Optical identification of the ASCA Lynx Deep Survey: An association of quasi-stellar objects and a supercluster at z = 1.3?

Journal article

Results of optical identification of the ASCA Lynx Deep Survey are presented. Six X-ray sources are detected in the 2-7 keV band using the Solid-State Imaging Spectrometer in a ∼20′ × 20′ field of view with fluxes larger than ∼4 × 10-14 ergs s -1 cm-2 in the band. Follow-up optical spectroscopic observations were made, and five out of six sources are identified with active galactic nuclei/quasi-stellar objects (AGNs/QSOs) at redshifts of 0.5-1.3. We also identify two more additional X-ray sources detected in a soft X-ray band with AGNs/QSOs. We find that three QSOs identified are located at z ∼ 1.3. Two rich clusters and several groups of galaxies are also placed at the same redshift in the surveyed field, and projected separations between the QSOs and the clusters are 3-8 Mpc at the redshift.

Authors: Ohta, K; Akiyama, M; Ueda, Y; Yamada, T; Nakanishi, K

• Publisher: Institute of Physics Publishing
• Journal: Astrophysical Journal
• Volume: 598
• Issue: 1 I
• Pages: 210-215
• Publication date: 2003-11-20
• DOI: 10.1086/378690
• EISSN: 1538-4357
• ISSN: 0004-637X
• Language: English
• Keywords: Surveys; Galaxies: clusters: general; Galaxies: active; Quasars: general; X-rays: general