Modelling the velocity field of elliptical galaxies on large scales

Details Modelling the velocity field of elliptical galaxies on large scales Modelling the velocity field of elliptical galaxies on large scales

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252....1w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 1-9.

Astronomy and Astrophysics

Astrophysics

2

Astrometry, Astronomical Models, Elliptical Galaxies, Radial Velocity, Red Shift, Scale (Ratio)

Scientific paper

The large-scale velocity field of elliptical galaxies is modeled here using an improved group catalog and a recent more accurate calibration of the log D(n)-log sigma relation for elliptical galaxies. The radius R(typical) of roughly 660 km/s/H(0) is determined by a local optimization procedure. In bulk and pure attractor models, the results are fairly compatible with previous work, while in a streaming plus attractor model, the attractor is so far away that the velocity field in the observed region is best described as bulk streaming together with a weak linear trend. In this case, the velocity at the Local Group has magnitude 506 km/s in the direction (l = 352.3 deg, b = 2.5 deg), and the components of the field vary by about 5 percent in the observed region. Depending on the model, estimates ranging from about 640-890 km/s are obtained for the residual dispersion of the velocity field. Results of Chi-square tests suggest that it should be possible to extract more information about the velocity field from these data than given by any of the above models.

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