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@adonath
Created July 28, 2015 13:48
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Fermi 3FGL Spectrum Plot
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{
"cells": [
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Populating the interactive namespace from numpy and matplotlib\n"
]
}
],
"source": [
"%pylab inline"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"from astropy.units import Quantity\n",
"from astropy.table import QTable\n",
"from astropy.modeling.models import PowerLaw1D\n",
"from gammapy.catalog import get_source_by_name\n",
"from gammapy.spectrum import energy_bin_centers_log_spacing, compute_differential_flux_points"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"catalog = QTable.read('../../Downloads/gll_psc_v16.fit')\n",
"source = get_source_by_name('3FGL J0000.1+6545 ', catalog) # For some reason there's whitespace after the name"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/latex": [
"$1.0053431 \\times 10^{-12} \\; \\mathrm{\\frac{ph}{MeV\\,s\\,cm^{2}}}$"
],
"text/plain": [
"<Quantity 1.005343052730423e-12 ph / (cm2 MeV s)>"
]
},
"execution_count": 5,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"source['Flux_Density']"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/latex": [
"$1159.0813 \\; \\mathrm{MeV}$"
],
"text/plain": [
"<Quantity 1159.081298828125 MeV>"
]
},
"execution_count": 6,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"source['Pivot_Energy']"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"y_model = PowerLaw1D(amplitude=source['Flux_Density'].value,\n",
" x_0=source['Pivot_Energy'].value,\n",
" alpha=source['Spectral_Index'])\n",
"x_model = Quantity(np.logspace(-2, 2, 100), 'GeV').to('MeV').value"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"xbins = Quantity([0.03, 0.1, 0.3, 1, 3, 10, 100], 'GeV').to('MeV')\n",
"x = energy_bin_centers_log_spacing(xbins).value\n",
"\n",
"flux_columns = ['Flux30_100', 'Flux100_300', 'Flux300_1000',\n",
" 'Flux1000_3000', 'Flux3000_10000', 'Flux10000_100000']\n",
"\n",
"y = np.array([source[_].value for _ in flux_columns])"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/plain": [
"<matplotlib.text.Text at 0x7f56ed570910>"
]
},
"execution_count": 12,
"metadata": {},
"output_type": "execute_result"
},
{
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],
"text/plain": [
"<matplotlib.figure.Figure at 0x7f56ed7a00d0>"
]
},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"scatter(x, y / x)\n",
"plot(x_model, y_model(x_model))\n",
"ylim(1E-17, 1E-8)\n",
"loglog()\n",
"xlabel('Energy (MeV)')\n",
"ylabel('Flux Density (ph / (MeV cm^2 s))')"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
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