Gravitationally Lensed Sub-mm Sources towards Galaxy Clusters

• Main Author: Cooray, Asantha R.
• Format: Text
• Language: unknown
• Published: arXiv 1998
• Subjects: Astrophysics astro-ph; FOS Physical sciences; South Pole; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.astro-ph/9809071; https://arxiv.org/abs/astro-ph/9809071

Recent observations of galaxy clusters with the SCUBA instrument on the James Clarke Maxwell Telescope have revealed a sample of gravitationally lensed sources at sub-mm wavelengths. We extend our previous calculation on the expected number of lensed optical arcs and radio sources to study the sub-mm lensed source statistics due to foreground massive clusters. For a flat cosmology with Omega_m=0.4 and Omega_Lambda =0.6, we predict roughly 1.5 \times 10^4 lensed sub-mm sources with flux densities greater than 4 mJy at 850 microns, and with amplifications due to lensing greater than 2, towards galaxy clusters with X-ray luminosities greater than 8 x 10^44 h^-2 ergs s^-1 (0.3 to 3.5 keV band). We compare our predictions with observations from the SCUBA instrument, and briefly consider the possibility of using the South Pole 10-m sub-mm telescope and the Planck surveyor to identify lensed sub-mm sources. A catalog of around 100 gravitationally lensed sources at 353 GHz may be a useful by-product of Planck. : 4 pages, submitted to Astronomy and Astrophysics