Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-04-27
Astronomy and Astrophysics
Astrophysics
8 pages (including figures) uuencoded compressed Postscript file. Submitted to Monthly Notices of the Royal Astronomical Socie
Scientific paper
We present {\it ASCA} observations of the Seyfert 1 galaxies Mrk~1040 and MS~0225.5+3121. Mrk~1040 was found to have decreased in flux by almost a factor of 4 since an {\it EXOSAT} observation 10\,years ago. The energy spectrum of Mrk~1040 displays complexity both at soft energies (below 0.8\thinspace keV) and at hard energies (6--7\thinspace keV). The latter is readily interpreted as fluorescent K$\alpha$ emission from cold iron expected when the primary X-ray source illuminates cold optically-thick material. This line is both broad (with FWHM 16\,000--70\,000 km\,s$^{-1}$) and strong (equivalent width $\sim 550\pm 250$\, eV) suggesting that it originates from material close to the compact object with non-solar abundances. Abundance effects on the equivalent width of such a line are investigated via Monte Carlo simulations. We find that strong lines can be produced with physically plausible abundances. The effect of abundances on the associated reflection continuum is also discussed. The soft spectral complexity implies either a strong soft excess together with intrinsic absorption, or a complex absorber. Various models for the nature of such a complex absorber are discussed. MS~0225.5+3121 shows no evidence for any variability and has a spectrum that is well described by a power law with Galactic absorption.
Fabian Andrea C.
Inoue Hajime
Reynolds Chris S.
No associations
LandOfFree
ASCA observations of the Seyfert 1 galaxies Mrk1040 and MS0225.5+3121 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ASCA observations of the Seyfert 1 galaxies Mrk1040 and MS0225.5+3121, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ASCA observations of the Seyfert 1 galaxies Mrk1040 and MS0225.5+3121 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-458628