Institution: | Instituto de Física, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre RS, Brazil;Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia;Gemini Observatory and Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA |