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A shrinking Compact Symmetric Object: J11584+2450?

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arxiv 0806.3955 v1 pith:RWVZIVNJ submitted 2008-06-24 astro-ph

A shrinking Compact Symmetric Object: J11584+2450?

classification astro-ph
keywords j11584compactdataobjectobservationsphysicalsymmetricactually
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We present multi-frequency multi-epoch Very Long Baseline Array (VLBA) observations of J11584+2450. These observations clearly show this source, previously classified as a core-jet, to be a compact symmetric object (CSO). Comparisons between these new data and data taken over the last 9 years shows the edge brightened hot spots retreating towards the core (and slightly to the west) at approximately 0.3c. Whether this motion is strictly apparent or actually physical in nature is discussed, as well as possible explanations, and what implications a physical contraction of J11584+2450 would have for current CSO models.

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