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Title: A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS

Abstract

We have analyzed a long-look Suzaku observation of the Seyfert 1.2 Mkn 590. We aimed to measure the Compton reflection strength, Fe K complex properties, and soft excess emission as had been observed previously in this source. The Compton reflection strength was measured to be in the range 0.2-1.0 depending on the model used. A moderately strong Fe K{alpha} emission line was detected with an equivalent width of {approx}120 {+-} 25 eV and an Fe K{beta} line was identified with an equivalent width of {approx}30 {+-} 20 eV, although we could not rule out contribution from ionized Fe emission at this energy. Surprisingly, we found no evidence for soft excess emission. Comparing our results with a 2004 observation from XMM-Newton we found that either the soft excess has decreased by a factor of 20-30 in 7 years or the photon index has steepened by 0.10 (with no soft excess present) while the continuum flux in the range 2-10 keV has varied only minimally (10%). This result could support recent claims that the soft excess is independent of the X-ray continuum.

Authors:
; ;  [1];  [2]
  1. Center for Astrophysics and Space Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0424 (United States)
  2. Dr. Karl Remeis-Sternwarte and Erlangen Centre for Astroparticle Physics, Frederic-Alexander Universitaet Erlangen-Nuernberg, 7 Sternwartstrasse, D-96049 Bamberg (Germany)
Publication Date:
OSTI Identifier:
22086442
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; COMPTON EFFECT; COSMIC PHOTONS; EV RANGE; GAMMA ASTRONOMY; ION EMISSION; IRON IONS; KEV RANGE; REFLECTION; SEYFERT GALAXIES; X-RAY GALAXIES

Citation Formats

Rivers, Elizabeth, Markowitz, Alex, Rothschild, Richard, and Duro, Refiz. A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/63.
Rivers, Elizabeth, Markowitz, Alex, Rothschild, Richard, & Duro, Refiz. A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS. United States. doi:10.1088/0004-637X/759/1/63.
Rivers, Elizabeth, Markowitz, Alex, Rothschild, Richard, and Duro, Refiz. Thu . "A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS". United States. doi:10.1088/0004-637X/759/1/63.
@article{osti_22086442,
title = {A SUZAKU OBSERVATION OF Mkn 590 REVEALS A VANISHING SOFT EXCESS},
author = {Rivers, Elizabeth and Markowitz, Alex and Rothschild, Richard and Duro, Refiz},
abstractNote = {We have analyzed a long-look Suzaku observation of the Seyfert 1.2 Mkn 590. We aimed to measure the Compton reflection strength, Fe K complex properties, and soft excess emission as had been observed previously in this source. The Compton reflection strength was measured to be in the range 0.2-1.0 depending on the model used. A moderately strong Fe K{alpha} emission line was detected with an equivalent width of {approx}120 {+-} 25 eV and an Fe K{beta} line was identified with an equivalent width of {approx}30 {+-} 20 eV, although we could not rule out contribution from ionized Fe emission at this energy. Surprisingly, we found no evidence for soft excess emission. Comparing our results with a 2004 observation from XMM-Newton we found that either the soft excess has decreased by a factor of 20-30 in 7 years or the photon index has steepened by 0.10 (with no soft excess present) while the continuum flux in the range 2-10 keV has varied only minimally (10%). This result could support recent claims that the soft excess is independent of the X-ray continuum.},
doi = {10.1088/0004-637X/759/1/63},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}