SN 2006gy: An extremely luminous supernova in the galaxy NGC 1260

Abstract

With an extinction-corrected V-band peak absolute magnitude of about -22, supernova (SN) 2006gy is probably the brightest SN ever observed. We report on multi-wavelength observations of this SN and its environment. Our spectroscopy shows an H alpha emission line as well as absorption features which may be identified as SiII lines at low expansion velocity. The high peak luminosity, the slow rise to maximum, and the narrow H alpha line are similar to those observed in hybrid type-Ia/IIn (also called IIa) SNe. The host galaxy, NGC 1260, is dominated by an old stellar population with solar metallicity. However, our high resolution adaptive optics images reveal a dust lane in this galaxy, and there appears to be an HII region in the vicinity of the SN. The extra-ordinarily large peak luminosity, ~3x10^44 erg/s, demands a dense circum-stellar medium, regardless of the mass of the progenitor star. The inferred mass loss rate of the progenitor is ~0.1 solar mass per year over a period of ~10 yr prior to explosion. Such an high mass-loss rate may be the result of a binary star common envelope ejection. The total radiated energy in the first two months is about 1.1x10^51 erg, which is only a factor of two less than that available from a super-Chandrasekhar Ia explosion. Therefore, given the presence of a star forming region in the vicinity of the SN and the high energy requirements, a plausible scenario is that SN 2006gy is related to the death of a massive star (e.g., pair production SN).

arXiv comment4 pages, ApJL, submitted

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