Letg Spectroscopy of the MKN 478: the Brightest Narrow-Line Seyfert 1 IN the Soft X-Ray Sky

Details Letg Spectroscopy of the MKN 478: the Brightest Narrow-Line Seyfert 1 IN the Soft X-Ray Sky Letg Spectroscopy of the MKN 478: the Brightest Narrow-Line Seyfert 1 IN the Soft X-Ray Sky

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..201e&link_type=abstract

Chandra Proposal ID #01700851

Computer Science

Chandra Proposal Id #01700851

Scientific paper

Narrow-line Seyfert 1s have strong, variable soft X-ray excesses and unusually narrow optical emission lines. With a very strong excess and low Galactic column, Mkn 478 is by far the brightest NLS1 at soft X-ray energies. We propose a 75~ksec LETG observation that should yield a spectrum with >30,000 photons, making efficient use of precious AO1 time to study an archetype of this type of AGN. The LETGS's excellent resolution and throughput will allow the first detailed spectral studies of the excess, resolving any blended lines and showing there is a strong soft thermal or nonthermal continuum. Also, the variability of different components could provide key constraints on their sizes.

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