Astrophys. J., 691, 261-276 (2009/January-3)
Suzaku observations of local ultraluminous infrared galaxies.
TENG S.H., VEILLEUX S., ANABUKI N., DERMER C.D., GALLO L.C., NAKAGAWA T., REYNOLDS C.S., SANDERS D.B., TERASHIMA Y. and WILSON A.S.
Abstract (from CDS):
We report the results from our analysis of Suzaku X-ray Imaging Spectrometer (XIS) (0.5-10 keV) and Hard X-ray Detector (HXD)/PIN (15-40 keV) observations of five well-known local ultraluminous infrared galaxies: IRAS F05189-2524, IRAS F08572+3915, Mrk 273, PKS 1345+12, and Arp 220. The XIS observations of F05189-2524 and Mrk 273 reveal strong iron lines consistent with Fe Kα and changes in spectral shapes with respect to previous Chandra and XMM-Newton observations. Mrk 273 is also detected by the HXD/PIN at ∼ 1.8σ. For F05189-2524, modeling of the data from the different epochs suggests that the change in spectral shape is likely due to the central source switching off, leaving behind a residual reflection spectrum, or an increase in the absorbing column. An increase in the covering fraction of the absorber can describe the spectral variations seen in Mrk 273, although a reduction in the intrinsic active galactic nucleus (AGN) luminosity cannot be formally ruled out. The Suzaku spectra of Mrk 273 are well fitted by a ∼ 94% covering fraction model with a column density of ∼ 1024/cm2. The absorption-corrected log[L2–10keV/LIR] ratio is consistent with those found in PG Quasars. The 0.5-10 keV spectrum of PKS 1345+12 and Arp 220 seem unchanged from previous observations and their hard X-ray emission is not convincingly detected by the HXD/PIN. The large column density derived from CO observations and the large equivalent width of an ionized Fe line in Arp 220 can be reconciled by an ionized reflection model. F08572+3915 is undetected in both the XIS and HXD/PIN, but the analysis of unpublished Chandra data provides a new measurement at low energies.
galaxies: active - galaxies: individual (IRAS F05189-2524, IRAS F08572+3915, Mrk 273, PKS 1345+12, Arp 220) - galaxies: starburst - X-rays: galaxies
erratum vol. 701, p. 2035 (2009)
SDSS J1342512.06+554759.6 is a misprint for SDSS J134512.06+554759.6.
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