HETG Observations of Extreme Narrow-Line Seyfert 1 Galaxies

Details HETG Observations of Extreme Narrow-Line Seyfert 1 Galaxies HETG Observations of Extreme Narrow-Line Seyfert 1 Galaxies

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..134l&link_type=abstract

Chandra Proposal ID #01700702

Physics

Chandra Proposal Id #01700702

Scientific paper

We have recently discovered absorption features near 1 keV in the ASCA spectra of three Narrow-line Seyfert 1 galaxies (NLS1s). Plausible explanations for this feature are oxygen continuum or resonance line absorption by relativistically outflowing gas, but absorption by material overabundant in iron cannot be ruled out. We propose 100 ks HETG observations of the brighter two of these objects, 1H 0707-495 and IRAS 13224-3809, to determine the origin of this feature. These objects also show the steepest spectra and highest amplitude variability of the NLS1s observed by ASCA, and therefore identification of this feature could be an important clue for understanding these enigmatic objects. Analysis and interpretation will be enhanced by our upcoming HST STIS observations of these

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