit.SpecLineGauss │ │ 152 │ 0 │ 0 │ 0 │ 0 │
│ ├─╴nuisance7 │ QSFit.SpecLineGauss │ │ 149 │ 0 │ 0 │ 0 │ 0 │
│ ├─╴nuisance8 │ QSFit.SpecLineGauss │ 3 │ 215 │ 0 │ 0.004369 │ 0.0002035 │ 0 │
│ ├─╴nuisance9 │ QSFit.SpecLineGauss │ 3 │ 273 │ 0 │ 0.009065 │ 8.172e-06 │ 0 │
│ └─╴nuisance10 │ QSFit.SpecLineGauss │ 3 │ 194 │ 0 │ 0.003824 │ 2.559e-05 │ 0 │
╰────────────────────┴─────────────────────┴───────┴─────────────┴───────────┴───────────┴───────────┴─────────╯
Parameters:
╭───────────────────┬─────────────────────┬────────┬─────────────────┬───────────┬───────────┬───────────┬──────────────────────────────────╮
│ Component │ Type │ Param. │ Range │ Value │ Uncert. │ Actual │ Patch │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ QSOcont │ QSFit.powerlaw │ norm │ 6.4e-05:Inf │ 0.04237 │ 0.001341 │ │ │
│ │ │ x0 │ 0:Inf │ 4152 │ (fixed) │ │ │
│ │ │ alpha │ -3:1 │ -2.396 │ 0.08915 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Galaxy │ QSFit.hostgalaxy │ norm │ 0:Inf │ 0.02346 │ 0.001234 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Balmer │ QSFit.balmercont │ norm │ 0:0.5 │ 0.03295 │ 0.03612 │ 0.001396 │ (m, v)->v * (m[:QSOcont]).norm │
│ │ │ ratio │ 0.1:1 │ 0.6263 │ 0.5714 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Ironoptbr │ QSFit.ironopt │ norm │ 0:Inf │ 4.501 │ 0.3906 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Ironoptna │ QSFit.ironopt │ norm │ 0:Inf │ 0.7051 │ 0.2421 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ NeV_3345 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.02008 │ 0.01675 │ │ │
│ │ │ center │ 0:Inf │ 3346 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 146.5 │ 140.2 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ 742.2 │ 59.36 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ NeV_3426 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.3883 │ 0.0497 │ │ │
│ │ │ center │ 0:Inf │ 3426 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 2000 │ │ │ │
│ │ │ voff │ -1e+03:1e+03 │ 451.6 │ 140.4 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OII_3727 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.2414 │ 0.028 │ │ │
│ │ │ center │ 0:Inf │ 3728 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 519.5 │ 67.07 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ -63.14 │ 28.58 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ NeIII_3869 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.2918 │ 0.04368 │ │ │
│ │ │ center │ 0:Inf │ 3870 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 2000 │ │ │ │
│ │ │ voff │ -1e+03:1e+03 │ 485.9 │ 169.5 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Hd_br │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.5124 │ 0.1792 │ │ │
│ │ │ center │ 0:Inf │ 4103 │ (fixed) │ │ │
│ │ │ fwhm │ 9e+02:1.5e+04 │ 1.5e+04 │ │ │ │
│ │ │ voff │ -3e+03:3e+03 │ 3000 │ │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Hg_br │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.6961 │ 0.08514 │ │ │
│ │ │ center │ 0:Inf │ 4342 │ (fixed) │ │ │
│ │ │ fwhm │ 9e+02:1.5e+04 │ 5000 │ (fixed) │ 4865 │ Hb_br │
│ │ │ voff │ -3e+03:3e+03 │ 0 │ (fixed) │ -68.16 │ Hb_br │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OIII_4363 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.01938 │ 0.0131 │ │ │
│ │ │ center │ 0:Inf │ 4364 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 142.1 │ 104.2 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ -75.38 │ 46.46 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ HeII_4686_br │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.07174 │ 0.04494 │ │ │
│ │ │ center │ 0:Inf │ 4687 │ (fixed) │ │ │
│ │ │ fwhm │ 9e+02:1.5e+04 │ 2348 │ 1594 │ │ │
│ │ │ voff │ -3e+03:3e+03 │ -1536 │ 639.5 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Hb_na │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.1821 │ 0.02508 │ │ │
│ │ │ center │ 0:Inf │ 4863 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:1e+03 │ 521.6 │ 68.58 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ -139.4 │ 26.59 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ Hb_br │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 1.712 │ 0.08856 │ │ │
│ │ │ center │ 0:Inf │ 4863 │ (fixed) │ │ │
│ │ │ fwhm │ 9e+02:1.5e+04 │ 4865 │ 266.4 │ │ │
│ │ │ voff │ -3e+03:3e+03 │ -68.16 │ 98.42 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OIII_4959 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.1007 │ 0.01782 │ │ │
│ │ │ center │ 0:Inf │ 4960 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 335.4 │ 60.76 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ 0 │ (fixed) │ -2.118 │ OIII_5007 │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OIII_5007 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.4037 │ 0.02618 │ │ │
│ │ │ center │ 0:Inf │ 5008 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 538.9 │ 36.64 │ │ │
│ │ │ voff │ -1e+03:1e+03 │ -2.118 │ 12.07 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OIII_5007_bw │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.4193 │ 0.09328 │ │ │
│ │ │ center │ 0:Inf │ 5008 │ (fixed) │ │ │
│ │ │ fwhm │ 0:5e+03 │ 4914 │ 1269 │ 5453 │ (m, v)->v + (m[:OIII_5007]).fwhm │
│ │ │ voff │ 0:2e+03 │ 1691 │ 601.1 │ 1689 │ (m, v)->v + (m[:OIII_5007]).voff │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ HeI_5876_br │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 1.033 │ 0.2551 │ │ │
│ │ │ center │ 0:Inf │ 5877 │ (fixed) │ │ │
│ │ │ fwhm │ 9e+02:1.5e+04 │ 1.465e+04 │ 3262 │ │ │
│ │ │ voff │ -3e+03:3e+03 │ 2949 │ 1112 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ OI_6300 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.2571 │ 0.06123 │ │ │
│ │ │ center │ 0:Inf │ 6302 │ (fixed) │ │ │
│ │ │ fwhm │ 1e+02:2e+03 │ 2000 │ │ │ │
│ │ │ voff │ -1e+03:1e+03 │ -315.4 │ 299.2 │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance1 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.3453 │ 0.06326 │ │ │
│ │ │ center │ 6.1e+03:6.1e+03 │ 6081 │ 2.311 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1341 │ 272.8 │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance2 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.9182 │ 0.1807 │ │ │
│ │ │ center │ 3.5e+03:3.5e+03 │ 3507 │ │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1e+04 │ │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance3 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.4008 │ 0.1056 │ │ │
│ │ │ center │ 3e+03:3e+03 │ 2960 │ 3.03 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 2677 │ 746.3 │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance4 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 1.144 │ 0.1631 │ │ │
│ │ │ center │ 3.2e+03:3.2e+03 │ 3186 │ 8.479 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1e+04 │ │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance5 (fixed) │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0 │ (fixed) │ │ │
│ │ │ center │ 5.8e+03:5.8e+03 │ 5789 │ (fixed) │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 4364 │ (fixed) │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance6 (fixed) │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0 │ (fixed) │ │ │
│ │ │ center │ 3.8e+03:3.8e+03 │ 3826 │ (fixed) │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1e+04 │ (fixed) │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance7 (fixed) │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0 │ (fixed) │ │ │
│ │ │ center │ 3e+03:3.1e+03 │ 3058 │ (fixed) │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1e+04 │ (fixed) │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance8 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.5122 │ 0.1623 │ │ │
│ │ │ center │ 3.3e+03:3.3e+03 │ 3304 │ 18.72 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1e+04 │ │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance9 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.153 │ 0.08782 │ │ │
│ │ │ center │ 6e+03:6e+03 │ 6004 │ 3.555 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 630.9 │ 325.8 │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
├───────────────────┼─────────────────────┼────────┼─────────────────┼───────────┼───────────┼───────────┼──────────────────────────────────┤
│ nuisance10 │ QSFit.SpecLineGauss │ norm │ 0:Inf │ 0.07208 │ 0.04767 │ │ │
│ │ │ center │ 3.7e+03:3.7e+03 │ 3697 │ 5.127 │ │ │
│ │ │ fwhm │ 6e+02:1e+04 │ 1437 │ 1019 │ │ │
│ │ │ voff │ -Inf:Inf │ 0 │ (fixed) │ │ │
╰───────────────────┴─────────────────────┴────────┴─────────────────┴───────────┴───────────┴───────────┴──────────────────────────────────╯The best fit model can be displayed using either Gnuplot.jl (to open a plot window):
using Gnuplot
@gp res yrange=[0, 0.25]
or GModelFitViewer.jl (to display the plot in a browser):
using GModelFitViewer
viewer(res)Also, the best fit parameter values can be accessed for any component with (e.g.):
println("Hb integrated luminosity: ",
res.bestfit[:Hb_br].norm.val, " +/- ",
res.bestfit[:Hb_br].norm.unc, " 10^42 erg s^-1")
println("Hb full width at half maximum: ",
res.bestfit[:Hb_br].fwhm.val, " +/- ",
res.bestfit[:Hb_br].fwhm.unc, " km/s")
println("Host galaxy lum. density at 5500A: ",
res.bestfit[:Galaxy].norm.val, " +/- ",
res.bestfit[:Galaxy].norm.unc, " 10^42 erg s^-1 A^-1")Hb integrated luminosity: 1.7117009953205213 +/- 0.08855574387472627 10^42 erg s^-1
Hb full width at half maximum: 4864.552468568376 +/- 266.4169262723797 km/s
Host galaxy lum. density at 5500A: 0.023464141815571073 +/- 0.0012342886797891326 10^42 erg s^-1 A^-1