Locate the ‘Tadpole’ Galaxies

Among the thousands of galaxies in this image of the Hubble Ultra Deep Field are the 36 so-called "tadpole" galaxies identified recently by astronomers. The green squares mark these galaxies, which existed billions of years ago. They are called tadpoles because of their distinct knot-and-tail shapes, which suggest that they are engaging in galactic mergers.

About the colours

Blue: F435W (B) Green: F606W (V), F775W (i) Red: F850LP (z)

About the data

This image of the HUDF was created from HST data from the following proposal: 9978 : S. Beckwith, S. Malhotra, M. Giavalisco, N. Panagia, J. Rhoads, M. Stiavelli, R. Somerville, S. Casertano, B. Margon, C. Blades, J. Caldwell, and M. Clampin (STScI), M. Corbin (CSC), M. Dickinson, H. Ferguson, and A. Fruchter (STScI), R. Hook (STScI/ECF), S. Jogee, A. Koekemoer, R. Lucas, M. Sosey, and L. Bergeron (STScI).

The science team includes: A.N. Straughn, S.H. Cohen, R.E. Ryan Jr, N.P. Hathi, R.A. Windhorst, & R.A. Jansen (Arizona State University), A.M. Koekemoer, N. Pirzkal, C. Xu, B. Mobasher, S. Malhotra, L.-G.Strolger, and J.E. Rhoads (STScI).