In [1]:

    

from astropy.io import fits
import scipy
from scipy import ndimage
import numpy as np
import glob

from ppxf import ppxf
import ppxf_util as util


    

In [8]:

    

directory = 'spectra/'
file = directory + 'NGC4550_SAURON.fits'

hdu = fits.open(file)
#print dir(hdu[0].header)
#print hdu[0].header.keys
#print hdu[0].data
print 'CRVAL1', hdu[0].header['CRVAL1'] # CRVAL1 is the wavelength at the reference pixel (Angstroms)
print 'CDELT1', hdu[0].header['CDELT1'] # CDELT1 is the increment for the wavelength grid (Angstroms)
print 'NAXIS1', hdu[0].header['NAXIS1'] # NAXIS1 is the number of values in the spectrum

h1 = hdu[0].header
h1['CRVAL1'] + np.array([0.,h1['CDELT1']*(h1['NAXIS1']-1)])


    

    




CRVAL1 4824.6
CDELT1 1.1
NAXIS1 415






    
Out[8]:





array([ 4824.6,  5280. ])

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