Spectrum Parameters

We use \(I_{\nu}\) to denote to the SED of sources. It is proportional to the energy emitted at frequency \(\nu\), NOT the number of photons emitted at frequency \(\nu\), and is normalized such that

\[\int_{\text{spectrum_EminNorm}}^{\text{spectrum_EminNorm}} I_{\nu} d\nu = 1\]

We use square brackets on this page to denote the units of parameters.

spectrum_type

Options:

• 'bb': blackbody
• 'pl': power-law
• 'mcd'; Multi-color disk (Mitsuda et al. 1984)
• 'simpl': SIMPL Comptonization model (Steiner et al. 2009)
• 'qso': Quasar template spectrum (Sazonov et al. 2004)

spectrum_Emin

Minimum photon energy to consider in radiative transfer calculation.

Default: 200 [eV]

spectrum_Emax

Maximum photon energy to consider in radiative transfer calculation.

Default: 3e4 [eV]

spectrum_EminNorm

Minimum photon energy to consider in normalization.

Default: 200 [eV]

spectrum_EmaxNorm

Maximum photon energy to consider in normalization.

Default: 3e4 [eV]

spectrum_alpha

Power-law index of emission. Only used if spectrum_type is pl or simpl. Defined such that \(I_{\nu} \propto \nu^{\alpha}\).

Default: -1.5

Recall that \(I_{\nu}\) is proportional to the energy, not the number of photons, emitted at frequency \(\nu\).

spectrum_logN

Base-10 logarithm of the neutral absorbing column in units of \(\text{cm}^{-2}\).

Default: \(-\infty\)

spectrum_Rmax

If spectrum_type is ‘mcd’, this parameter sets the maximum size of the accretion disk being considered.

Default: 1000 [gravitational radii, \(R_g = G M_{\bullet} / c^2\), where \(M_{\bullet}\) is the black hole mass]

spectrum_fcol

Color correction factor, acts to harden BH accretion spectrum.

Default: 1.7

spectrum_kwargs

A dictionary containing any (or all) spectrum parameters.