Computer Science
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993csc..rept.....w&link_type=abstract
Final Report Computer Sciences Corp., Calverton, MD. System Sciences Div.
Computer Science
Emission Spectra, Gas Composition, Seyfert Galaxies, Stellar Spectra, Ultraviolet Radiation, Ultraviolet Spectra, Ultraviolet Spectroscopy, Halos, Hubble Space Telescope, Intergalactic Media, Line Spectra, Photoionization
Scientific paper
Ultraviolet spectra of bright Seyfert 1 galaxies will be obtained with the Hubble Space Telescope. Observations will be used to pursue the following goals: (1) Broad and narrow components of the strong emission lines will be deconvolved. (2) Broad-line profiles will be extracted for comparison with kinematic models; line ratios will be determined. (3) Many weak UV and emission lines from optical spectra will be compared for reddening along line of sight and chemical composition. (4) Absorption lines from Galactic halo, intergalactic medium and Seyfert galaxy will be used to establish physical conditions/chemical composition of the gas. (5) Strong emission Fe II in the UV will be used to determine FE II/L-alpha ratios for comparison with photoionization models. Other tasks relating to GTO 1170 program will be performed. It appears that NLR clouds in NGC 5548 experience much higher level of ionizing flux than those Seyfert 2 galaxies. Future observations will determine if this result extends to other Seyfert 1 galaxies.
Crenshaw Michael
Wu Congjun
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