1. A TYPE Ia SUPERNOVA AT REDSHIFT 1.55 IN HUBBLE SPACE TELESCOPE INFRARED OBSERVATIONS FROM CANDELS.
- Author
-
Rodney, Steven A., Riess, Adam G., Dahlen, Tomas, Strolger, Louis-Gregory, Ferguson, Henry C., Hjorth, Jens, Frederiksen, Teddy F., Weiner, Benjamin J., Mobasher, Bahram, Casertano, Stefano, Jones, David O., Challis, Peter, Faber, S. M., Filippenko, Alexei V., Garnavich, Peter, Graur, Or, Grogin, Norman A., Hayden, Brian, Jha, Saurabh W., and Kirshner, Robert P.
- Subjects
TYPE I supernovae ,REDSHIFT ,ASTRONOMICAL spectroscopy ,ASTRONOMY - Abstract
We report the discovery of a Type la supernova (SN Ia) at redshift z = 1.55 with the infrared detector of the Wide Field Camera 3 (WFC3-IR) on the Hubble Space Telescope (HST). This object was discovered in CANDELS imaging data of the Hubble Ultra Deep Field and followed as part of the CANDELS+CLASH Supernova project, comprising the SN search components from those two HST multi-cycle treasury programs. This is the highest redshift SN Ia with direct spectroscopic evidence for classification. It is also the first SN Ia at z > 1 found and followed in the infrared, providing a full light curve in rest-frame optical bands. The classification and redshift are securely defined from a combination of multi-band and multi-epoch photometry of the SN, ground-based spectroscopy of the host galaxy, and WFC3-IR grism spectroscopy of both the SN and host. This object is the first of a projected sample at z > 1.5 that will be discovered by the CANDELS and CLASH programs. The full CANDELS+CLASH SN Ia sample will enable unique tests for evolutionary effects that could arise due to differences in SN Ia progenitor systems as a function of redshift. This high-z sample will also allow measurement of the SN Ia rate out to z ≈ 2, providing a complementary constraint on SN Ia progenitor models. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF