paper

The warm absorber of the Seyfert 1 galaxy H1419+480

arXiv:astro-ph/0304210 · doi:10.1111/j.1365-2966.2003.07137.x

Abstract

The bright Seyfert 1 galaxy H1419+480 (z~0.072), whose X-ray colours from earlier HEAO-1 and ROSAT missions suggested a complex X-ray spectrum, has been observed with XMM-Newton. The EPIC spectrum above 2 keV is well fit by a power-law with photon index Γ=1.84\pm 0.01 and an Fe Ka line of equivalent width ~250 eV. At softer energies, a decrement with respect to this model extending from 0.5 to 1 keV is clearly detected. After trying a number of models, we find that the best fit corresponds to OVII absorption at the emission redshift, plus a 2-sigma detection of OVIII absorption. A photoionised gas model fit yields log xi~ 1.15-1.30 (xi in erg cm/s) with N_H~ 5 10^{21} cm^{-2} for solar abundances. We find that the ionized absorber was weaker or absent in an earlier ROSAT observation. An IUE spectrum of this source obtained two decades before shows a variable (within a year) CIV absorber outflowing with a velocity ~1800 km/s. We show that both X-ray and UV absorptions are consistent with arising in the same gas, with varying ionisation.

arXiv commentMajor changes prompted by the referee report. 9 pages, 11 figures, MNRAS, in the press

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