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Detection of a CMB decrement towards the z = 3.8 quasar pair PC1643+4631A&B | | Michael E. Jones
; Richard Saunders
; Joanne C. Baker
; Garret Cotter
; Alastair Edge
; Keith Grainge
; Toby Haynes
; Anthony Lasenby
; Guy Pooley
; Huub Rottgering
; | | Date: |
26 Nov 1996 | | Subject: | astro-ph | | Affiliation: | MRAO Cambridge UK, IoA Cambridge UK Leiden Observatory | | Abstract: | In a 15-GHz Ryle-Telescope observation of PC1643+4631 A & B, a pair of quasars at redshifts z = 3.79 and 3.83 separated by 198 arcsec on the sky, we find a decrement in the cosmic microwave background (CMB) of -380 +/- 64 uJy in a 110 arcsec x 175 arcsec beam. Assuming this to be a Sunyaev-Zel’dovich effect due to an intervening cluster, the minimum magnitude of the central temperature decrement is 560 uK. 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} solar masses (assuming a temperature of ~ 5 keV), indicating a total mass of > 10^{15} solar masses. 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. | | Source: | arXiv, astro-ph/9611218 | | Services: | Forum | Review | PDF | Favorites | |
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