The XMM-Newton Wide-Field Survey in the COSMOS Field. IV. X-Ray Spectral Properties of Active Galactic Nuclei Newer:Magellan Spectroscopy of AGN Candidates in the COSMOS FieldOlder:The XMM-Newton Wide-Field Survey in the COSMOS Field. III. Optical Identification and Multiwavelength Properties of a Large Sample of X-Ray-Selected Sources PostedJuly 1, 2013 AuthorScienceSites Categories2007