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Warm Absorbers (WAs), as an important form of AGN outflows, show absorptionin both UV and X-ray band. Using XSTAR generated photoionization models, forthe first time we present a joint fit to the simultaneous observations ofHST/COS and Chandra/HETGS on NGC 3783. A total of five WAs explain well allabsorption features from the AGN outflows, which are spread over a wide rangeof parameters: ionization parameter log{\xi} from 0.6 to 3.8, column densitylog N_H from 19.5 to 22.3 cm^{-2}, velocity v from 380 to 1060 km s^{-1}, andcovering factor from 0.33 to 0.75. Not all the five WAs are consistent inpressure. Two of them are likely different parts of the same absorbing gas, andtwo of the other WAs may be smaller discrete clouds that are blown out from theinner region of the torus at different periods. The five WAs suggest a totalmass outflowing rate within the range of 0.22-4.1 solar mass per year.

Joint Fit of Warm Absorbers in COS & HETG Spectra of NGC 3783