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Density Profiles In Seyfert Outflows by Behar, Ehud is a Physics and Astronomy article available to read on EtoBox.

What is Density Profiles In Seyfert Outflows about?

For the past decade, ionized outflows of a few 100 km s -1 from nearby Seyfert galaxies have been studied in great detail using high-resolution X-ray absorption spectra. A recurring feature of these outflows is their broad ionization distribution including essentially ions (e.g., of Fe) from neutral to fully ionized. The absorption measure distribution (AMD) is defined as the distribution of column density with ionization parameter |dN H /d(log ξ )|. AMDs of Seyfert outflows can span up to 5 orders of magnitude in ξ . We present the AMD of five outflows and show that they are all rather flat, perhaps slightly rising toward high ionization. More quantitatively, a powerlaw fit for log AMD ∝ (log ξ ) a yields slopes of 0 < a < 0.4. These slopes tightly constrain the density profiles of the wind, which until now could be addressed only by theory. If the wind is distributed on large scales, the measured slopes imply a generic density radial profile of n ∝ r -α with 1 < α < 1.3. This scaling rules out a mass conserving radial flow of n ∝ r -2 , or a constant density absorber, but is consistent with a nonspherical MHD outflow model in which n ∝ r -1 along any given line of sight. On the o

Who reads Density Profiles In Seyfert Outflows?

Author

Behar, Ehud

Publisher

University of Chicago Press; American Astronomical Society; Institute of Physics Publishing; IOP Publishing; Oxford University Press (OUP) (ISSN 0004-637X)

Published

2009

Language

FY

Field

Physics and Astronomy (Physical Sciences)