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  Multi-wavelength campaign on NGC 7469 - V. Analysis of the HST/COS observations: Super solar metallicity, distance, and trough variation models

Arav, N., Xu, X., Kriss, G. A., Chamberlain, C., Miller, T., Behar, E., et al. (2020). Multi-wavelength campaign on NGC 7469 - V. Analysis of the HST/COS observations: Super solar metallicity, distance, and trough variation models. Astronomy and Astrophysics, 633: A61. doi:10.1051/0004-6361/201935342.

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Multi-wavelength campaign on NGC 7469 - V. Analysis of the HST COS observations Super solar metallicity, distance, and trough variation models.pdf (Any fulltext), 896KB
 
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Arav, N., Author
Xu, X., Author
Kriss, G. A., Author
Chamberlain, C., Author
Miller, T., Author
Behar, E., Author
Kaastra, J. S., Author
Ely, J. C., Author
Peretz, U., Author
Mehdipour, M., Author
Branduardi-Raymont, G., Author
Bianchi, S., Author
Cappi, M., Author
Costantini, E., Author
Marco, B. De, Author
Gesu, L. di, Author
Ebrero, J., Author
Kaspi, S., Author
Middei, R., Author
Petrucci, P.-O., Author
Ponti, G.1, Author               more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Context. AGN outflows are thought to influence the evolution of their host galaxies and their super massive black holes. To better understand these outflows, we executed a deep multiwavelength campaign on NGC 7469. The resulting data, combined with those of earlier epochs, allowed us to construct a comprehensive physical, spatial, and temporal picture for this AGN wind. Aims. Our aim is to determine the distance of the UV outflow components from the central source, their abundances and total column-density, and the mechanism responsible for their observed absorption variability. Methods. We studied the UV spectra acquired during the campaign as well as from three previous epochs (2002–2010). Our main analysis tools are ionic column-density extraction techniques and photoionization models (both equilibrium and time-dependent models) based on the code CLOUDY. Results. For component 1 (at –600 km s−1) our findings include the following: metallicity that is roughly twice solar; a simple model based on a fixed total column-density absorber, reacting to changes in ionizing illumination that matches the different ionic column densities derived from four spectroscopic epochs spanning 13 years; and a distance of R = 6+2.5−1.5 pc from the central source. Component 2 (at –1430 km s−1) has shallow troughs and is at a much larger R. For component 3 (at –1880 km s−1) our findings include: a similar metallicity to component 1; a photoionization-based model can explain the major features of its complicated absorption trough variability and an upper limit of 60 or 150 pc on R. This upper limit is consistent and complementary to the X-ray derived lower limit of 12 or 31 pc for R. The total column density of the UV phase is roughly 1% and 0.1% of the lower and upper ionization components of the warm absorber, respectively. Conclusions. The NGC 7469 outflow shows super-solar metallicity similar to the outflow in Mrk 279, carbon and nitrogen are twice and four times more abundant than their solar values, respectively. Similar to the NGC 5548 case, a simple model can explain the physical characteristics and the variability observed in the outflow.

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 Dates: 2020-01-10
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201935342
Other: LOCALID: 3213583
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 633 Sequence Number: A61 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1