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Table 9.

Investigation of a narrow absorption feature in RGS1 data.

obsida S/N kT EW1 ϵ2 σ2 EW2

(eV)
(A) 45 < 5 8
(B) 40 70 < 3
(C) 40 70 < 1.2
(D) 50 < 100 < 2.1
2012 50 < 10 2.6
201 90 < 60 < 9
301 65 50 < 4
401 60 < 50 < 560 < 10 2.4
501 60 30 < 9

Old 90 70 575(4) 3
New 150 93(3) 35 < 560 4

Notes. Errors are 1σ confidence levels. The model fitted to the data in XSPEC is tbabs(bbody-gauss-gauss). The subscripts “1” and “2” in the labels refer to the properties of the broad and narrow features, respectively. The energy, ϵ1 = 410 eV, and FWHM, σ1 = 100 eV, of the broad absorption feature, and the hydrogen column density, NH = 2.4 × 1020 cm−2, are held fixed during spectral fitting. The chi-squared values are within χ2 ∼ 25−50, for 76 degrees of freedom (NHP ∼100%).

(a)

The observations are labelled as in Tables 1 and 2.

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