示例#1
0
# generate a high temporal resolution SFH, with bursts if f_burst > 0
lt, sfr, tb = bsp.burst_sfh(sfh=sfh, fwhm_burst=fwhm_burst, f_burst=f_burst, contrast=contrast)
# get the interpolation weights.  This does not have to be run in
# general (it is run interior to bursty_sps) unless you are
# debugging or for plotting purposes
aw = bsp.sfh_weights(lt, sfr, 10**sps.ssp_ages, lookback_time=lookback_time)
# get the intrinsic spectra at the lookback_times specified.
wave, spec, mstar, _ = bsp.bursty_sps(lt, sfr, sps, lookback_time=lookback_time)
# get reddened spectra, Calzetti foreground screen
wave, red_spec, _, lir = bsp.bursty_sps(lt, sfr, sps,
                                        lookback_time=lookback_time,
                                        dust_curve=attenuation.calzetti,
                                        av=1, dav=0)
# get reddened spectra, SexA differntial extinction plus SMC
dav = sexAmodel(davmax=1.0, ages=10**sps.ssp_ages)
wave, red_spec, _, lir = bsp.bursty_sps(lt, sfr, sps,
                                        lookback_time=lookback_time,
                                        dust_curve=attenuation.smc,
                                        av=1, dav=dav)

# Get intrinsic spectrum including an age metallicity relation
def amr(ages, **extras):
    """This should take an array of ages (linear years) and return an array
    of metallicities (units of log(Z/Z_sun)
    """
    logz_array = -1.0 * np.ones_like(ages)
    return logz_array

wave, spec, mstar, _ = bsp.bursty_sps(lt, sfr, sps, lookback_time=lookback_time,
                                      logzsol=amr(10**sps.ssp_ages, sfh=sfh))
示例#2
0
def examples(filename='demo/sfhs/ddo75.lowres.ben.v1.sfh',
             lookback_time=[0.0, 1e9, 10e9]):
    """
    A quick test and demonstration of the algorithms.
    """
    import matplotlib.pyplot as pl
    import fsps
    from scombine.sfhutils import load_angst_sfh

    # Instantiate the SPS object and make any changes to the parameters here
    sps = fsps.StellarPopulation(zcontinuous=1)
    sps.params['logzsol'] = -1.0

    # Load the input SFH, and set any bursts if desired (set f_burst=0
    # to not add bursts)
    f_burst, fwhm_burst, contrast = 0.5, 0.05 * 1e9, 5
    sfh = load_angst_sfh(filename)
    sfh['t1'] = 10.**sfh['t1']
    sfh['t2'] = 10.**sfh['t2']
    sfh['sfr'][0] *=  1 - (sfh['t1'][0]/sfh['t2'][0])
    sfh[0]['t1'] = 0.
    mtot = ((sfh['t2'] - sfh['t1']) * sfh['sfr']).sum()
    
    # generate a high temporal resolution SFH, with bursts if f_burst > 0
    lt, sfr, tb = burst_sfh(sfh=sfh, fwhm_burst=fwhm_burst, f_burst=f_burst, contrast=contrast)
    # get the interpolation weights.  This does not have to be run in
    # general (it is run interior to bursty_sps) unless you are
    # debugging or for plotting purposes
    aw = sfh_weights(lt, sfr, 10**sps.ssp_ages, lookback_time=lookback_time)
    # get the intrinsic spectra at the lookback_times specified.
    wave, spec, mstar, _ = bursty_sps(lt, sfr, sps, lookback_time=lookback_time)
    # get reddened spectra, Calzetti foreground screen
    wave, red_spec, _, lir = bursty_sps(lt, sfr, sps, lookback_time=lookback_time,
                                        dust_curve=attenuation.calzetti, av=1, dav=0)
    # get reddened spectra, SexA differntial extinction plus SMC
    from scombine.dust import sexAmodel
    dav = sexAmodel(davmax=1.0, ages=10**sps.ssp_ages)
    wave, red_spec, _, lir = bursty_sps(lt, sfr, sps, lookback_time=lookback_time,
                                        dust_curve=attenuation.smc, av=1, dav=dav)
    
    # Get intrinsic spectrum including an age metallicity relation
    def amr(ages, **extras):
        """This should take an array of ages (linear years) and return an array
        of metallicities (units of log(Z/Z_sun)
        """
        logz_array = -1.0 * np.ones_like(ages)
        return logz_array
    wave, spec, mstar, _ = bursty_sps(lt, sfr, sps, lookback_time=lookback_time,
                                      logzsol=amr(10**sps.ssp_ages, sfh=sfh))
    
    
    # Output plotting.
    pl.figure()
    for i,t in enumerate(lookback_time):
        pl.plot(wave, spec[i,:], label = r'$t_{{lookback}} = ${0:5.1f} Gyr'.format(t/1e9))
    pl.legend()
    pl.xlim(1e3,1e4)
    pl.xlabel('wave')
    pl.ylabel(r'$F_\lambda$')

    fig, ax = pl.subplots(2,1)
    for i,t in enumerate(lookback_time):
        ax[1].plot(10**sps.ssp_ages, aw[i,:], marker='o', markersize=2,
                   label=r'$t_{{lookback}} = ${0:5.1f} Gyr'.format(t/1e9))
        mstring = 'm_formed({0:3.1f}Gyr)={1}, m_formed(total)={2}, m_formed({0:3.1f}Gyr)/m_formed(total)={3}'
        print(mstring.format(t/1e9, aw[i,:].sum(), mtot, aw[i,:].sum()/mtot))
        print('m_star({0:3.1f}Gyr)={1}'.format(t/1e9, mstar[i]))
    ax[1].set_xlabel('SSP age - lookback time')
    ax[1].set_ylabel('Mass')
    ax[1].legend(loc = 'upper left')

    ax[0].plot(lt, sfr, 'k')
    ax[0].set_xlabel('lookback time')
    ax[0].set_ylabel('SFR')
    pstring = 'f$_{{burst}}={0:3.1f}$, fwhm$_{{burst}}=${1:3.0f}Myr, contrast ={2}'
    ax[0].set_title(pstring.format(f_burst, fwhm_burst/1e6, contrast))
    for t in lookback_time:
        ax[0].axvline(x = t, color = 'r', linestyle =':', linewidth = 5)
    pl.show()
示例#3
0
lookback_time = [0, 1e8]

# generate a high temporal resolution SFH, with bursts if f_burst > 0
lt, sfr, tb = bsp.burst_sfh(sfh=sfh, fwhm_burst=fwhm_burst, f_burst=f_burst, contrast=contrast)
# get the interpolation weights.  This does not have to be run in
# general (it is run interior to bursty_sps) unless you are
# debugging or for plotting purposes
aw = bsp.sfh_weights(lt, sfr, 10 ** sps.ssp_ages, lookback_time=lookback_time)
# get the intrinsic spectra at the lookback_times specified.
wave, spec, mstar, _ = bsp.bursty_sps(lt, sfr, sps, lookback_time=lookback_time)
# get reddened spectra, Calzetti foreground screen
wave, red_spec, _, lir = bsp.bursty_sps(
    lt, sfr, sps, lookback_time=lookback_time, dust_curve=attenuation.calzetti, av=1, dav=0
)
# get reddened spectra, SexA differntial extinction plus SMC
dav = sexAmodel(davmax=1.0, ages=10 ** sps.ssp_ages)
wave, red_spec, _, lir = bsp.bursty_sps(
    lt, sfr, sps, lookback_time=lookback_time, dust_curve=attenuation.smc, av=1, dav=dav
)

# Get intrinsic spectrum including an age metallicity relation
def amr(ages, **extras):
    """This should take an array of ages (linear years) and return an array
    of metallicities (units of log(Z/Z_sun)
    """
    logz_array = -1.0 * np.ones_like(ages)
    return logz_array


wave, spec, mstar, _ = bsp.bursty_sps(
    lt, sfr, sps, lookback_time=lookback_time, logzsol=amr(10 ** sps.ssp_ages, sfh=sfh)
示例#4
0
def examples(filename='demo/sfhs/ddo75.lowres.ben.v1.sfh',
             lookback_time=[0.0, 1e9, 10e9]):
    """
    A quick test and demonstration of the algorithms.
    """
    import matplotlib.pyplot as pl
    import fsps
    from scombine.sfhutils import load_angst_sfh

    # Instantiate the SPS object and make any changes to the parameters here
    sps = fsps.StellarPopulation(zcontinuous=1)
    sps.params['logzsol'] = -1.0

    # Load the input SFH, and set any bursts if desired (set f_burst=0
    # to not add bursts)
    f_burst, fwhm_burst, contrast = 0.5, 0.05 * 1e9, 5
    sfh = load_angst_sfh(filename)
    sfh['t1'] = 10.**sfh['t1']
    sfh['t2'] = 10.**sfh['t2']
    sfh['sfr'][0] *= 1 - (sfh['t1'][0] / sfh['t2'][0])
    sfh[0]['t1'] = 0.
    mtot = ((sfh['t2'] - sfh['t1']) * sfh['sfr']).sum()

    # generate a high temporal resolution SFH, with bursts if f_burst > 0
    lt, sfr, tb = burst_sfh(sfh=sfh,
                            fwhm_burst=fwhm_burst,
                            f_burst=f_burst,
                            contrast=contrast)
    # get the interpolation weights.  This does not have to be run in
    # general (it is run interior to bursty_sps) unless you are
    # debugging or for plotting purposes
    aw = sfh_weights(lt, sfr, 10**sps.ssp_ages, lookback_time=lookback_time)
    # get the intrinsic spectra at the lookback_times specified.
    wave, spec, mstar, _ = bursty_sps(lt,
                                      sfr,
                                      sps,
                                      lookback_time=lookback_time)
    # get reddened spectra, Calzetti foreground screen
    wave, red_spec, _, lir = bursty_sps(lt,
                                        sfr,
                                        sps,
                                        lookback_time=lookback_time,
                                        dust_curve=attenuation.calzetti,
                                        av=1,
                                        dav=0)
    # get reddened spectra, SexA differntial extinction plus SMC
    from scombine.dust import sexAmodel
    dav = sexAmodel(davmax=1.0, ages=10**sps.ssp_ages)
    wave, red_spec, _, lir = bursty_sps(lt,
                                        sfr,
                                        sps,
                                        lookback_time=lookback_time,
                                        dust_curve=attenuation.smc,
                                        av=1,
                                        dav=dav)

    # Get intrinsic spectrum including an age metallicity relation
    def amr(ages, **extras):
        """This should take an array of ages (linear years) and return an array
        of metallicities (units of log(Z/Z_sun)
        """
        logz_array = -1.0 * np.ones_like(ages)
        return logz_array

    wave, spec, mstar, _ = bursty_sps(lt,
                                      sfr,
                                      sps,
                                      lookback_time=lookback_time,
                                      logzsol=amr(10**sps.ssp_ages, sfh=sfh))

    # Output plotting.
    pl.figure()
    for i, t in enumerate(lookback_time):
        pl.plot(wave,
                spec[i, :],
                label=r'$t_{{lookback}} = ${0:5.1f} Gyr'.format(t / 1e9))
    pl.legend()
    pl.xlim(1e3, 1e4)
    pl.xlabel('wave')
    pl.ylabel(r'$F_\lambda$')

    fig, ax = pl.subplots(2, 1)
    for i, t in enumerate(lookback_time):
        ax[1].plot(10**sps.ssp_ages,
                   aw[i, :],
                   marker='o',
                   markersize=2,
                   label=r'$t_{{lookback}} = ${0:5.1f} Gyr'.format(t / 1e9))
        mstring = 'm_formed({0:3.1f}Gyr)={1}, m_formed(total)={2}, m_formed({0:3.1f}Gyr)/m_formed(total)={3}'
        print(
            mstring.format(t / 1e9, aw[i, :].sum(), mtot,
                           aw[i, :].sum() / mtot))
        print('m_star({0:3.1f}Gyr)={1}'.format(t / 1e9, mstar[i]))
    ax[1].set_xlabel('SSP age - lookback time')
    ax[1].set_ylabel('Mass')
    ax[1].legend(loc='upper left')

    ax[0].plot(lt, sfr, 'k')
    ax[0].set_xlabel('lookback time')
    ax[0].set_ylabel('SFR')
    pstring = 'f$_{{burst}}={0:3.1f}$, fwhm$_{{burst}}=${1:3.0f}Myr, contrast ={2}'
    ax[0].set_title(pstring.format(f_burst, fwhm_burst / 1e6, contrast))
    for t in lookback_time:
        ax[0].axvline(x=t, color='r', linestyle=':', linewidth=5)
    pl.show()