Infrared photometry and spectroscopy of supernova 1986g in NGC 5128-Centaurus A

Details Infrared photometry and spectroscopy of supernova 1986g in NGC 5128-Centaurus A Infrared photometry and spectroscopy of supernova 1986g in NGC 5128-Centaurus A

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l.129f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 15, 1987, p. L129-L134.

Other

82

Blue Stars, Centaurus Constellation, Infrared Photometry, Infrared Spectroscopy, Light Curve, Supernovae, Energy Distribution, Light (Visible Radiation), Statistical Analysis

Scientific paper

Infrared light curves of SN 1986g in NGC 5128 show significant quantitative differences from other Type Ia SN. The colors of SN 1986g are bluer, their variation with time is smaller, and the time scale for variation appears to be shorter. These differences are probably related to the fact that SN 1986g is the first Type Ia SN of β class 12 to have adequate infrared and optical data. Spectroscopy in the 1.0 - 2.4 μm region of SN 1986g is also presented. Two estimates for the distance modulus of NGC 5128 with respect to Virgo, dependent on assumptions about the luminosity of SN 1986g relative to other Type Ia supernovae, are that it is 3.37 or 3.6 mag closer. A more reliable relative distance, based on infrared and optical data, is with respect to NGC 5055; it seems that NGC 5128 is 2.1 mag closer than NGC 5055. The use of Type Ia supernovae as distance indicators via their infrared magnitudes is clearly compromised by these results on SN 1986g.

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