Physical state of the intergalactic medium at redshifts z= 2-4

Details Physical state of the intergalactic medium at redshifts z= 2-4 Physical state of the intergalactic medium at redshifts z= 2-4

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.354..183d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 354, Issue 1, pp. 183-192.

Astronomy and Astrophysics

Astronomy

3

Surveys, Quasars: Absorption Lines, Quasars: General, Large-Scale Structure Of Universe

Scientific paper

We use two large surveys of quasars (QSOs), namely, 2QZ-6QZ and SDSS DR1, to estimate mean properties of the background ultraviolet (UV) radiation and the temperature of intergalactic gas at redshifts z~ 2-4. We show that the intensity of the UV background radiation as estimated by Haardt & Madau (1996) should be increased by ~20-30 per cent. We also briefly discuss spatial variations of both the intensity of background UV radiation and the gas temperature. These variations can be studied in more detail with high-resolution observations of the proximity effects, Lyman α absorbers and metal systems. Using the minimal spanning tree technique, we analyse the spatial distribution of QSOs and show that it is quite similar to random (Poissonian).

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