Free Access

Table 2

Fitted parameters for the PN X-ray continuum spectrum in Fig. 3.

Component Parameter 3PLa 2PL+bbb

Hard NH (1022 cm-2) 60  ±  4
Photon indexc
Normalizationd 93  ±  9
Scattered NH (1022 cm-2)
Normalizationd 43  ±  3
Soft NH (1022 cm-2) 0.74  ±  0.04
Normalizationd ···   
kTbb (keV) ···   
Normalizationbb ···   
(d.o.f.) 1.16(2235) 1.16(2234)



Three absorbed power laws;


two absorbed power laws plus an absorbed blackbody;


the same for all the power laws;


(× 10-4) in units of photons s-1 cm-2 keV-1 at 1 keV.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.