English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The third INTEGRAL/IBIS survey has revealed several new hard X-ray sources,which are still unclassified. To identify these sources, we need to find theircounterparts at other wavelengths and then study their nature. The capabilityof XRT on board Swift to localize the sources with a positional accuracy of fewarcseconds allows the search for optical/UV, infrared and radio counterparts tobe more efficient and reliable. We analysed all XRT observations available forthree unidentified INTEGRAL sources, IGR J18249-3243, IGR J19443+2117 and IGRJ22292+6647, localized their soft X-ray counterparts and searched forassociations with objects in the radio band. We also combined X-/gamma-raydata, as well as all the available radio, infrared and optical/UV information,in order to provide a broad-band spectral characterization of each source andinvestigate its nature. All three sources are found to be bright and repeatedlyobserved radio objects, although poorly studied. The X-/gamma-ray spectrum ofeach source is well described by power laws with photon indices typical of AGN;only IGR J19443+2117 may have absorption in excess of the Galactic value, whileIGR J22292+6647 is certainly variable at X-ray energies. IGR J18249-3243 has acomplex radio morphology and a steep radio spectrum; the other two sources showflatter radio spectra and a more compact morphology. Overall, their radio,optical/UV and infrared characteristics, as well as their X-/gamma-rayproperties, point to an AGN classification for all three objects.

The AGN nature of three INTEGRAL sources: IGR J18249-3243, IGR J19443+2117 and IGR J22292+6647