Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5428f&link_type=abstract
HST Proposal ID #5428
Computer Science
Hst Proposal Id #5428 Quasars &Amp, Agn Radio Galaxies
Scientific paper
Arp 102B is the prototype of a set of ten broad-line radio galaxies whose hydrogen Balmer line profiles are double-peaked, and which share several additional distinguishing optical characteristics. We recently established the reality of this class through a comprehensive optical spectroscopic survey of radio-loud AGNs at z < 0.4 (Eracleous & Halpern 1992, 1993). We now propose to obtain moderate-resolution spectra to study the UV emission lines and nonstellar continuum of Arp 102B. Several theories have been suggested to explain the unusual line profiles; the most detailed is a model for emission from the photoionized atmosphere of an accretion disk. The Balmer lines are the only broad lines detected in ground-based spectra, and the optical nucleus is dominated by starlight. Both of these limitations restrict further progress in understanding the nature of this peculiar spectrum. But observations of the UV emission lines and continuum could test the models by (1) measuring line profiles of species with different ionization potentials, and (2) measuring the nonstellar continuum, which seems different from that of most AGNs. Disk photoionization models predict line shapes which are different among the UV lines. The same model predicts an ionizing continuum which is nonthermal, arising in an optically thin, ion-supported torus, rather than a blackbody accretion disk. If supported by the results of HST spectra, our study of Arp 102B could provide the most direct view of an accretion disk in an AGN.
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