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

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

1999-05-26

arxiv.org/abs/astro-ph/9905342v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1999.02874.x

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.

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