Faint surface photometry of the halo of M31

Details Faint surface photometry of the halo of M31 Faint surface photometry of the halo of M31

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1730p&link_type=abstract

The Astronomical Journal, vol. 107, no. 5, p. 1730-1736

Astronomy and Astrophysics

Astronomy

81

Andromeda Galaxy, Astronomical Photometry, Brightness Distribution, Faint Objects, Galactic Halos, Milky Way Galaxy, Red Giant Stars, Charge Coupled Devices, Counting, Optical Filters, Telescopes

Scientific paper

Counts of stars near the tip of the red giant branch have been used to estimate the surface brightness of the halo of M31 down to a level of muV approximately equals 30 mag arcsec-2 (R approximately equals 20 kpc). Over the range 0.2 approximately less than R(kpc) approximately less than 20 the surface brightness distribution in the halo of the Andromeda galaxy is well-represented by a single de Vaucouleurs law. Alternatively, the outer halo of M31 can also be modelled by a power-law density distribution of the form rho (R) varies as R-5. This result suggests that the globular cluster component of the halo of M31 (for which rho varies as R-3) is more extended than the stellar halo of this galaxy. At muV approximately equals 28 mag arcsec-2 (R approximately equals 10 kpc), the axial ratio of the halo of M31 is found to be b/a = 0.55 +/- 0.05.

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