Swift/XRT monitoring of the orbital and superorbital modulations in 4U 1909+07

Open Access

Fig. 2.

Left: Swift/XRT hardness ratio of 4U 1909+07 and best-fit parameters as a function of orbital phase (P_orb = 4.4006 ± 0.0006 d, T₀ = MJD 50439.919). The absorption column density N_H is in units of 10²² cm⁻², the power-law photon index is Γ, and the observed 0.3–10 keV flux is in units of 10⁻¹¹ erg cm⁻² s⁻¹). Right: Same as left, but for the superorbital phase (P_sup = 15.196 ± 0.004 d, T₀ = MJD 59502.1).

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