Are There Any Type 2 QSOs? The Case of AXJ0341.4-4453

Abstract

The X-ray source AXJ0341.4-4453 was described by Boyle et al. as a Type 2 AGN at z = 0.672 based on the absence of broad emission lines in the observed wavelength range 4000-7000 Angstroms. We obtained a new spectrum of AXJ0341.4-4453 extending to 9600 Angstroms which reveals broad Balmer lines and other characteristics of Seyfert 1 galaxies. The FWHM of broad H-beta is at least 1600 km/s, while [O III]5007 has FWHM = 730 km/s. The flux ratio [O III]5007/H-beta = 1. Thus, AXJ0341.4-4453 is by definition a narrow-line Seyfert 1 galaxy, or perhaps a moderately reddened Seyfert 1 galaxy, but it is not a Type 2 QSO. Although examples of the latter have long been sought, particularly in connection with the problem of the X-ray background, there is still virtually no evidence for the existence of any Type 2 QSO among X-ray selected samples.

4 pages, 3 figures, to appear in MNRAS

References in corpus (1)

• The contribution of faint AGN to the hard X-ray background

Cited by in corpus (32)

• Dust in active nuclei. I. Evidence for "anomalous" properties
• XMM-Newton observation of the Lockman Hole; I. The X-ray Data
• Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
• The luminosity dependence of the Type 1 AGN fraction
• A Classic Type 2 QSO
• The Chandra Deep Field North Survey. VI. The Nature of the Optically Faint X-ray Source Population
• Testing current synthesis models of the X-ray background
• Chandra Detection of a TypeII Quasar at z=3.288
• Testing the connection between the X-ray and submillimetre source populations using Chandra
• Narrow-Line Seyfert 1s: 15 Years Later
• A Large, Uniform Sample of X-ray Emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample
• A Large, Uniform Sample of X-ray Emitting AGN: Selection Approach and an Initial Catalog from the ROSAT All-Sky and Sloan Digital Sky Surveys
• The Spatial Clustering of ROSAT All-Sky Survey AGNs III. Expanded Sample and Comparison with Optical AGNs
• The Serendipitous Extragalactic X-Ray Source Identification (SEXSI) Program. III. Optical Spectroscopy
• The 9.7 Micron Silicate Dust Absorption Toward the Cygnus A Nucleus and the Inferred Location of the Obscuring Dust
• Exploring the spectral properties of faint hard X-ray sources with XMM-Newton
• A Search for Optical Variability of Type 2 Quasars in SDSS Stripe 82
• Unobscured QSO2: A New Class of Objects?
• Evidence for X-ray Obscuration in Type II Quasar Candidates from the Sloan Digital Sky Survey
• Heavy absorption and soft X-ray emission lines in the XMM-Newton spectrum of the Type 2 radio-loud quasar 3C 234
• A Hard Medium Survey with ASCA. IV: the Radio-Loud Type 2 QSO AXJ0843+294 2
• A candidate of a type-2 QSO at z=0.9: Large X-ray absorption with a strong broad-H-alpha emission line
• X-ray spectroscopy of the Compton-thick Seyfert 2 ESO 138-G1
• Cosmic star formation history associated with QSO activity: an approach using the black hole to bulge mass correlation
• ROSAT Blank Field Sources I: Sample Selection and Archival Data
• VLT near-infrared spectra of hard serendipitous Chandra sources
• Thermal Infrared 3--5 $\mu$m Colors of Obscured and Unobscured Active Galactic Nuclei
• High-redshift Narrow-line Seyfert 1 Galaxies: A Candidate Sample
• On the fraction of X-ray obscured quasars in the local universe
• ASCA observations of deep ROSAT fields V. The X-ray spectrum of hard X-ray selected QSOs
• VLT-FORS2 optical imaging and spectroscopy of 9 luminous type 2 AGN at 0.3<z<0.6: I. Ionized gas nebulae
• XMM-Newton observations of an absorbed z=0.67 QSO: no dusty torus?