UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

The X-ray spectrum of the Seyfert I galaxy Markarian 766: Dusty warm absorber or relativistic emission lines?

Mason, KO; Branduardi-Raymont, G; Ogle, PM; Page, MJ; Puchnarewicz, EM; Behar, E; Cordova, FA; ... Sasseen, TP; + view all (2003) The X-ray spectrum of the Seyfert I galaxy Markarian 766: Dusty warm absorber or relativistic emission lines? ASTROPHYS J , 582 (1) 95 - 104. Green open access

[thumbnail of 9734.pdf]
Preview
PDF
9734.pdf

Download (303kB)

Abstract

Competing models for broad spectral features in the soft X-ray spectrum of the Seyfert I galaxy Mrk 766 are tested against data from a 130 ks XMM-Newton observation. A model including relativistically broadened Lyalpha emission lines of O VIII N VII and C VI is a better fit to 0.3-2 keV XMM RGS data than a dusty warm absorber. Moreover, the measured depth of neutral iron absorption lines in the spectrum is inconsistent with the magnitude of the iron edge required to produce the continuum break at 17-18 Angstrom in the dusty warm absorber model. The relativistic emission line model can reproduce the broadband (0.1-12 keV) XMM EPIC data with the addition of a fourth line to represent emission from ionized iron at 6.7 keV and an excess due to reflection at energies above the iron line. The pro le of the 6.7 keV iron line is consistent with that measured for the low-energy lines. There is evidence in the RGS data, at the 3sigma level, of spectral features that vary with source flux. The covering fraction of warm absorber gas is estimated to be 12%. Iron in the warm absorber is found to be overabundant with respect to CNO, compared to solar values.

Type: Article
Title: The X-ray spectrum of the Seyfert I galaxy Markarian 766: Dusty warm absorber or relativistic emission lines?
Open access status: An open access version is available from UCL Discovery
Keywords: accretion, accretion disks, galaxies : individual (Markarian 766), galaxies : Seyfert, line : profiles, X-rays : galaxies, REFLECTION GRATING SPECTROMETER, ACTIVE GALACTIC NUCLEI, PHOTON IMAGING CAMERA, XMM-NEWTON, ATOMIC DATA, BLACK-HOLE, MCG-6-30-15, MULTIWAVELENGTH, ABSORPTION, STRENGTH
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/9734
Downloads since deposit
189Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item