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TOPIC: CANDELS+CLASH Supernova project

Blobrana

L

Posts: 131433

Date: Jan 19 22:27 2014

CLASH	Permalink

Title: Detecting Ancient Supernovae at z ~ 5 - 12 with CLASH Author: Daniel J. Whalen, Joseph Smidt, Jarrett L. Johnson, Daniel E. Holz, Massimo Stiavelli, Chris L. Fryer Supernovae are important probes of the properties of stars at high redshifts because they can be detected at early epochs and their masses can be inferred from their light curves. Finding the first cosmic explosions in the universe will only be possible with the James Webb Space Telescope, the Wide-Field Infrared Survey Telescope and the next generation of extremely large telescopes. But strong gravitational lensing by massive clusters, like those in the Cluster Lensing and Supernova Survey with Hubble (CLASH), could reveal such events now by magnifying their flux by factors of 10 or more. We find that CLASH will likely discover at least 2 - 3 core-collapse supernovae at 5 < z < 12 and perhaps as many as ten. Future surveys of cluster lenses similar in scope to CLASH by the James Webb Space Telescope might find hundreds of these events out to z ~ 15 - 17. Besides revealing the masses of early stars, these ancient supernovae will also constrain cosmic star formation rates in the era of first galaxy formation. Read more (174kb, PDF) __________________

Blobrana

L

Posts: 131433

Date: Jan 13 02:34 2012

CANDELS+CLASH Supernova project	Permalink

Title: A Type Ia Supernova at Redshift 1.55 in Hubble Space Telescope Infrared Observations from CANDELS Authors: Steven A. Rodney, Adam G. Riess, Tomas Dahlen, Louis-Gregory Strolger, Henry C. Ferguson, Jens Hjorth, Teddy F. Frederiksen, Benjamin J. Weiner, Bahram Mobasher, Stefano Casertano, David O. Jones, Peter Challis, S. M. Faber, Alexei V. Filippenko, Peter Garnavich, Or Graur, Norman A. Grogin, Brian Hayden, Saurabh W. Jha, Robert P. Kirshner, Dale Kocevski, Anton Koekemoer, Curtis McCully, Brandon Patel, Abhijith Rajan, Claudia Scarlata We report the discovery of a Type Ia supernova (SNIa) 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 SNIa 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. Read more (5446kb, PDF) __________________

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