The Narrow and Variable Emission Lines in NGC 4151

Details The Narrow and Variable Emission Lines in NGC 4151 The Narrow and Variable Emission Lines in NGC 4151

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2498u&link_type=abstract

HST Proposal ID #2498

Computer Science

Hst Proposal Id #2498

Scientific paper

Two narrow emission lines at 1518A and 1594A respectively (hereafter called L1 and L2) with intensities varying on time scales of day(s) have been found in the UV spectrum of NGC 4151. These lines are too narrow to be emitted by the entire broad line region. Therefore, regardless of their identifications, they must come from localized regions with a special excitation mechanism, possibly a two-sided jet. We propose to observe the structure of L1 and L2 with a resolution of 15-30 km/s and to study its variations on a time scale of 2 days by taking ~ 1 hour spectra each of L1 and L2 with GHRS G160M and to repeat these 2 spectra 2 days later. We propose to complement these high resolution spectra with a shorter exposure using FOS/BL (G130H) to measure the continuum and the entire profile of the CIV line. Similar low resolution spectra taken 2 and 4 days before and after the high resolution observations will provide information on the time delay between the intensity variations of L1 and L2.

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