Study of UV line and continuum variabilities in the Broadline Seyfert 1 Galaxy ESO 141-G55

Abstract

We present the results from a 3-year-long Ultraviolet monitoring campaign of the broad line Seyfert 1 galaxy ESO 141-G55 using International Ultraviolet Explorer (IUE). By modelling all individual, extinction-corrected UV spectra in 1150-1978 A and 1850-3348 A wavelength range, we have observed a significant variability in both UV continuum and line fluxes. Variabilities due to ionised UV lines like SiIV, CIV and HeII are delayed with respect to the UV continuum by 2.92${}_{-0.61}^{+0.54}$, 4.41${}_{-0.54}^{+0.44}$, 4.11${}_{-0.81}^{+0.35}$ days, respectively. At a distance of $\sim$0.004c, an outer accretion disc can be a possible site for the origin of UV lines.

10 pages, 8 figures, 6 tables Accepted for publication in Astronomische Nachrichten