Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.305..412c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 305, Issue 2, pp. 412-416.
Astronomy and Astrophysics
Astronomy
2
Galaxies: Nuclei, Cosmology: Observations, Gravitational Lensing
Scientific paper
Foreground massive galaxy clusters are expected to gravitationally lens background sources. Here, we calculate the expected number of gravitationally lensed X-ray sources on the sky owing to foreground galaxy clusters for different cosmological models. We describe the background sources using flux and redshift distribution observed in the ROSAT Deep Survey towards the `Lockman' hole, and model the foreground galaxy clusters as isothermal spheres. We account for the redshift evolution of lensing clusters using a Press-Schechter analysis with normalizations based on the observed cluster temperature function. For a flat cosmology with Ο_m=0.3 and Ο_Lambda = 0.7, we predict ~ 10^3 lensed sources with fluxes larger than ~ 5 x 10^-15 erg cm^-2 s^-1 and ~ 10^4 sources with fluxes larger than ~ 10^-16 erg cm^-2 s^-1 in the 0.5-2.5 keV band. We discuss the possibility of detecting lensed X-ray sources towards clusters in deep AXAF observations. The planned AXAF guaranteed time observation of A370 with an exposure of 90 ks is likely to recover at least two lensed active galactic nuclei (AGNs) above the 3 sigma level. Aided by amplification owing to gravitational lensing, the search for lensed X-ray sources towards clusters is likely to recover AGNs at redshifts of 1-4.
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