GPU-accelerated X-ray pulse profile modeling | Astronomy & Astrophysics (A&A)

Open Access

Fig. 1

Demonstration of the geometric setup used in our X-ray PPM forward computation, shown in the lab-frame coordinate system $\hat{x} - \hat{y} = \hat{z}$ $Mathematical equation: $\hat x - \hat y = \hat z$$ . A surface patch (orange square) on the stellar surface at colatitude θ and rotational phase ϕ, viewed along the observer’s line-of-sight unit vector, $\hat{k}$ $Mathematical equation: ${\hat k}$$ . Definitions of all unit vectors are given in Table 1 and angle conventions are summarized in Table 2.

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