An X-Ray Absorption Feature in the BL Lacertae Object H1426+428

Details An X-Ray Absorption Feature in the BL Lacertae Object H1426+428 An X-Ray Absorption Feature in the BL Lacertae Object H1426+428

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..774s&link_type=abstract

Astrophysical Journal v.483, p.774

Astronomy and Astrophysics

Astronomy

29

Line: Identification, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: H1426+428, Radiation Mechanisms: Nonthermal, X-Rays: Galaxies

Scientific paper

We report the presence of an absorption feature in the X-ray spectrum of the BL Lacertae object H1426+428 (z = 0.129). H1426+428 was observed at three separate epochs with BBXRT, ROSAT, and ASCA. In the BBXRT spectrum an absorption feature is clearly present at ~0.66 keV, consistent with absorption by highly ionized oxygen. The phenomenological model that best describes the absorption feature is an inverted Gaussian with width FWHM <~ 43,000 km s-1. This feature is not present in the ROSAT and ASCA data, both taken when the source flux was fainter by a factor ~2. Instead, these data show some evidence for absorption edge(s) at lower energies. These results are consistent with partially ionized, low-density gas surrounding the central engine of H1426+428. As a first approximation the X-ray continuum can be described with a power law with photon index Gamma ~ 2. The BBXRT and ASCA data are better fitted with a convex (downward-curved) broken power law. The exact shape of the continuum depends on the assumed profile for the absorption feature. We show that, using a specific warm absorber to fit the data, there is no need for a continuum model more complex than a single power law.

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