Could a Local Group X-Ray Halo Affect the X-Ray and Microwave Backgrounds?

Details Could a Local Group X-Ray Halo Affect the X-Ray and Microwave Backgrounds? Could a Local Group X-Ray Halo Affect the X-Ray and Microwave Backgrounds?

1996-08-08

arxiv.org/abs/astro-ph/9608039v1

Astronomy and Astrophysics

Astrophysics

8 pages, to appear in The Astrophysical Journal Letters, paper can also be obtained at http://hea-www.harvard.edu/~pildis/smio

Scientific paper

10.1086/310304

Suto et al. (1996, astro-ph/9602061 and ApJ, 461, L33) have suggested that an X-ray halo in the Local Group might explain both the observed low-energy excess in the X-ray background and the quadrupole anisotropy in the cosmic microwave background. Recent observations of poor groups of galaxies by the ROSAT PSPC set reasonable limits on how extensive and dense such a halo could be. The poor groups most similar to the Local Group do not have a detectable halo, and the upper limits of these observations suggest that any Local Group halo would be nearly two orders of magnitude too tenuous to produce the effects Suto et al. (1996) discuss. In particular, the Sunyaev-Zel'dovich effect cannot contribute significantly to the quadrupole anisotropy measured by COBE.

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