We present a new technique for calculating the fraction of dark material within the optical radius of spiral galaxies. The method employs the well-established observational result that spiral galaxies have similar central surface brightnesses, as well as published stellar synthesis evolutionary models, color-magnitude relations and optical rotation curves. No assumptions about the dark matter distribution are necessary. We find that the ratio of disk-to-dynamical mass within the optical radius increases roughly as L(B)0.4. This is in good agreement with the results of Persic and Salucci which are derived from independent considerations.
The Dark Matter Content of Spiral Galaxies / Salucci, P.; Ashman, K. M.; Persic, M.. - In: THE ASTROPHYSICAL JOURNAL. - ISSN 0004-637X. - 379:1(1991), pp. 89-93. [10.1086/170485]
The Dark Matter Content of Spiral Galaxies
Salucci, P.;
1991-01-01
Abstract
We present a new technique for calculating the fraction of dark material within the optical radius of spiral galaxies. The method employs the well-established observational result that spiral galaxies have similar central surface brightnesses, as well as published stellar synthesis evolutionary models, color-magnitude relations and optical rotation curves. No assumptions about the dark matter distribution are necessary. We find that the ratio of disk-to-dynamical mass within the optical radius increases roughly as L(B)0.4. This is in good agreement with the results of Persic and Salucci which are derived from independent considerations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.