Is an obscured AGN at the centre of the disk galaxy IC 2497 responsible for Hanny's Voorwerp?

Details Is an obscured AGN at the centre of the disk galaxy IC 2497 responsible for Hanny's Voorwerp? Is an obscured AGN at the centre of the disk galaxy IC 2497 responsible for Hanny's Voorwerp?

2009-09-16

arxiv.org/abs/0909.3038v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Presented at The 8th International e-VLBI Workshop: the Science and Technology of Long Baseline Real-Time Interferometry, EXPR

Scientific paper

We present the results of VLBI and MERLIN observations of the massive disk galaxy IC 2497. Optical observations of IC 2497 revealed the existence of a giant emission nebula "Hanny's Voorwerp" in the proximity of the galaxy. Earlier short-track 18 cm observations with e-VLBI at 18 cm, detected a compact radio component (C1) at the centre of IC 2497. The brightness temperature of C1 was measured to be greater than 4E5 K. Deeper, long-track e-VLBI observations presented here, re-confirm the existence of C1 but also reveal the existence of a second compact component (C2) located about 230 milliarcseconds to the North-East of C1. The brightness temperature of C2 is measured to be greater than 1.4E5 K, suggesting that both components may be related to AGN activity (e.g. a radio core and jet hotspot). Lower resolution 18cm MERLIN observations show both components. C1 is shown to be compact with a slight elongation along the direction of Hanny's Voorwerp, and C2 shows a lot of extended emission in an almost perpendicular direction to the direction of the Voorwerp. Our results continue to support the hypothesis that IC 2497 contains an Active Galactic Nucleus (AGN), and that a jet associated with this AGN clears a path that permits ionising radiation from the AGN to directly illuminate the emission nebula.

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