Hanny's Voorwerp: a nuclear starburst in IC2497

Details Hanny's Voorwerp: a nuclear starburst in IC2497 Hanny's Voorwerp: a nuclear starburst in IC2497

2011-01-14

arxiv.org/abs/1101.2784v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Paper presented at the 10th EVN Symposium in Manchester, Sep. 2010

Scientific paper

We present high and intermediate resolution radio observations of the central region in the spiral galaxy IC 2497, performed using the European VLBI Network (EVN) at 18 cm, and the Multi-Element Radio Linked Interferometer Network (MERLIN) at 18 cm and 6 cm. The e-VLBI observations detect two compact radio sources with brightness temperatures in excess of 105 K, suggesting that they are associated with an AGN located at the centre of the galaxy. We show that IC2497 lies on the FIR-radio correlation and that the dominant component of the 18 cm radio flux density of the galaxy is associated with extended emission confined to sub-kpc scales. IC 2497 therefore appears to be a luminous infrared galaxy that exhibits a nuclear starburst with a total star formation rate (assuming a Salpeter IMF) of ~ 70 M*/yr. Typically, vigorous star forming galaxies like IC2497 always show high levels of extinction towards their nuclear regions. The new results are in-line with the hypothesis that the ionisation nebula "Hanny's Voorwerp", located ~15-25 kpc from the galaxy is part of a massive gas reservoir that is ionised by the radiation cone of an AGN that is otherwise obscured along the observer's line-of- sight.

Affiliated with

Also associated with

No associations

Rating

Hanny's Voorwerp: a nuclear starburst in IC2497 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hanny's Voorwerp: a nuclear starburst in IC2497, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hanny's Voorwerp: a nuclear starburst in IC2497 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-79182