SIMBAD references

2000ApJ...533L..93B - Astrophys. J., 533, L93-L97 (2000/April-3)

Detecting the gravitational redshift of cluster gas.


Abstract (from CDS):

We examine the gravitational redshift of radiation emitted from within the potential of a cluster. Spectral lines from the intracluster medium (ICM) are redshifted in proportion to the emission-weighted mean potential along the line of sight, amounting to ~50 km.s–1 at a radius of 100 kpc h–1, for a cluster dispersion of 1200 km.s–1. We show that the relative redshifts of different ionization states of metals in the ICM provide a unique probe of the three-dimensional matter distribution. An examination of the reported peculiar velocities of cD galaxies in well-studied Abell clusters reveals that they are typically redshifted by an average of ∼200 km.s–1. This can be achieved by gravity with the addition of a steep central potential associated with the cD galaxy. Note that, in general, gravitational redshifts cause a small overestimate of the recessional velocities of clusters by an average of ∼20 km.s–1.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Galaxies: Clusters: General - Techniques: Spectroscopic - X-Rays: Galaxies

Simbad objects: 10

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