Dust-corrected surface photometry of M 31 from the Spitzer far infrared observations

摘要: We create a model for recovering the intrinsic, absorption-corrected surface brightness distribution of galaxy and apply to M31. We construct galactic as superposition axially symmetric stellar components dust disc analyse intrinsic absorption efects. Dust column density is assumed be proportional far-infrared flux galaxy. Along each line sight, observed spectral energy approximated with modified black body functions considering different temperatures, allowing determine temperatures relative densities components. nearby M31 using Spitzer Space Telescope observations mapping temperature. A warm cold component are distinguished. The temperature in varies between 56 60 K highest spiral arms; mostly 15-19 rises up about 25 at centre intensity-weighted mean decreases from T ~32 ~20 R ~7 kpc outwards. also calculate UBVRIL distributions spatial luminosity distribution. extinction V-colour 0.25 mag 0.4-0.5 = 6-13 smoothly thereafter. calculated total extinction-corrected L_B (3.64 pm 0.15) 10^10L_sun, corresponding an absolute M_B (-20.89 0.04) mag. Of B-luminosity, 20% (0.24 mag) obscured us by inside shape bulge slightly prolate our best-fit model.