Simultaneous HST, Chandra, and FUSE Spectroscopy of NGC 4151

Details Simultaneous HST, Chandra, and FUSE Spectroscopy of NGC 4151 Simultaneous HST, Chandra, and FUSE Spectroscopy of NGC 4151

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8608k&link_type=abstract

HST Proposal ID #8608

Computer Science

Hst Proposal Id #8608 Agn/Quasars

Scientific paper

Absorption by warm, ionized gas at UV and X-ray wavelengths is proving to be a common feature in Seyfert 1 galaxies, showing its presence in well over half the galaxies observed. In some cases, like NGC 4151 and NGC 3516, the absorption is seen over a wide range of ionization states, and it is optically thick at the Lyman limit, thick enough to potentially collimate the ionizing radiation in these objects and produce ``ionization cones" visible in emission-line images. Thus understanding this warm absorbing gas and its origin may help us to understand how radiation is collimated in AGN, and it may provide additional clues to the differences and similarities between Type 1 and Type 2 AGN. The proximity and brightness of NGC 4151 make it a key object for understanding the structure of AGN. We propose to obtain simultaneous spectroscopy of the absorbing gas in NGC 4151 using the STIS echelle modes on HST, FUSE, and Chandra. These observations will allow us to determine the ionization states of each of the 8 kinematic components present in the absorbing gas in NGC 4151, and to resolve the persistent discrepancies between the gas columns inferred for the UV and X-ray absorption over the past two decades. The simultaneity will avoid any ambiguity due to the known variability in the UV and X-ray absorption.

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