astrmodels_YAML_time_varying.yml

electrons (particle source):

  spectrum:

    main:

      log_parabola:

        K: {value: 1.0000000000000002e+38, desc: Normalization, min_value: null, max_value: null,

          unit: 1 / keV, delta: 0.3, free: true}

        piv: {value: 1.0, desc: Pivot (keep this fixed), min_value: null, max_value: null,

          unit: keV, delta: 0.3, free: false}

        alpha: {value: -0.75, desc: index, min_value: null, max_value: null, unit: '',

          delta: 0.6, free: true}

        beta:

          value: f(time)

          desc: curvature (negative is concave, positive is convex)

          min_value: null

          max_value: null

          unit: ''

          law:

            line:

              a: {value: -0.0032, desc: linear coefficient, min_value: null, max_value: null,

                unit: 1 / s, delta: 0.3, free: true}

              b: {value: 0.0, desc: intercept, min_value: null, max_value: null, unit: '',

                delta: 0.1, free: true}

          delta: 0.3

          free: false

      polarization: {}

synch_source (point source):

  position:

    ra: {value: 12.6, desc: Right Ascension, min_value: 0.0, max_value: 360.0, unit: deg,

      delta: 3.78, free: false}

    dec: {value: -13.5, desc: Declination, min_value: -90.0, max_value: 90.0, unit: deg,

      delta: 4.05, free: false}

    equinox: J2000

  spectrum:

    main:

      synchrotron:

        B:

          value: f(time)

          desc: magnetic field

          min_value: null

          max_value: null

          unit: G

          law:

            powerlaw:

              K: {value: 0.000125, desc: Normalization (differential flux at the pivot

                  value), min_value: null, max_value: null, unit: G, delta: 0.3, free: true}

              piv: {value: 1.0, desc: Pivot value, min_value: null, max_value: null,

                unit: s, delta: 0.3, free: false}

              index: {value: -1.0, desc: Photon index, min_value: -10.0, max_value: 10.0,

                unit: '', delta: 0.6, free: true}

          delta: 9.72e-07

          free: false

        distance: {value: 1.0, desc: distance of the source, min_value: null, max_value: null,

          unit: kpc, delta: 0.3, free: true}

        emin: {value: 1.0, desc: minimum energy for the particle distribution, min_value: null,

          max_value: null, unit: GeV, delta: 0.3, free: false}

        emax: {value: 510000.0, desc: maximum energy for the particle distribution,

          min_value: null, max_value: null, unit: GeV, delta: 153000.0, free: false}

        need: {value: 10.0, desc: number of points per decade in which to evaluate

            the function, min_value: 2.0, max_value: 100.0, unit: '', delta: 3.0,

          free: false}

        extra_setup: {particle_distribution: electrons.spectrum.main.log_parabola}

      polarization: {}

time (IndependentVariable): {value: 100.0, desc: None, min_value: null, max_value: null,

  unit: s}

An example of a YAML file from astromodels with two parameters depending on time through respectively a powerlaw and a line.