Chandra observations of the H2O megamaser galaxy Mrk1210 |
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Authors: | JiangShui Zhang and JunHui Fan |
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Institution: | (1) Center for Astrophysics, Guangzhou University, Guangzhou, 510006, China |
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Abstract: | We present the first Chandra X-ray observations of the H2O megamaser galaxy Mrk1210 (UGC4203), a Seyfert 2 galaxy at an approximate distance of D ∼ 57.6 Mpc. The Chandra X-ray image, with by far the highest angular resolution (∼1″), displays an unresolved compact core toward the nuclear region
of Mrk1210. Comparisons with the previous X-ray observations in the nuclear emission and the spectral shape indicate a fairly
stable phase between 2001 (BeppoSAX and XMM-Newton) and 2004 (Chandra) after a dramatic variation since 1995 (ASCA). The best-fit model of Chandra X-ray spectrum consists of two components. The soft scattered component can be best fitted by a moderately absorbed power-law
model adding a spectral line at ∼0.9 keV (possibly a Ne-Kα fluorescent line), while the hard nuclear component can be well
reproduced by a heavily absorbed power-law model (N
H ∼ 2×1023 cm−2) with an additional line at ∼6.19 keV (close to the Fe-Kα fluorescent line). The derived absorption-corrected X-ray luminosity
implies that the dramatic variation of spectral properties is caused by significant changes of the absorbing column density
along the line-of-sight, while the intrinsic nuclear X-ray luminosity remains stable. In this case, the absorbers should be
anisotropic and its size can be constrained to be less than 0.0013 pc. In addition, we also estimate the mass of central engine,
the disk radius and the accretion rate of the accretion disk to be 107.12±0.31
M
⊙, ∼1 pc and 0.006, respectively.
Supported by the National Natural Science Foundation of China (Grant No. 10633010) and the Natural Science Foundation of Guangdong
Province, China (Grant No. 8451009101001047)
Recommended by Zhou YouYuan |
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Keywords: | active galaxy nuclei Seyfert galaxy X-ray maser |
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