Search Publications

Powerful CMD: a tool for color-magnitude diagram studies

Fan, Zhou; Chen, Li; Li, Zhong-Mu +5 more

We present a new tool for color-magnitude diagram (CMD) studies, Powerful CMD. This tool is built based on the advanced stellar population synthesis (ASPS) model, in which single stars, binary stars, rotating stars and star formation history have been taken into account. Via Powerful CMD, the distance modulus, color excess, metallicity, age, binar…

How to co-add images? I. A new iterative method for image reconstruction of dithered observations

Wang, Lei; Li, Guo-Liang

By employing the previous Voronoi approach and replacing its nearest neighbor approximation with Drizzle in iterative signal extraction, we develop a fast iterative Drizzle algorithm, named fiDrizzle, to reconstruct the underlying band-limited image from undersampled dithered frames. Compared with the existing iDrizzle, the new algorithm improves …

Joint fit of Warm Absorbers in COS and HETG spectra of NGC 3783

Sun, Wei; Ji, Li; Fu, Xiao-Dan +2 more

Warm Absorbers (WAs), as an important form of AGN outflows, show absorption in both the UV and X-ray bands. Using XSTAR generated photoionization models, for the first time we present a joint fit to the simultaneous observations of HST/COS and Chandra/HETG on NGC 3783. A total of five WAs explain well all absorption features from the AGN outflows,…