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GHRS Monitoring of the Outflowing Material in NGC 4151

1997; IOP Publishing; Volume: 483; Issue: 2 Linguagem: Inglês

10.1086/304275

1538-4357

R. J. Weymann, S. L. Morris, Meghan E. Gray, J. B. Hutchings,

Galaxies: Formation, Evolution, Phenomena

We present the results of a program to monitor the absorption lines in the spectrum of the Seyfert 1 galaxy NGC 4151 caused by outflowing gas from the nucleus. Spectral observations were taken in the UV with the GHRS and FOS of HST. GHRS G160M and G270M exposures were taken of the wavelength regions centered on C IV and Mg II, respectively, extending over a nearly 4 yr period. Fits to the observations at all epochs but one require at least eight distinct components spanning a range of outflow velocities from 0 to ~1600 km s-1 with respect to the nucleus. (NGC 4151 has a redshift of ~1000 km s-1).