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Coordinated time variability of multi-phase ultra-fast outflows in J132216.25 + 052446.3

Abstract : We present a time variability analysis of broad absorption lines (BAL; spread over the velocity range of 5800-29 000 km s-1) seen in the spectrum of J132216.25 + 052446.3 (zem = 2.04806) at ten different epochs spanning over 19 yr. The strongest absorption component (BAL-A; spread over 5800-9900 km s-1) is made up of several narrow components having velocity separations close to C IV doublet splitting. The C IV, N V, and Si IV absorption from BAL-A show correlated optical depth variability without major changes in the velocity structure. A very broad and shallow absorption (BAL-C; spread over the velocity range 15 000-29 000 km s-1) emerged during our monitoring period coinciding with a dimming episode of J1322 + 0524. All the identified absorption lines show correlated variability with the equivalent widths increasing with decreasing flux. This together with the C IV emission line variability is consistent with ionization being the main driver of the correlated variability. The observed UV-continuum variations are weaker than what is required by the photoionization models. This together with a scatter in the C IV equivalent width at a given continuum flux can be understood if variations of the C IV ionizing photons are much larger than that of the UV continuum, the variations in the ionizing photon and UV fluxes are not correlated and/or the covering factor of the flow varies continuously. We suggest BAL-A is produced by a stable clumpy outflow located beyond the broad emission line region and BAL-C is a newly formed wind component located near the accretion disc and both respond to changes in the ionizing continuum.
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https://hal-insu.archives-ouvertes.fr/insu-03748233
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Submitted on : Tuesday, August 9, 2022 - 12:15:10 PM
Last modification on : Tuesday, September 20, 2022 - 3:10:10 PM

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P. Aromal, R. Srianand, P. Petitjean. Coordinated time variability of multi-phase ultra-fast outflows in J132216.25 + 052446.3. Monthly Notices of the Royal Astronomical Society, 2022, 514, pp.1975-1989. ⟨10.1093/mnras/stac1460⟩. ⟨insu-03748233⟩

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