The surface brightness of the Galaxy at the Solar Neighbourhood

Details The surface brightness of the Galaxy at the Solar Neighbourhood The surface brightness of the Galaxy at the Solar Neighbourhood

2006-10-30

arxiv.org/abs/astro-ph/0610884v1

Astronomy and Astrophysics

Astrophysics

27 pages (including 13 pages of appendices), 45 figures; accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20066188

We present a new determination of the surface brightness of our Galaxy at the Solar Neighbourhood as observed from outside the Galaxy. We rely on various existing optical and infra-red surveys to obtain a multiwavelength estimate. On the one hand, scattered light does not contribute significantly to the surface brightness. On the other hand, optical and infrared integrated all-sky surveys (Pioneer 10/11 and COBE/DIRBE) show a systematically larger value than our synthetic local estimate based on Hipparcos data. This local estimate is also compatible with our Galactic simulations normalised at the Solar Neighbourhood and assuming an homogeneous stellar distribution. We interpret this disagreement as a signature of the presence of a local minimum of the stellar density compatible with Gould's belt. According to this result, the global luminosity of the Milky Way should follow the Tully-Fisher relation established for external galaxies.

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