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Durham University

Department of Physics

Staff profile

Publication details for Prof David Alexander

Saez, C., Lehmer, B.D., Bauer, F.E., Stern, D., Gonzales, A., Rreza, I., Alexander, D.M., Matsuda, Y., Geach, J.E., Harrison, F.A. & Hayashino, T. (2015). An extragalactic spectroscopic survey of the SSA22 field. Monthly Notices of the Royal Astronomical Society 450(3): 2615-2630.

Author(s) from Durham


We present Very Large Telescope VIMOS, Keck DEIMOS and Keck LRIS multi-object spectra of 367 sources in the field of the z ≈ 3.09 protocluster SSA22. Sources are spectroscopically classified via template matching, allowing new identifications for 206 extragalactic sources, including 36 z > 2 Lyman-break galaxies (LBGs) and Lyman α emitters (LAEs), eight protocluster members, and 94 X-ray sources from the ∼400 ks Chandra deep survey of SSA22. Additionally, in the area covered by our study, we have increased by ≈4, 13, and 6 times the number of reliable redshifts of sources at 1.0 < z < 2.0, at z > 3.4, and with X-ray emission, respectively. We compare our results with past spectroscopic surveys of SSA22 to investigate the completeness of the LBGs and the X-ray properties of the new spectroscopically classified sources in the SSA22 field.