G. Palumbo - Academia.edu (original) (raw)
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Universidade Federal do Rio Grande do Norte
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Papers by G. Palumbo
Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a num... more Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a number of radio-quiet AGNs and QSOs. These may be fundamental to probe flow dynamics near supermassive black holes.
Aims: Here we aim to verify and better characterise the existence of such Fe K absorption at ~8-10 keV in the luminous Seyfert 1 galaxy Mrk 509, one of the most promising target for these studies.
Methods: We present a comprehensive spectral analysis of the six XMM-Newton observations of the source (for a total of ~200 ks), focusing on a detailed and systematic search for absorption features in the high-energy data.
Results: We detect several absorption features at rest-frame energies ~8-8.5 keV and ~9.7 keV. The lines are consistent with being produced by H-like iron Kα and Kβ shell absorptions associated with an outflow with a mildly relativistic velocity of ~0.14-0.2 c. The lines are found to be variable in energy and, marginally, in intensity, implying variations in either the column density, geometry and/or ionization structure of the outflow are common.
There is increasing evidence that quasar outflows may play a key role in providing the feedback b... more There is increasing evidence that quasar outflows may play a key role in providing the feedback between AGN/QSOs and their surrounding (and feeding) media, in regulating the central supermassive black hole growth and the galaxy formation and, on larger scales, in shaping the growth of cosmic structures (see e.g. Elvis 2006). X-ray observations of quasar outflows are crucial to probe their innermost parts and assess the global energetics entrained in the outflow by studying its most extreme (in terms of velocity, ionization state, mass outflow rate) phases. Simbol-X-with its high effective area in the Fe K energy band and above-will allow the detection and the characterization of powerful outflows in bright, nearby AGN and notably also in moderately faint AGN, thus shedding light on feedback processes in these objects.
Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a num... more Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a number of radio-quiet AGNs and QSOs. These may be fundamental to probe flow dynamics near supermassive black holes.
Aims: Here we aim to verify and better characterise the existence of such Fe K absorption at ~8-10 keV in the luminous Seyfert 1 galaxy Mrk 509, one of the most promising target for these studies.
Methods: We present a comprehensive spectral analysis of the six XMM-Newton observations of the source (for a total of ~200 ks), focusing on a detailed and systematic search for absorption features in the high-energy data.
Results: We detect several absorption features at rest-frame energies ~8-8.5 keV and ~9.7 keV. The lines are consistent with being produced by H-like iron Kα and Kβ shell absorptions associated with an outflow with a mildly relativistic velocity of ~0.14-0.2 c. The lines are found to be variable in energy and, marginally, in intensity, implying variations in either the column density, geometry and/or ionization structure of the outflow are common.
There is increasing evidence that quasar outflows may play a key role in providing the feedback b... more There is increasing evidence that quasar outflows may play a key role in providing the feedback between AGN/QSOs and their surrounding (and feeding) media, in regulating the central supermassive black hole growth and the galaxy formation and, on larger scales, in shaping the growth of cosmic structures (see e.g. Elvis 2006). X-ray observations of quasar outflows are crucial to probe their innermost parts and assess the global energetics entrained in the outflow by studying its most extreme (in terms of velocity, ionization state, mass outflow rate) phases. Simbol-X-with its high effective area in the Fe K energy band and above-will allow the detection and the characterization of powerful outflows in bright, nearby AGN and notably also in moderately faint AGN, thus shedding light on feedback processes in these objects.