Optical Identification of the ASCA Lynx Deep Survey: An Association of Quasi-Stellar Objects and a Supercluster at z=1.3?

@article{Ohta2003OpticalIO,
  title={Optical Identification of the ASCA Lynx Deep Survey: An Association of Quasi-Stellar Objects and a Supercluster at z=1.3?},
  author={Kouji Ohta and Masayuki Akiyama and Yoshihiro Ueda and Toru Yamada and Kouichiro Nakanishi and Gavin B. Dalton and Yasushi Ogasaka and Tsuneo Kii and Kiyoshi Hayashida},
  journal={The Astrophysical Journal},
  year={2003},
  volume={598},
  pages={210-215}
}
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… 
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References

SHOWING 1-10 OF 25 REFERENCES
Optical Identification of the ASCA Medium Sensitivity Survey in the Northern Sky: Nature of Hard X-Ray-Selected Luminous Active Galactic Nuclei*
We present the results of optical spectroscopic identifications of a bright subsample of 2-10 keV hard X-ray-selected sources from the ASCA Medium Sensitivity Survey in the northern sky (AMSSn). The…
Optical Identification of the ASCA Large Sky Survey
We present results of optical identification of the X-ray sources detected in the ASCA Large Sky Survey. Optical spectroscopic observations were done for 34 X-ray sources that were detected with the…
The BeppoSAX High-Energy Large-Area Survey. V. The Nature of the Hard X-Ray Source Population and Its Evolution
We present optical spectroscopic identifications of hard X-ray (5-10 keV) selected sources belonging to the High-Energy Large-Area Survey sample obtained with BeppoSAX down to a 5-10 keV flux limit…
SPICES II: Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx
We present our first results on field X-ray sources detected in a deep, 184.7 ks observation with the Advanced CCD Imaging Spectrometer (ACIS-I) on the Chandra X-Ray Observatory. The observations…
Discovery of a Type 2 Quasar at z = 0.9
We report the discovery of a narrow-line, X-ray-luminous galaxy at z = 0.9, which is the counterpart of an X-ray source detected in a deep pointing observation with the Advanced Satellite for…
A Candidate of a Type 2 Quasi-stellar Object at z = 0.9: Large X-Ray Absorption with a Strong Broad Hα Emission Line*
Deep hard X-ray and near-infrared observations of a type 2 radio-quiet quasi-stellar object (QSO) candidate at z = 0.9, AX J08494+4454, are reported. The 0.5-10 keV Chandra X-Ray Observatory spectrum…
A Chandra study of X-ray sources in the field of the z = 2.16 radio galaxy MRC 1138-262
We present results from a Chandra X-ray Observatory study of the field X-ray source population in the vicinity of the radio galaxy MRC 1138-262. Many serendipitous X-ray sources are detected in an…
The origin of the cosmic soft X-ray background: optical identification of an extremely deep ROSAT survey
We present the results of the deepest optically identified X-ray survey yet made. The X-ray survey was obtained with the ROSAT position-sensitive proportional counter (PSPC) and reaches a flux limit…
Superclustering of Faint Galaxies in the Field of a QSO Concentration at z ~ 1.1*
We report on a wide-area (48' × 9') imaging survey of faint galaxies in the R and I bands toward the 1338+27 field where an unusual concentration of five QSOs at z ~ 1.1, embedded in a larger scale…
Chandra Study of an Overdensity of X-Ray Sources around Two Distant (z ~ 0.5) Clusters
We present results from a Chandra X-Ray Observatory study of the field X-ray source populations in four different observations: two high-redshift (z ~ 0.5) clusters of galaxies 3C 295 and RX…
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