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26 April 2024 |
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The Farthest Known Supernova: Support for an Accelerating Universe and a Glimpse of the Epoch of Deceleration | | Adam G. Riess
; Peter E. Nugent
; Brian P. Schmidt
; John Tonry
; Mark Dickinson
; Ronald L. Gilliland
; Rodger I. Thompson
; Tamas Budavari
; Stefano Casertano
; Aaron S. Evans
; Alexei V. Filippenko
; Mario Livio
; David B. Sanders
; Alice E. Shapley
; Hyron Spinrad
; Charles C. Steidel
; Daniel Stern
; Jason Surace
; Sylvain Veilleux
; | | Date: |
27 Apr 2001 | | Journal: | Astrophys.J. 560 (2001) 49-71 | | Subject: | astro-ph | | Abstract: | We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. SN 1997ff, was discovered in a repeat observation by the HST of the HDF-), and serendipitously monitored with NICMOS on HST throughout the GTO campaign. The SN type can be determined from the host galaxy type:an evolved, red elliptical lacking enough recent star formation to provide a significant population of core-collapse SNe. The class- ification is further supported by diagnostics available from the observed colors and temporal behavior of the SN, both of which match a typical SN Ia. The photo- metric record of the SN includes a dozen flux measurements in the I, J, and H bands spanning 35 days in the observed frame. The redshift derived from the SN photometry, z=1.7+/-0.1, is in excellent agreement with the redshift estimate of z=1.65+/-0.15 derived from the U_300,B_450,V_606,I_814,J_110,J_125,H_160, H_165,K_s photometry of the galaxy. Optical and near-infrared spectra of the host provide a very tentative spectroscopic redshift of 1.755. Fits to observations of the SN provide constraints for the redshift-distance relation of SNe~Ia and a powerful test of the current accelerating Universe hypothesis. The apparent SN brightness is consistent with that expected in the decelerating phase of the preferred cosmological model, Omega_M~1/3, Omega_Lambda~2/3. It is inconsistent with grey dust or simple luminosity evolution, candidate astro- physical effects which could mimic past evidence for an accelerating Universe from SNe Ia at z~0.5.We consider several sources of possible systematic error including lensing, SN misclassification, selection bias, and calibration errors. Currently, none of these effects appears likely to challenge our conclusions. | | Source: | arXiv, astro-ph/0104455 | | Services: | Forum | Review | PDF | Favorites | |
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