期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
卷 121, 期 885, 页码 1279-1290出版社
IOP PUBLISHING LTD
DOI: 10.1086/648535
关键词
-
资金
- Smithsonian Institution Endowment Funds
- NASA [NNX08AH32G, NNX08AJ55G]
- NSF [AST0805832]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0805832] Funding Source: National Science Foundation
- NASA [101471, NNX08AJ55G, 100967, NNX08AH32G] Funding Source: Federal RePORTER
We present an empirical model of Comptonization for fitting the spectra of X-ray binaries. This model, named SIMPL, has been developed as a package implemented in XSPEC. With only two free parameters, SIMPL is competitive as the simplest model of Compton scattering. Unlike the pervasive standard power-law model, SIMPL incorporates the basic features of Compton scattering of soft photons by energetic coronal electrons. Using a simulated spectrum, we demonstrate that SIMPL closely matches the behavior of physical Comptonization models that consider the effects of optical depth, coronal electron temperature, and geometry. We present fits to RXTE spectra of the black hole transient H1743-322 and a BeppoSAX spectrum of LMC X-3 using both SIMPL and the standard power-law model. A comparison of the results shows that SIMPL gives equally good fits, while eliminating the troublesome divergence of the standard power-law model at low energies. SIMPL is completely flexible and can be used self-consistently with any seed spectrum of photons. We show an example of how SIMPL-unlike the standard power law-teamed up with DISKBB (the standard model of disk accretion) provides a uniform disk normalization that is unaffected by moderate Comptonization.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据