PHL 1811: The Local Prototype of the Lineless High-z SDSS QSOs

Details PHL 1811: The Local Prototype of the Lineless High-z SDSS QSOs PHL 1811: The Local Prototype of the Lineless High-z SDSS QSOs

2004-02-23

arxiv.org/abs/astro-ph/0402535v1

Astronomy and Astrophysics

Astrophysics

Proc. AGN Physics with the Sloan Digital Sky Survey, Eds. G. T. Richards and P. B. Hall, 4 pages, 2 figures

Scientific paper

Abridged) In the SDSS, several unusual QSOs have been discovered that have very blue rest-frame UV spectra but no discernible emission lines. Their UV spectra strongly resemble that of the newly discovered quasar PHL 1811 ($z=0.192$; $\rm M_{V}=-25.9$). With magnitudes of $B = 14.4$ and $R = 14.1$, PHL 1811 is the second brightest quasar known with $z>0.1$ after 3C 273. Optically it is classified as a Narrow-line Seyfert 1 galaxy (NLS1). Objects of this class are generally strong soft X-ray emitters, but a BeppoSAX observation of PHL 1811 showed that it is anomalously X-ray weak. The inferred $\alpha_{ox}$ was 1.9--2.1, much steeper than the nominal value of 1.6 for quasars of this optical luminosity, and comparable to the X-ray weakest quasars. Follow-up {\it Chandra} observations reveal a variable, unabsorbed X-ray spectrum and confirm that it is intrinsically X-ray weak.

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