On the Hidden Nuclear Starburst in Arp 220

Details On the Hidden Nuclear Starburst in Arp 220 On the Hidden Nuclear Starburst in Arp 220

2000-11-25

arxiv.org/abs/astro-ph/0011467v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, Accepted for publication in ApJL

Scientific paper

10.1086/318925

We construct a starburst model for the hidden starbursts in Arp 220 based on the new Starburst99 models of Leitherer et al. Comparing these stellar population synthesis models with observations, we show that the hidden power source must be due to star formation (as opposed to an AGN) at the 50% level or more in order to avoid an ionizing photon excess problem, and this starburst must be young ($< 7 \times 10^7$ yr). We derive a current star formation rate of $270 M_{\odot}$ yr$^{-1}$, and an extinction $A_V > 30$ mag for our line of sight to this hidden starburst.

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