Deep Near-Infrared Imaging and Photometry of the Antennae Galaxies with WIRC
Hayward, T. L.; Houck, J. R.; Brandl, B. R.; Eikenberry, S. S.; Carson, J. C.; Clark, D. M.; Wilson, J. C.; Henderson, C. P.; Barry, D. J.
Netherlands, United States, Chile
Abstract
We present deep near-infrared images of the Antennae galaxies, taken with the Palomar Wide-Field Infrared Camera (WIRC). The images cover a 4.33 arcmin ×4.33 arcmin (24.7×24.7 kpc) area around the galaxy interaction zone. We derive J- and Ks-band photometric fluxes for 172 infrared star clusters and discuss details of the two galactic nuclei and the overlap region. We also discuss the properties of a subset of 27 sources that have been detected with WIRC, HST, and the VLA. The sources in common are young clusters of less than 10 Myr, which show no correlation between their infrared colors and 6 cm radio properties. These clusters cover a wide range in infrared color due to extinction and evolution. The average extinction is about AV~2 mag, while the reddest clusters may be reddened by up to 10 mag.