The effect of massive disks on bulge isophotes

Details The effect of massive disks on bulge isophotes The effect of massive disks on bulge isophotes

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..454m&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 454-458. Research supported by the Research Corp.

Astronomy and Astrophysics

Astrophysics

59

Astronomical Photometry, Disk Galaxies, Galactic Structure, Isophotes, Equipotentials, Milky Way Galaxy, Stellar Mass

Scientific paper

Massive disks produce flattened equipotentials. Unless the stars in a galaxy bulge are preferentially hotter in the z direction than in the plane, the isophotes will be at least as flat as the equipotentials. The comparison of two galaxy models having flat rotation curves with the available surface photometry for five external galaxies does not restrict the mass fraction which might reside in the disk. However, star counts in our own Galaxy indicate that unless the disk terminates close to the solar circle, no more than half the mass within that circle lies in the disk. The remaining half must lie either in the bulge or, more probably, in a third dark, round, dynamically distinct component.

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