Large Scale Fluctuations in the X-Ray Background

Treyer, M A
Schärf, C A
Lahav, O
Jahoda, K
Boldt, E A
Piran, T

Publication date

January 1998

Abstract

We present an attempt to measure the large angular scale fluctuations in the X-Ray Background (XRB) from the HEAO1 A2 data, expressed in terms of spherical harmonics. We model the harmonic coefficients assuming a power spectrum and an epoch-dependent bias parameter, and using a phenomenological scenario describing the evolution of the X-ray sources. From the few low-order multipoles detected (l<10), we estimate the power-spectrum normalisation on scales intermediate between those explored by local galaxy redshift surveys (~ 100 Mpc) and by the COBE Microwave Background measurements (~ 1000 Mpc). We find that the HEAO1 harmonics are consistent with present epoch rms fluctuations of the X-ray sources bx(0)sigma8 ~ 1-2 in 8 Mpc spheres. Theref...

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Large Scale Fluctuations in the X-Ray Background

Abstract

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Large Scale Fluctuations in the X-Ray Background

Abstract

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