An extended XMM-Newton observation of the Seyfert galaxy NGC 4051-II. Soft X-ray emission from a limb-brightened shell of post-shock gas

作者：Pounds K A^*; Vaughan S

来源：Monthly Notices of the Royal Astronomical Society, 2011, 415(3): 2379-2387.

DOI：10.1111/j.1365-2966.2011.18866.x

• galaxies: active
• galaxies: general
• galaxies: individual: NGC 4051
• galaxies: Seyfert
• X-rays: galaxies

An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 revealed a complex absorption spectrum, with a wide range of outflow velocities and ionization states. The main velocity and ionization structure was interpreted in Paper I in terms of a decelerating, recombining flow resulting from the shocking of a still higher velocity wind colliding with the interstellar medium or slower moving ejecta. The high sensitivity of the XMM-Newton observation also revealed a number of broad emission lines, all showing evidence of self-absorption near the line cores. The line profiles are found here to be consistent with emission from a limb-brightened shell of post-shock gas building up ahead of the contact discontinuity. While the broad emission lines remain quasi-constant as the continuum flux changes by an order of magnitude, recombination continua of several H-and He-like ions are found to vary in response to the continuum, providing an important key to scaling the ionized flow.

• 出版日期2011-8