Determining gravitational masses of galaxy clusters with virial equilibrium and arclike images

Abstract

view Abstract Citations (30) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Determining Gravitational Masses of Galaxy Clusters with Virial Equilibrium and Arclike Images Wu, Xiang-Ping Abstract The mass derived from gravitational lensing reflects the total mass contained in the lensing system, independent of the specific matter contents and states. A comparison of the dynamical masses from hydrostatic equilibrium with the gravitational masses from arclike images of background galaxies is made for four clusters of galaxies at intermediate redshifts. It is found that virial analysis has underestimated the total cluster masses (from lensing) by a factor of ~3- 6 within a radius of ~0.3 Mpc h_50_^1^ around the cluster centers, indicating that clusters of galaxies might not be regarded as the well- relaxed virialized systems. The increase of the total cluster masses obtained from lensing leads to the decrease of the baryon fractions of clusters of galaxies, which provides a clue to solving the "{OMEGA}_0_ discrepancy puzzle" in cosmology. Publication: The Astrophysical Journal Pub Date: December 1994 DOI: 10.1086/187646 arXiv: arXiv:astro-ph/9406036 Bibcode: 1994ApJ...436L.115W Keywords: Dark Matter; Galactic Clusters; Gravitational Lenses; Nuclear Fusion; Virial Theorem; X Rays; Exosat Satellite; Gravitational Fields; Red Shift; Rosat Mission; Virial Coefficients; Astrophysics; COSMOLOGY: DARK MATTER; COSMOLOGY: GRAVITATIONAL LENSING; GALAXIES: CLUSTERING; Astrophysics E-Print: 11 pages plus 1 Table. LATEX style, submitted to ApJ, BAO-BGGC-9402 full text sources arXiv | ADS | data products SIMBAD (10) NED (4)