Spectra of Hydrogen-poor Superluminous Supernovae from the Palomar Transient Factory

Robert M. Quimby, Annalisa De Cia, Avishay Gal-Yam, Giorgos Leloudas, Ragnhild Lunnan, Daniel A. Perley, Paul M. Vreeswijk, Lin Yan, Joshua S. Bloom, S. Bradley Cenko, Jeff Cooke, Richard Ellis, Alexei V. Filippenko, Mansi M. Kasliwal, Io K. W. Kleiser, Shrinivas R. Kulkarni, Thomas Matheson, Peter E. Nugent, Yen-Chen Pan, Jeffrey M. SilvermanAssaf Sternberg, Mark Sullivan, Ofer Yaron