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Date and Time of the Query: 2019-07-20 T05:37:44 PDT
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For refcode 1997ApJ...479L...1J:
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Copyright by American Astronomical Society. Reproduced by permission
1997ApJ...479L...1J Detection of a Cosmic Microwave Background Decrement toward the z = 3.8 Quasar Pair PC 1643+4631A, B MICHAEL E. JONES, RICHARD SAUNDERS, JOANNE C. BAKER, GARRET COTTER, ALASTAIR EDGE, KEITH GRAINGE, TOBY HAYNES, ANTHONY LASENBY, GUY POOLEY, AND HUUB ROTTGERING Received 1996 May 21; accepted 1997 January 22 ABSTRACT 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 microJy 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 microK. 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 10^14^ M_sun_ (assuming a temperature of ~5 keV), indicating a total mass of more than 10^15^ M_sun_. 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. Subject headings: cosmic microwave background-galaxies: clusters: general-quasars: individual (PC 1643+4631A, B)
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