Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475...11c&link_type=abstract
Astrophysical Journal v.475, p.11
Astronomy and Astrophysics
Astronomy
43
Cosmology: Dark Matter, Galaxies: Clusters: General, Galaxies: Photometry, Methods: Statistical, X-Rays: Galaxies
Scientific paper
A sample of 12 Abell clusters of galaxies has been studied in the optical and X-ray bands. The optical data are derived from automatic photometry based on microdensitometric scans of Palomar Schmidt F-band plates. ROSAT PSPC data were obtained from the public archive. Galaxy density and X-ray luminosity profiles have been constructed and deprojected by parametric and nonparametric techniques to obtain volume density profiles. We find a relation between the gas density rho gas and the galaxy density rho gal consistent with the prediction of the hydrostatic isothermal model. We confirm that more than 70% of the cluster mass is dark within 1.5 Mpc h^{-1}50 from the cluster center. Outside 250 kpc we find a nearly constant M/LV ratio, which on average is 137 M&sun;/L&sun;, implying that the galaxy mass traces the total matter distribution. The dark mass-to-light ratio has a similar behavior. We also find a baryonic fraction fb ~ 0.2, which, assumed as representative of the cosmic value and compared with nucleosynthesis calculations, constrains the cosmological parameter Omega 0 to be smaller than 0.25.
Cirimele Giuseppe
Nesci Roberto
Trevese Dario
No associations
LandOfFree
An X-Ray and Optical Study of Matter Distribution in Clusters of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An X-Ray and Optical Study of Matter Distribution in Clusters of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An X-Ray and Optical Study of Matter Distribution in Clusters of Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1785776