ChIcAGO: Chasing the Identification of ASCA Galactic Objects

Computer Science

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Galactic, Atca

Scientific paper

X-ray sources in the Galactic plane represent a variety of exotic populations. Surprisingly, most bright low-latitude X-ray sources are still unidentified, but presumably correspond to some mixed population of young stars, high mass X-ray binaries, magnetars, pulsars, and supernova remnants. To derive the birth-rates, lifetimes and distributions of these populations, we have obtained a substantial allocation of time with the Chandra X-ray Observatory, with which we are carrying out short observations of all the unidentified objects in the ASCA Galactic Plane Survey. These observations are providing arcsecond localisations for each source, which then enable the archival searches and multi-wavelength follow-up that are the key to identification. Here we propose for short multi-frequency ATCA observations of unresolved Chandra X-ray sources that are coincident with diffuse, confusing radio emission. By obtaining high resolution radio observations of these regions it will be possible to resolve out the diffuse emission and search for unresolved radio counterparts. The resulting information on fluxes, spectra, morphology and polarisation will provide critical information on the underlying nature of each object. When the overall survey is completed, these identifications will provide a new understanding of Galactic X-ray sources.

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