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Update ingredients_model.rst
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aabdurrouf authored Jan 7, 2021
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Expand Up @@ -61,4 +61,4 @@ For the modeling of emission from the dusty torus heated by the AGN, FSPS uses A

IGM absoption, redshifting, and convolving with filters
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The :mod:`piXedfit_model` has two options for the IGM absorption: `Madau (1995) <https://ui.adsabs.harvard.edu/abs/1995ApJ...441...18M/abstract>`_ and `Inoue et al. (2014) <https://ui.adsabs.harvard.edu/abs/2014MNRAS.442.1805I/abstract>`_. After applying the IGM absorption, the effect of cosmological redshifting and dimming is then applied to the model spectra. After this process, the spectra has been transformed into the observer frame flux density (:math:`f_{\lambda}`). Typically, this calculation requires redshift information of the galaxy. Whenever provided, input redshift (if spectroscopic redshift is available) is used. Otherwise, redshift is set as a free parameter in the fitting. The calculation of the luminosity distance uses the `cosmology <https://docs.astropy.org/en/stable/cosmology/>`_ package in the `Astropy <https://docs.astropy.org/en/stable/index.html>`_. The final step in generating model photometric SEDs is convolving the model spectra with the set of filter transmission functions. The current vesion of \verb|piXedfit| has a library of transmission functions for 163 photometric filters of ground-based and space-based telescopes. The user can also add a filter transmission function using :func:`add_filter` function in :mod:`filtering` module.
The :mod:`piXedfit_model` has two options for the IGM absorption: `Madau (1995) <https://ui.adsabs.harvard.edu/abs/1995ApJ...441...18M/abstract>`_ and `Inoue et al. (2014) <https://ui.adsabs.harvard.edu/abs/2014MNRAS.442.1805I/abstract>`_. After applying the IGM absorption, the effect of cosmological redshifting and dimming is then applied to the model spectra. After this process, the spectra is transformed into the observer frame flux density (:math:`f_{\lambda}`). Typically, this calculation requires redshift information of the galaxy. Whenever provided, input redshift (if spectroscopic redshift is available) is used. Otherwise, redshift is set as a free parameter in the fitting. The calculation of the luminosity distance uses the `cosmology <https://docs.astropy.org/en/stable/cosmology/>`_ package in the `Astropy <https://docs.astropy.org/en/stable/index.html>`_. The final step in generating model photometric SEDs is convolving the model spectra with the set of filter transmission functions. The current vesion of **piXedfit** has 163 photometric filters of ground-based and space-based telescopes. The user can also add a filter transmission function using :func:`add_filter` function in :mod:`filtering` module.

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