Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8321b&link_type=abstract
HST Proposal ID #8321
Physics
Hst Proposal Id #8321 Agn Physics
Scientific paper
X-ray studies of the nearby Seyfert 1 galaxy NGC 4051 reveal strong and complex absorption by ionized nuclear gas {a `warm absorber'}. This gas is a major component of the nuclear environment, and we will soon use AXAF to make the first grating-resolution study of the X-ray warm absorber in NGC 4051. Here we propose simultaneous or near-simultaneous STIS UV spectroscopy. Many Seyferts/quasars with X-ray warm absorbers also show UV absorption lines {e.g. LyAlpha, N v and C iv}, and it has been argued that the X-ray and UV absorption arise in the same gas. NGC 4051 shows evidence for C iv absorption in IUE spectra, and combined STIS/ AXAF spectra will allow us to critically test the unified UV/X-ray absorber model by comparing the velocity fields and strengths of the UV/X-ray absorption. We will also derive superior constraints upon the internal velocity structure, location, global covering factor, and line-of-sight covering factor of the ionized gas. NGC 4051 is a pa rticularly interesting target because, as a soft X-ray `Narrow-Line Seyfert 1' galaxy, its ionizing continuum is substantially softer than that of more `typical' Seyfert 1s {e.g. NGC 3516 and NGC 3783}. This may lead to significantly different absorption characteristics. This observation will be the first HST UV spectroscopy of NGC 4051, and simultaneous observations are important because the absorption is likely to be variable.
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