X-ray Selected Narrow Line Seyfert 1s In The SDSS-DR5

Details X-ray Selected Narrow Line Seyfert 1s In The SDSS-DR5 X-ray Selected Narrow Line Seyfert 1s In The SDSS-DR5

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0224g&link_type=abstract

American Astronomical Society Meeting 210, #02.24; Bulletin of the American Astronomical Society, Vol. 39, p.96

Astronomy and Astrophysics

Astronomy

Scientific paper

We have defined a sample of 80 Narrow Line Seyfert 1 (NLS1) through a cross-correlation of the preliminary second XMM-Newton serendipitous source catalogue (2XMMp) and spectral targets in the Sloan Digital Sky Survey Data Release 5 (SDSS DR5). Nearly half (38) have extremely narrow Balmer lines with widths < 1000km/s. The X-ray selection coupled with the fact that nearly all sources have broader Hβ than [O III] lines makes it likely that even the narrowest of these sources, those with v 300km/s, are true NLS1. We are presently compiling broadband spectral energy distributions (SEDs) using data from XMM, Galex, SDSS, 2MASS, IRAS, NVSS and FIRST to quantify differences between these sources and conventional broad line Seyfert 1s (Sy1). Such SEDs typically exhibit two broad peaks, in the infrared and optical/ultraviolet bands, with an intervening minimum around 1µm. In a pilot study comparing three NLS1 with three Sy1 we find that the flux ratio of the IR and opt/UV bumps is lower in the NLS1, and that the NLS1 are much weaker in the hard (15-50keV) X-ray band. We are also in the process of obtaining higher resolution optical and near IR spectra to measure the high ionization emission lines, those with ionisation potentials up to 300eV, which can be used as a tracer of the unobservable EUV continuum. In five of our six pilot study targets the implied EUV spectrum is consistent with an extrapolation of the soft X-ray continuum to lower energies.

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