Alternate meaning: WMAP (AM)
The Wilkinson Microwave Anisotropy Probe (WMAP) is a NASA satellite whose mission is to survey the sky to measure the temperature of the radiant heat left over from the Big Bang. The satellite was launched by a Delta II rocket on June 30, 2001, at 3:46 p.m. EDT from Cape Canaveral Air Force Station, Florida, USA.
The goal of WMAP is to map out minute differences in the Cosmic Microwave Background (CMB) radiation in order to help test theories of the nature of the universe. It is the successor to COBE and one of the series o ...
9C
The Ninth Cambridge Catalog of Radio Sources (9C) is an astronomical catalogue of celestial radio sources as measured at 15-GHz. It was published in 2003 by the Cavendish Astrophysics Group of the University of Cambridge. The catalogue was originally made in order to locate radio sources which were interfering with observations using the Very Small Array, but the catalogue has also proved useful for other astronomical programs.
Sources are labelled 9CJHHMM+DDMM where HHMM+DDMM are the coordinates in the J2000 system, e.g. 9CJ1510+4138.
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The Cluster's mean distance from Earth is 140 Mpc (450 million light years). Its 10 brightest spiral galaxies have apparent magnitudes of 13-14 mag which already can be made out by amateur telescopes larger than 20 cm.
The image shows the central region, dominated by two giant Ellipticals and therefore is of type B (binary core): The two central cD galaxies dominate the gravity field of the whole system, and therefore the orbit velocity of its single members differ 'only' by about 150 km per second. The largest central Elliptical is (NGC 4884 = NGC 4889) with ...
As is usual for clusters of this richness, the galaxies are overwhelmingly elliptical and S0 galaxies, with only a few spirals of younger age, and many of them probably near the outskirts of the cluster. Most of the objects in the picture above are galaxies; only the very bright objects with diffraction spikes and the smallest circular dots are foreground stars of our own Galaxy.
The large dimension of the Galaxy cluster was detected not till than in the 1950ies, mainly by astronomers of the Mount Palomar observatory. But in the clust ...
