Does the Inner Broad-Line Region DIM Down When the Power Turns Up?
Abstract
The temporal correlations of continuum and broad emission-line fluxes from the Seyfert galaxy NGC 5548 as measured during the 1989 monitoring campaign show two related peculiarities: first, some of the cross- correlations of line and continuum flux appear steeper on the negative time lag side than the continuum autocorrelation itself; then, the autocorrelation of the line flux is sometimes more sharply peaked than the continuum autocorrelation function. These are here interpreted as evidence that conditions in the inner part of the broad-line region are such that some emission lines decrease in intensity as the continuum strengthens.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1993
- DOI:
- 10.1086/172309
- Bibcode:
- 1993ApJ...404..570S
- Keywords:
-
- Astronomical Photometry;
- Emission Spectra;
- Galactic Radiation;
- Line Spectra;
- Seyfert Galaxies;
- Autocorrelation;
- Cross Correlation;
- Time Lag;
- Ultraviolet Photometry;
- Astrophysics;
- GALAXIES: INDIVIDUAL NGC NUMBER: NGC 5548;
- GALAXIES: PHOTOMETRY;
- GALAXIES: SEYFERT