The axial ratio of the galactic stellar halo

Details The axial ratio of the galactic stellar halo The axial ratio of the galactic stellar halo

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l.149l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 2, p. L149-L152

Astronomy and Astrophysics

Astrophysics

34

Axial Stress, Galactic Halos, Globular Clusters, Spatial Distribution, Astronomical Catalogs, Brightness Distribution, Charge Coupled Devices, Luminosity

Scientific paper

We report our results for the axial ratio of the stellar halo based on star counts from the APS catalog of the Palomar Observatory Sky Survey (POSS) I. We have used counts from seven POSS I fields, 16 deg each, including the NGP plus six in the l = 90 deg/270 deg plane with absolute value of b = 40 deg and 50 deg. We investigate the dependence of the observed ratio on latitude and magnitude. The observed counts yield a mean ratio of 0.5 implying c/a less than or = 0.5 for a deprojected r1/4 law. When corrected for possible contamination by quasars and an extended/thick disk, the ratio increases to only 0.6. We conclude that there is a significant population of stars above the Galactic plane in a flattened distribution in addition to those already ascribed to an extended or thick disk.

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