Supernova 1992bi in Anonymous Galaxy
Abstract
C. Pennypacker, S. Perlmutter, G. Goldhaber, A. Goobar, J. Desai, A. Kim, M. Kim, R. Muller, H. Newberg, and I. Small, Lawrence Berkeley Laboratory and the Center for Particle Astrophysics, Berkeley; B. Boyle and R. McMahon, Institute of Astronomy, Cambridge; P. Bunclark, D. Carter, M. Irwin, and R. Terlevich, Royal Greenwich Observatory; R. Ellis, University of Durham; and W. Couch, University of New South Wales, report the detection of a supernova with the Isaac Newton 2.5-m telescope during a search for high-redshift supernovae. The supernova is at R.A. = 16h08m28s.40, Decl. = +39 54'57".7 (equinox 1950.0), and is 1".5 east and 0".5 north of the core of the host galaxy. The supernova was discovered at magnitude R = 22 on an Apr. 21 image, and then confirmed on images from Apr. 24, 28, May 2, 7, 9, and 11. Two previous reference images from Mar. 25 and 27, and later follow-up images on June 10 (T. Small and J. Mould, Palomar 5-m reflector), July 6 (C. Crawford and R. Abraham, Isaac Newton telescope), and Aug. 21 and 22, all show no supernova to a limit of mag about 24. The photometry points and upper limits indicate SN 1992bi to be a type-Ia supernova, with an implied redshift of about 0.45. On Aug. 21, the spectrum of the host galaxy was observed at the William Herschel 4.2-m telescope by K. Glazebrook (Durham) and the redshift measured to be 0.457.
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- November 1992
- Bibcode:
- 1992IAUC.5652....1P