期刊
ASTROPHYSICAL JOURNAL
卷 758, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/758/2/90
关键词
accretion, accretion disks; galaxies: active; galaxies: individual (4C+29.30); X-rays: galaxies
资金
- Polish MNiSW [N203-380336, 3812/B/H03/2009/36]
- NASA DPR [S-15633-Y]
- NASA [NAS8-39073]
- Chandra grants [GO0-11133X, GO1-12145X]
- XMM-Newton grant [NNX08AX35G]
We present results from a study of nuclear emission from a nearby radio galaxy, 4C+29.30, over a broad 0.5-200 keV X-ray band. This study used new XMM-Newton (similar to 17 ks) and Chandra (similar to 300 ks) data, and archival Swift/BAT data from the 58 month catalog. The hard (>2 keV) X-ray spectrum of 4C+29.30 can be decomposed into an intrinsic hard power law (Gamma similar to 1.56) modified by a cold absorber with an intrinsic column density N-H,N- z similar to 5 x 10(23) cm(-2), and its reflection (vertical bar Omega/2 pi vertical bar similar to 0.3) from a neutral matter including a narrow iron K alpha emission line at a rest-frame energy similar to 6.4 keV. The reflected component is less absorbed than the intrinsic one with an upper limit on the absorbing column of N-H, z(refl) < 2.5 x 10(22) cm(-2). The X-ray spectrum varied between the XMM-Newton and Chandra observations. We show that a scenario invoking variations of the normalization of the power law is favored over a model with variable intrinsic column density. X-rays in the 0.5-2 keV band are dominated by diffuse emission modeled with a thermal bremsstrahlung component with temperature similar to 0.7 keV, and contain only a marginal contribution from the scattered power-law component. We hypothesize that 4C+29.30 belongs to a class of hidden active galactic nuclei containing a geometrically thick torus. However, unlike the majority of hidden AGNs, 4C+29.30 is radio-loud. Correlations between the scattering fraction and Eddington luminosity ratio, and between black hole mass and stellar velocity dispersion, imply that 4C+29.30 hosts a black hole with similar to 10(8) M-circle dot mass.
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