Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3805d&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #38.05; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
Using the NYU Value-Added Galaxy Catalog (NYU-VAGC) I examine the line-of-site velocity dispersion of satellite galaxies orbiting larger, isolated, primary galaxies. The line-of-sight dispersion can be directly compared to the functional form of three models (NFW, MOND and a relic neutrino based model) that diverge at large distances allowing discrimination between models. I find that the velocity dispersion decreases with projected distance from the primary. >From the data I find no evidence of the Holmberg effect. Satellite galaxies tend to be isotropic both at small projected distances from the primary galaxy and at large projected distances (at the 1 sigma level) from the primary galaxy. However, I do find that the distribution of early type satellites tends to decline more steeply than the late type satellites in a high magnitude primary sample. I was also able to examine the line-of-sight velocity dispersions in two directions: parallel to the plane of the galaxy and perpendicular to the plane of the galaxy along the axis of rotation. From sampling the velocity profiles of primary galaxies at different tilt angles relative to the axis of rotation, I find that the velocity distribution of satellites is isotropic about the primary, suggesting that the dark matter halo is spherical in shape.
Diaz Abel
Wilhelm Rainer
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