What excites the optical emission in X-ray-selected galaxies?

Open Access

Fig. 4.

Distribution of 1347 SDSS X-ray-selected galaxies in terms of hardness ratio, HR1-HR4, according to data from the XMM-Newton catalogue. $HRn = \frac{B_{n + 1} - B_{n}}{B_{n + 1} + B_{n}}$ $\mathrm{HRn}=\frac{B_{n+1}-B_n}{B_{n+1}+B_n}$ , where B denotes the count rates in energy band n, and n takes a value from 1 to 4.

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