The nature of the ASCA/INTEGRAL source AX J183039-1002: a new Compton-thick AGN?

Bassani, L., Landi, R., Campana, R., McBride, V.A., Dean, A.J., Bird, A.J., Green, D.A., Ubertini, P. and De Rosa, A. (2009) The nature of the ASCA/INTEGRAL source AX J183039-1002: a new Compton-thick AGN? Monthly Notices of the Royal Astronomical Society: Letters, 395 (1), L1-L5. (doi:10.1111/j.1745-3933.2009.00626.x).

Abstract

We report on the identification of the X/soft γ-ray source AX J183039–1002 detected with ASCA and INTEGRAL/IBIS. The source, which has an observed 20–100 keV flux of ~8.6 × 10^-11 erg cm^-2 s^-1 , is inside a diffuse radio supernova remnant (SNR) and is spatially coincident with a compact radio source. We analysed archival Chandra and XMM–Newton observations in order to identify the ASCA/INTEGRAL source. A point-like Chandra X-ray object was found to be positionally coincident with the compact radio source and within the error circle of the ASCA and INTEGRAL sources. Although the association of a compact radio/X-ray source with a radio SNR could be indicative of a pulsar wind nebula (PWN), the XMM–Newton X-ray spectrum is compatible with an absorbed, Seyfert-2 like active galactic nucleus, since it provides evidence for an iron emission line of ~1 keV equivalent width; furthermore the X-ray source spectrum is similar to that of other Compton thick AGN where the ≤2 keV data are associated to a warm reflector and the 10 keV one to a cold reflector.

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Contributors

Author: A.J. Bird

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