| Affiliation: | Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AW;Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101, USA;Laboratory for Astronomy and Solar Physics, Code 681, NASA's Goddard Space Flight Center, Greenbelt, MD 20771, USA;Laboratory for High Energy Astrophysics, Code 660, NASA's Goddard Space Flight Center, Greenbelt, MD 20771, USA;California Institute of Technology, Pasadena, CA 91125, USA;Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA |
