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Mass/Luminosity Ratios from Rotation of HI in so Galaxies

Published online by Cambridge University Press:  04 August 2017

Wim van Driel  and
Hugo van Woerden
Wim van Driel
Affiliation:
Kapteyn Astronomical Institute, Groningen, The Netherlands
Hugo van Woerden
Affiliation:
Kapteyn Astronomical Institute, Groningen, The Netherlands

Extract

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At Westerbork, we have mapped the distribution and motions of HI in about twenty gas-rich SO and SO/a galaxies, with resolutions of order 30 arcsec. Gas-rich SO's often have most of their HI in an outer ring, with diameters between 0.9 and 2.5 times the optical (D0). Assuming circular shape and motions for this ring, radius R, and a spherical distribution of matter, we derive the inclination and rotation speed of the ring, the amount of mass MT(R) interior to it and the corresponding ratio MT/LB0 to blue luminosity.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 117: Dark Matter in the Universe , 1987 , pp. 83 - 84
Copyright
Copyright © Reidel 1987 

References

Shostak, G.S. 1978, Astron. Astrophys. 68, 321 Google Scholar
Van Woerden, H., van Driel, W. and Schwarz, U.J. 1983, IAU Symp. 100, p.99 Google Scholar