Chandra observations of NGC4698: a Seyfert-2 with no absorption

Details Chandra observations of NGC4698: a Seyfert-2 with no absorption Chandra observations of NGC4698: a Seyfert-2 with no absorption

2003-05-26

arxiv.org/abs/astro-ph/0305488v1

Astrophys.J.594:704-708,2003

Astronomy and Astrophysics

Astrophysics

12 pages, to appear in ApJ

Scientific paper

10.1086/377120

We present Chandra ACIS-S observations of the enigmatic Seyfert-2 galaxy NGC4698. This object together with several other bona-fide Seyfert-2 galaxies show no absorption in the low spatial resolution ASCA data, in contrast to the standard unification models. Our Chandra observations of NGC4698 probe directly the nucleus allowing us to check whether nearby sources contaminate the ASCA spectrum. Indeed, the Chandra observations show that the ASCA spectrum is dominated by two nearby AGN. The X-ray flux of NGC4698 is dominated by a nuclear source with luminosity L(0.3-8 keV) ~ 10^39, erg s-1 coincident with the radio nucleus. Its spectrum is well represented by a power-law, ~ 2.2, obscured by a small column density of 5x10^20 cm-2 suggesting that NGC4698 is an atypical Seyfert galaxy. On the basis of its low luminosity we then interpret NGC4698 as a Seyfert galaxy which lacks a broad-line region.

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