Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1855m&link_type=abstract
IUE Proposal ID #QSGMM
Computer Science
Scientific paper
Last year we began to collect simultaneous (within a week) ultraviolet, optical, and infrared spectrophotometry of bright variable Seyfert 1 galaxies. Hardly any simultaneous multiwavelength observations had been made in IUE's first five years. Our data will, for the first time, permit the study of variability of individual continuum components. For example, we will measure the variations in the nonthermal power-law, and the Balmer line and continuum emission, and their relation to the optically thick thermal component which produces most of the ultraviolet excess (Malkan and Sargent 1982). If the ultraviolet emission comes from an accretion disk (Malkan 1983), its variability gives critical information about viscosity and the vertical structure of the disk. We will also compare the simultaneous ultraviolet and optical emission-line strengths and profiles. We have measured the reddening and starlight contamination in all of our program objects, and they are small effects. This variability study requires at least three or four sets of observations, and we can complete the program this year.
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