THE DISCOVERY OF THE MOST DISTANT KNOWN TYPE Ia SUPERNOVA AT REDSHIFT 1.914

Journal Article · Fri May 10 00:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/768/2/166· OSTI ID:22126718

Jones, David O.; Rodney, Steven A.; Riess, Adam G. ^[1]; Mobasher, Bahram ^[2]; Dahlen, Tomas; Casertano, Stefano; Koekemoer, Anton ^[3]; McCully, Curtis; Keeton, Charles R.; Patel, Brandon ^[4]; Frederiksen, Teddy F.; Hjorth, Jens ^[5]; Strolger, Louis-Gregory ^[6]; Wiklind, Tommy G. ^[7]; Challis, Peter ^[8]; Graur, Or ^[9]; Hayden, Brian; Garnavich, Peter ^[10]; Weiner, Benjamin J. ^[11]; Filippenko, Alexei V. ^[12] ; others, and

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1. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
2. Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States)
3. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
4. Department of Physics and Astronomy, Rutgers, State University of New Jersey, Piscataway, NJ 08854 (United States)
5. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen (Denmark)
6. Department of Physics, Western Kentucky University, Bowling Green, KY 42101 (United States)
7. Joint ALMA Observatory, ESO, Santiago (Chile)
8. Harvard/Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)
9. School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978 (Israel)
10. Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)
11. Department of Astronomy, University of Arizona, Tucson, AZ 85721 (United States)
12. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)

We present the discovery of a Type Ia supernova (SN) at redshift z = 1.914 from the CANDELS multi-cycle treasury program on the Hubble Space Telescope (HST). This SN was discovered in the infrared using the Wide-Field Camera 3, and it is the highest-redshift Type Ia SN yet observed. We classify this object as a SN Ia by comparing its light curve and spectrum with those of a large sample of Type Ia and core-collapse SNe. Its apparent magnitude is consistent with that expected from the {Lambda}CDM concordance cosmology. We discuss the use of spectral evidence for classification of z > 1.5 SNe Ia using HST grism simulations, finding that spectral data alone can frequently rule out SNe II, but distinguishing between SNe Ia and SNe Ib/c can require prohibitively long exposures. In such cases, a quantitative analysis of the light curve may be necessary for classification. Our photometric and spectroscopic classification methods can aid the determination of SN rates and cosmological parameters from the full high-redshift CANDELS SN sample.

• OSTI ID: 22126718
• Journal Information: Astrophysical Journal, Vol. 768, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CAMERAS
CLASSIFICATION
COMPARATIVE EVALUATIONS
COSMOLOGY
RED SHIFT
SIMULATION
SPACE
SPECTRA
SUPERNOVAE
TELESCOPES