parse_backgrd.cpp

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/* This file is part of Cloudy and is copyright (C)1978-2017 by Gary J. Ferland and
 * others.  For conditions of distribution and use see copyright notice in license.txt */
/*ParseBackgrd parse options for the BACKGROUND command - this actually enters two continua*/
#include "cddefines.h"
#include "cosmology.h"
#include "radius.h"
#include "rfield.h"
#include "parser.h"

void ParseBackgrd(Parser &p)
{
        double a, 
          fac, 
          rlogl, 
          z;

        DEBUG_ENTRY( "ParseBackgrd()" );

        /* check that stack of shape and luminosity specifications
         * is parallel, stop if not - this happens is background comes
         * BETWEEN another set of shape and luminosity commands */
        if( rfield.nShape != p.m_nqh )
        {
                fprintf( ioQQQ, " This command has come between a previous ordered pair of continuum shape and luminosity commands.\n Reorder the commands to complete each continuum specification before starting another.\n" );
                fprintf( ioQQQ, " Sorry.\n" );
                cdEXIT(EXIT_FAILURE);
        }

        /* diffuse x-ray background from 
         * >>refer      cosmic  background      Ostriker and Ikeuchi ApJL 268, L63.
         * parameter on cmnd is redshift, followed by optional J21 
         * >>refer      cosmic  background      Ikeuchi, S.; Ostriker, J. P., 1986, ApJ 301, 522 */

        /* >>chng 02 aug 12, do not try to enter bare powerlaw, use table power law default instead */
        {
                // There must be a neater way than this to extract the
                // functionality from ParseTable...
                p.set_point(0);
                string cmdSave = p.getRawTail();
                p.setline("TABLE POWERLAW  ");
                ParseTable( p );
                p.setline(cmdSave.c_str());
                p.set_point(4);
        }

        /* now generate equivalent of luminosity command
         * enter phi(h), the number of h-ionizing photons/cm2 */

        strcpy( rfield.chRSpec[p.m_nqh], "SQCM" );
        strcpy( rfield.chSpNorm[p.m_nqh], "FLUX" );
        /* this is an isotropic radiation field */
        rfield.lgBeamed[p.m_nqh] = false;
        rfield.Illumination[p.m_nqh] = Illuminate::ISOTROPIC;

        /* this will be the redshift */
        z = p.FFmtRead();
        if( p.lgEOL() )
                z = 0.;

        /* optional scale factor */
        fac = p.FFmtRead();
        if( p.lgEOL() )
                fac = 1.0;

        /* this equation from Ostriker and Ikeuchi Ap.J.L 268, L63.
         * this should be J_nu into 4\pi sr
         * >>chng 96 jul 23, from ostriker to vedel, et al mnras 271, 743. */
        rfield.totpow[p.m_nqh] = (log10(PI4*fac*1.e-21/
                (1.+powi(5./(1.+z),4))));

        /* this is at 1 ryd for H
         * range(nqh,1) = 1.
         *>>chgn 96 dec 18, to H ioniz pot from 1 ryd */
        rfield.range[p.m_nqh][0] = HIONPOT;

        ++p.m_nqh;
        if( p.m_nqh >= LIMSPC )
        {
                fprintf( ioQQQ, " Too many continua entered; increase LIMSPC\n" );
                cdEXIT(EXIT_FAILURE);
        }

        /* add fireball unless NO FIREBALL or NO CMP in */
        if( !(p.nMatch("NO FI") || p.nMatch("NO CM") ) )
        {

                /* put in a black body */
                strcpy( rfield.chSpType[rfield.nShape], "BLACK" );
                /* >>chng 03 may 23, CMB temp from 2.756 to 2.725 */
                rfield.slope[rfield.nShape] = (CMB_TEMP*(1. + z));
                rfield.cutoff[rfield.nShape][0] = 0.;
                rfield.cutoff[rfield.nShape][1] = 0.;
                strcpy( rfield.chSpNorm[p.m_nqh], "LUMI" );
                a = log10(rfield.slope[rfield.nShape]);
                rlogl = log10(4.*STEFAN_BOLTZ) + 4.*a;
                strcpy( rfield.chRSpec[p.m_nqh], "SQCM" );
                rfield.range[p.m_nqh][0] = rfield.emm();
                rfield.range[p.m_nqh][1] = rfield.egamry();
                rfield.totpow[p.m_nqh] = rlogl;

                /* this flag says that CMB has been set */
                rfield.lgCMB_set = true;

                ++rfield.nShape;
                ++p.m_nqh;
                if( p.m_nqh >= LIMSPC )
                {
                        fprintf( ioQQQ, " Too many continua entered; increase LIMSPC\n" );
                        cdEXIT(EXIT_FAILURE);
                }
        }

        /* set radius to very large value if not already set */
        /* >>chng 01 jul 24, from Radius == 0 to this, as per PvH comments */
        if( !radius.lgRadiusKnown )
        {
                radius.Radius = exp10(radius.rdfalt);
        }
        return;
}