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; Huud Röttoering

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, Huud Röttoering

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 μJy in a 110″ × 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 μK. 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 × 10¹⁴ M_⊙ (assuming a temperature of ∼5 keV), indicating a total mass of more than 10¹⁵ M_⊙. 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.

Original language	English
Pages (from-to)	L1-L3
Number of pages	3
Journal	Astrophysical Journal
Volume	479
Issue number	1 PART II
Publication status	Published - 1 Jan 1997

Keywords

Cosmic microwave background
Galaxies: clusters: general

Cite this

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title = "Detection of a cosmic microwave background decrement toward the z = 3.8 quasar pair PC 1643+4631A, B",

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 μJy in a 110″ × 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 μK. 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 × 1014 M⊙ (assuming a temperature of ∼5 keV), indicating a total mass of more than 1015 M⊙. 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.",

keywords = "Cosmic microwave background, Galaxies: clusters: general",

author = "Jones, {Michael E.} and Richard Saunders and Baker, {Joanne C.} and Garret Cotter and Alastair Edge and Keith Grainge and Toby Haynes and Anthony Lasenby and Guy Pooley and Huud R{\"o}ttoering",

year = "1997",

month = jan,

day = "1",

language = "English",

volume = "479",

pages = "L1--L3",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Detection of a cosmic microwave background decrement toward the z = 3.8 quasar pair PC 1643+4631A, B

AU - Jones, Michael E.

AU - Saunders, Richard

AU - Baker, Joanne C.

AU - Cotter, Garret

AU - Edge, Alastair

AU - Grainge, Keith

AU - Haynes, Toby

AU - Lasenby, Anthony

AU - Pooley, Guy

AU - Röttoering, Huud

PY - 1997/1/1

Y1 - 1997/1/1

N2 - 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 μJy in a 110″ × 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 μK. 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 × 1014 M⊙ (assuming a temperature of ∼5 keV), indicating a total mass of more than 1015 M⊙. 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.

AB - 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 μJy in a 110″ × 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 μK. 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 × 1014 M⊙ (assuming a temperature of ∼5 keV), indicating a total mass of more than 1015 M⊙. 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.

KW - Cosmic microwave background

KW - Galaxies: clusters: general

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M3 - Article

AN - SCOPUS:21744443531

SN - 0004-637X

VL - 479

SP - L1-L3

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART II

ER -

Detection of a cosmic microwave background decrement toward the z = 3.8 quasar pair PC 1643+4631A, B

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