The Einstein Observatory Extended Medium-Sensitivity Survey. II - The optical identifications

Details The Einstein Observatory Extended Medium-Sensitivity Survey. II - The optical identifications The Einstein Observatory Extended Medium-Sensitivity Survey. II - The optical identifications

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..813s&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, July 1991, p. 813-874. Research supported by Smithsonian Inst

Astronomy and Astrophysics

Astrophysics

694

Heao 2, Optical Emission Spectroscopy, Visual Observation, X Ray Sources, Active Galactic Nuclei, Bl Lacertae Objects, Cooling Flows (Astrophysics), Galactic Clusters, Quasars, Radio Sources (Astronomy), X Ray Stars

Scientific paper

The optical identifications are presented of the Einstein Extended Medium-Sensitivity Survey (EMSS), including the methodology used to optically identify the EMSS sources and the uncertainties involved with that process. The optical properties of the classes of X-ray, optical, and radio data for each of the identified and, as yet, unidentified sources of the survey are described. A new class of X-ray emitters, cooling flow galaxies, is proposed. The criteria used to determine whether the proposed optical counterpart to the X-ray source is a plausible identification are described. Plausibility is based on the optical classification of the counterpart, e.g., AGN, cluster, G star, and the X-ray-to-optical flux ratios previously observed for these classes of X-ray emitters. Two independent schemes of optical classification of the counterparts are used to check the plausibility of these identifications; one is based on moderate-resolution optical spectroscopy, and the other, on inferred X-ray luminosity and the overall energy distribution.

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