On the origin of the diffuse X-ray background

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168091· OSTI ID:7145643

Subrahmanyan, R; Cowsik, R ^[1]

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1. Tata Institute of Fundamental Research, Bombay (India) Tata Institute of Fundamental Research, Ootacamund (India)

The possibility that the diffuse X-ray background (XRB) could have been generated by the infall of baryons into the potential wells of dark matter is investigated within the framework of a hot dark matter (neutrino)-dominated universe. The XRB spectrum is fitted with the thermal bremsstrahlung kernel, and constraints on the nature of the infall and properties of the X-ray emitting gas are derived. The results indicate that around xi = 5 infall results in the formation of high-density knots with a hot plasma phase constituting 1 percent or less of the baryonic content of the universe. These dense regions can be regarded as the progenitors of present-day galaxies. Constraints are also derived for forms of dark matter other than neutrinos. 60 refs.

• OSTI ID: 7145643
• Journal Information: Astrophysical Journal; (USA), Vol. 347; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BACKGROUND RADIATION
ORIGIN
COSMIC PHOTONS
BARYONS
BREMSSTRAHLUNG
COSMOLOGY
HOT PLASMA
INTERGALACTIC SPACE
NONLUMINOUS MATTER
RELICT RADIATION
SPATIAL DISTRIBUTION
UNIVERSE
X-RAY SPECTRA
COSMIC RADIATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
IONIZING RADIATIONS
MASSLESS PARTICLES
MICROWAVE RADIATION
PHOTONS
PLASMA
RADIATIONS
SPACE
SPECTRA
640106* - Astrophysics & Cosmology- Cosmology