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RXJ 1301.9+2747 is an optically identified very low mass AGN candidate withM_BH~1x10^6M_sun, which shows extremely soft X-ray emission and unusual X-rayvariability in the form of short-lived flares. We present an analysis ofmultiwavelength observations of RXJ 1301.9+2747 in order to study theproperties of the active nucleus and its host galaxy. The UV-to-X-ray spectrumin the quiescent state can be well and self-consistently described by a thermaland a Comptonized emission from accretion disk, with blackbody dominating ~70%of the X-rays in the 0.2-2 keV. The same model can describe the X-ray spectrumin the flare state but the Comptonized component becomes dominant (~80%). Thebest-fit implies an Eddington ratio of ~0.14, and a black hole mass of1.7-2.8x10^6M_sun, in agreement with the estimation from the optical datawithin errors. However, the best-fitting model under-predicts the optical fluxfor the HST point source by a factor of ~2. The excess of nuclear opticalemission could be attributed to a nuclear stellar cluster which is frequentlyseen in low mass AGNs. The X-ray to optical spectral slope (alpha_ox) is lowerthan in most other active galaxies, which may be attributed to intrinsicallyX-ray weakness due to very little hot and optically thin coronal emission. Weperformed a pilot search for weak or hidden broad emission lines using opticalspectropolarimetry observations, but no any polarized broad lines are detected.The host galaxy appears to be a disk galaxy with a boxy pseudobulge or nuclearbar accounting for ~15% of the total starlight, which is consistent with thegeneral characteristics of the host of low mass AGNs.

astrophysical journal/the astrophysical journal

Central Engine and Host Galaxy of RXJ 1301.9+2747: A Multiwavelength  View of a Low-mass Black Hole Active Galactic Nuclei with Ultra-soft X-ray  Emission