Extragalactic sources towards the central region of the Galaxy

Details Extragalactic sources towards the central region of the Galaxy Extragalactic sources towards the central region of the Galaxy

2007-12-03

arxiv.org/abs/0712.0258v1

Mon.Not.Roy.Astron.Soc.360:1305,2005

Astronomy and Astrophysics

Astrophysics

24 pages, 67 figures, published earlier in MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09107.x

We have observed a sample of 64 small diameter sources towards the central -6 degree < l< 6 degree, -2 degree < b < 2 degree of the Galaxy with the aim of studying the Faraday rotation measure near the Galactic Centre (GC) region. All the sources were observed at 6 and 3.6 cm wavelengths using the ATCA and the VLA. Fifty nine of these sources are inferred to be extragalactic. The observations presented here constitute the first systematic study of the radio polarisation properties of the background sources towards this direction and increases the number of known extragalactic radio sources in this part of the sky by almost an order of magnitude. Based on the morphology, spectral indices and lack of polarised emission, we identify four Galactic HII regions in the sample.

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