Detection of a Cosmic Microwave Background Decrement toward the ital Z = 3.8 Quasar Pair PC 1643+4631A,B

Details Detection of a Cosmic Microwave Background Decrement toward the ital Z = 3.8 Quasar Pair PC 1643+4631A,B Detection of a Cosmic Microwave Background Decrement toward the ital Z = 3.8 Quasar Pair PC 1643+4631A,B

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...479l...1j&link_type=abstract

Astrophysical Journal Letters v.479, p.L1

Astronomy and Astrophysics

Astronomy

55

Cosmology: Cosmic Microwave Background, Galaxies: Clusters: General, Galaxies: Quasars: Individual Alphanumeric: Pc 1643+4631A, B

Scientific paper

In a 15 GHz Ryle Telescope observation of PC 1643+4631A, B, a pair of quasars at redshifts z = 3.79 and 3.83 separated by 198" on the sky, we find a decrement in the cosmic microwave background (CMB) of -380 +/- 64 mu Jy in a 110" x 175" beam. Assuming this to be a Sunyaev-Zeldovich effect due to an intervening cluster, the minimum magnitude of the central temperature decrement is 560 mu K. A serendipitous ROSAT observation shows that there is no X-ray--luminous cluster in the direction of the decrement at z < 1. The implied gas mass is >~2 x 1014 Msolar (assuming a temperature of ~5 keV), indicating a total mass of more than 1015 Msolar. This result demonstrates the existence of a massive system too distant to be detected by its emission, but which can be found via its imprint on the CMB.

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